Sync with master

.gitignore

@@ -10,6 +10,8 @@ build/
 *.so.*
 *.dylib
 *.dll
+*.lib
+*.exp
 *.pyd
 *_dsoinfo.py
 

MANIFEST.in

@@ -3,7 +3,7 @@ include golang/libgolang.h
 include golang/runtime/libgolang.cpp
 include golang/runtime/libpyxruntime.cpp
 include golang/pyx/runtime.h
-include golang/pyx/runtime.cpp
+include golang/pyx/testprog/golang_dso_user/dsouser/dso.h
 include golang/pyx/testprog/golang_dso_user/dsouser/dso.cpp
 include golang/runtime/internal.h
 include golang/runtime/internal/atomic.h
@@ -34,6 +34,9 @@ include golang/sync_test.cpp
 include golang/time.h
 include golang/time.cpp
 include golang/_testing.h
+include golang/_compat/windows/strings.h
+include golang/_compat/windows/unistd.h
 recursive-include golang    *.py *.pxd *.pyx *.toml *.txt*
 recursive-include gpython   *.py
 recursive-include 3rdparty  *.h
+recursive-exclude golang    *_dsoinfo.py

golang/__init__.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018-2022  Nexedi SA and Contributors.
+# Copyright (C) 2018-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -42,6 +42,9 @@ from golang._gopath import gimport  # make gimport available from golang
 import inspect, sys
 import decorator, six
 
+import setuptools_dso
+setuptools_dso.dylink_prepare_dso('golang.runtime.libgolang')
+
 from golang._golang import _pysys_exc_clear as _sys_exc_clear
 
 # @func is a necessary decorator for functions for selected golang features to work.

golang/_compat/windows/strings.h

+#ifndef _NXD_LIBGOLANG_COMPAT_WIN_STRINGS_H
+#define _NXD_LIBGOLANG_COMPAT_WIN_STRINGS_H
+//
+// Copyright (C) 2023  Nexedi SA and Contributors.
+//                     Kirill Smelkov <kirr@nexedi.com>
+//
+// This program is free software: you can Use, Study, Modify and Redistribute
+// it under the terms of the GNU General Public License version 3, or (at your
+// option) any later version, as published by the Free Software Foundation.
+//
+// You can also Link and Combine this program with other software covered by
+// the terms of any of the Free Software licenses or any of the Open Source
+// Initiative approved licenses and Convey the resulting work. Corresponding
+// source of such a combination shall include the source code for all other
+// software used.
+//
+// This program is distributed WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+// See COPYING file for full licensing terms.
+// See https://www.nexedi.com/licensing for rationale and options.
+
+#include <string.h>
+
+static inline void bzero(void *p, size_t n) {
+    memset(p, '\0', n);
+}
+
+#endif  // _NXD_LIBGOLANG_COMPAT_WIN_STRINGS_H
+

golang/_compat/windows/unistd.h

+#ifndef _NXD_LIBGOLANG_COMPAT_WIN_UNISTD_H
+#define _NXD_LIBGOLANG_COMPAT_WIN_UNISTD_H
+//
+// Copyright (C) 2023  Nexedi SA and Contributors.
+//                     Kirill Smelkov <kirr@nexedi.com>
+//
+// This program is free software: you can Use, Study, Modify and Redistribute
+// it under the terms of the GNU General Public License version 3, or (at your
+// option) any later version, as published by the Free Software Foundation.
+//
+// You can also Link and Combine this program with other software covered by
+// the terms of any of the Free Software licenses or any of the Open Source
+// Initiative approved licenses and Convey the resulting work. Corresponding
+// source of such a combination shall include the source code for all other
+// software used.
+//
+// This program is distributed WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+// See COPYING file for full licensing terms.
+// See https://www.nexedi.com/licensing for rationale and options.
+
+// stub unistd.h to be used on Windows where it is absent.
+// we need this because e.g. `cimport posix.stat` forces inclusion of unistd.h
+// even if we use part of posix.stat that is available everywhere.
+
+#include <io.h>
+
+#define O_CLOEXEC  _O_NOINHERIT
+
+#endif  // _NXD_LIBGOLANG_COMPAT_WIN_UNISTD_H

golang/_golang.pyx

@@ -5,7 +5,7 @@
 # distutils: language = c++
 # distutils: depends = libgolang.h os/signal.h _golang_str.pyx
 #
-# Copyright (C) 2018-2022  Nexedi SA and Contributors.
+# Copyright (C) 2018-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -469,7 +469,7 @@ def pyselect(*pycasev):
                 casev[i].user = pych.dtype
 
         with nogil:
-            selected = _chanselect_pyexc(&casev[0], casev.size())
+            selected = _chanselect_pyexc(casev.data(), casev.size())
 
     finally:
         # decref not sent tx (see ^^^ send prepare)

golang/fmt.cpp

-// Copyright (C) 2019-2020  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -48,7 +48,7 @@ string _vsprintf(const char *format, va_list argp) {
     return string(buf.get(), buf.get() + nchar); // without trailing '\0'
 }
 
-string sprintf(const string &format, ...) {
+string sprintf(const string format, ...) {
     va_list argp;
     va_start(argp, format);
     string str = fmt::_vsprintf(format.c_str(), argp);
@@ -64,7 +64,7 @@ string sprintf(const char *format, ...) {
     return str;
 }
 
-error ___errorf(const string &format, ...) {
+error ___errorf(const string format, ...) {
     va_list argp;
     va_start(argp, format);
     error err = errors::New(fmt::_vsprintf(format.c_str(), argp));

golang/fmt.h

 #ifndef _NXD_LIBGOLANG_FMT_H
 #define _NXD_LIBGOLANG_FMT_H
 
-// Copyright (C) 2019-2020  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -40,7 +40,7 @@ namespace golang {
 namespace fmt {
 
 // sprintf formats text into string.
-LIBGOLANG_API string sprintf(const string &format, ...);
+LIBGOLANG_API string sprintf(const string format, ...);
 
 
 // intseq<i1, i2, ...> and intrange<n> are used by errorf to handle %w.
@@ -75,7 +75,7 @@ namespace {
 //
 // format suffix ": %w" is additionally handled as in Go with
 // `errorf("... : %w", ..., err)` creating error that can be unwrapped back to err.
-LIBGOLANG_API error ___errorf(const string& format, ...);
+LIBGOLANG_API error ___errorf(const string format, ...);
 LIBGOLANG_API error ___errorfTryWrap(const string& format, error last_err, ...);
 LIBGOLANG_API string ___error_str(error err);
 
@@ -111,7 +111,10 @@ inline error errorf(const string& format, Argv... argv) {
 // `const char *` overloads just to catch format mistakes as
 // __attribute__(format) does not work with std::string.
 LIBGOLANG_API string sprintf(const char *format, ...)
-                                __attribute__ ((format (printf, 1, 2)));
+#ifndef _MSC_VER
+                                __attribute__ ((format (printf, 1, 2)))
+#endif
+	;
 
 // cannot use __attribute__(format) for errorf as we add %w handling.
 // still `const char *` overload is useful for performance.

golang/golang_test.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018-2022  Nexedi SA and Contributors.
+# Copyright (C) 2018-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -23,14 +23,14 @@ from __future__ import print_function, absolute_import
 from golang import go, chan, select, default, nilchan, _PanicError, func, panic, \
         defer, recover, u
 from golang import sync
-from pytest import raises, mark, fail
+from pytest import raises, mark, fail, skip
 from _pytest._code import Traceback
 from os.path import dirname
 import os, sys, inspect, importlib, traceback, doctest
 from subprocess import Popen, PIPE
 import six
 from six.moves import range as xrange
-import gc, weakref, warnings
+import gc, weakref
 import re
 
 from golang import _golang_test
@@ -1559,6 +1559,7 @@ RuntimeError: gamma
 Traceback (most recent call last):
   File "PYGOLANG/golang/__init__.py", line ..., in _
     return f(*argv, **kw)
+           ^^^^^^^^^^^^^^                                       +PY311
   File "PYGOLANG/golang/golang_test.py", line ..., in caller
     raise RuntimeError("ccc")
 RuntimeError: ccc
@@ -1579,9 +1580,11 @@ Traceback (most recent call last):
     caller()
   ...
   File "PYGOLANG/golang/__init__.py", line ..., in _
-    return f(*argv, **kw)
+    return f(*argv, **kw)                                       -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
-    d()
+    d()                                                         -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
     d()
   File "PYGOLANG/golang/golang_test.py", line ..., in q1
@@ -1596,9 +1599,11 @@ Traceback (most recent call last):
     caller()
   ...
   File "PYGOLANG/golang/__init__.py", line ..., in _
-    return f(*argv, **kw)
+    return f(*argv, **kw)                                       -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
-    d()
+    d()                                                         -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
     d()
   File "PYGOLANG/golang/golang_test.py", line ..., in q1
@@ -1611,6 +1616,7 @@ RuntimeError: aaa
 Traceback (most recent call last):
   File "PYGOLANG/golang/__init__.py", line ..., in _
     return f(*argv, **kw)
+           ^^^^^^^^^^^^^^                                       +PY311
   File "PYGOLANG/golang/golang_test.py", line ..., in caller
     raise RuntimeError("ccc")
 RuntimeError: ccc
@@ -1631,9 +1637,11 @@ Traceback (most recent call last):
     caller()
   ...
   File "PYGOLANG/golang/__init__.py", line ..., in _
-    return f(*argv, **kw)
+    return f(*argv, **kw)                                       -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
-    d()
+    d()                                                         -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
     d()
   File "PYGOLANG/golang/golang_test.py", line ..., in q1
@@ -1654,6 +1662,13 @@ def test_defer_excchain_dump():
 
 # ----//---- (ipython)
 def test_defer_excchain_dump_ipython():
+    # ipython 8 changed traceback output significantly
+    # we do not need to test it because we acticate ipython-related patch only
+    # on py2 for which latest ipython version is 5.
+    import IPython
+    if six.PY3 and IPython.version_info >= (8,0):
+        skip("ipython is patched only on py2; ipython8 changed traceback format")
+
     tbok = readfile(dir_testprog + "/golang_test_defer_excchain.txt-ipython")
     retcode, stdout, stderr = _pyrun(["-m", "IPython", "--quick", "--colors=NoColor",
                                 "-m", "golang_test_defer_excchain"],
@@ -1724,8 +1739,28 @@ def _pyrun(argv, stdin=None, stdout=None, stderr=None, **kw):   # -> retcode, st
         pathv.extend(envpath.split(os.pathsep))
     env['PYTHONPATH'] = os.pathsep.join(pathv)
 
+    # set $PYTHONIOENCODING to encoding of stdin/stdout/stderr
+    # we need to do it because on Windows `python x.py | ...` runs with stdio
+    # encoding set to cp125X even if just `python x.py` runs with stdio
+    # encoding=UTF-8.
+    if 'PYTHONIOENCODING' not in env:
+        enc = set([_.encoding for _ in (sys.stdin, sys.stdout, sys.stderr)])
+        if None in enc:         # without -s pytest uses _pytest.capture.DontReadFromInput
+            enc.remove(None)    # with None .encoding
+        assert len(enc) == 1
+        env['PYTHONIOENCODING'] = enc.pop()
+
     p = Popen(argv, stdin=(PIPE if stdin else None), stdout=stdout, stderr=stderr, env=env, **kw)
     stdout, stderr = p.communicate(stdin)
+
+    # on windows print emits \r\n instead of just \n
+    # normalize that to \n in *out
+    if os.name == 'nt':
+        if stdout is not None:
+            stdout = stdout.replace(b'\r\n', b'\n')
+        if stderr is not None:
+            stderr = stderr.replace(b'\r\n', b'\n')
+
     return p.returncode, stdout, stderr
 
 # pyrun runs `sys.executable argv... <stdin`.
@@ -1792,10 +1827,33 @@ def assertDoc(want, got):
     got = got.replace(dir_pygolang,  "PYGOLANG") # /home/x/.../pygolang -> PYGOLANG
     got = got.replace(udir_pygolang, "PYGOLANG") # ~/.../pygolang       -> PYGOLANG
 
+    # got: normalize PYGOLANG\a\b\c -> PYGOLANG/a/b/c
+    #                a\b\c\d.py  -> a/b/c/d.py
+    def _(m):
+        return m.group(0).replace(os.path.sep, '/')
+    got = re.sub(r"(?<=PYGOLANG)[^\s]+(?=\s)",  _, got)
+    got = re.sub(r"([\w\\\.]+)(?=\.py)",        _, got)
+
     # want: process conditionals
-    # PY39(...) -> ... if py39 else ø
-    py39 = sys.version_info >= (3, 9)
-    want = re.sub(r"PY39\((.*)\)", r"\1" if py39 else "", want)
+    # PY39(...) -> ...   if py ≥ 3.9 else ø  (inline)
+    # `... +PY39` -> ... if py ≥ 3.9 else ø  (whole line)
+    # `... -PY39` -> ... if py < 3.9 else ø  (whole line)
+    have = {}  # 'PYxy' -> y/n
+    for minor in (9,10,11):
+        have['PY3%d' % minor] = (sys.version_info >= (3, minor))
+    for x, havex in have.items():
+        want = re.sub(r"%s\((.*)\)" % x, r"\1" if havex else "", want)
+        r = re.compile(r'^(?P<main>.*?) +(?P<y>(\+|-))%s$' % x)
+        v = []
+        for l in want.splitlines():
+            m = r.match(l)
+            if m is not None:
+                l = m.group('main')
+                y = {'+':True, '-':False}[m.group('y')]
+                if (y and not havex) or (havex and not y):
+                    continue
+            v.append(l)
+        want = '\n'.join(v)+'\n'
 
     # want: ^$ -> <BLANKLINE>
     while "\n\n" in want:
@@ -1818,8 +1876,11 @@ def assertDoc(want, got):
 #       ...
 #   fmtargspec(f) -> '(x, y=3)'
 def fmtargspec(f): # -> str
-    with warnings.catch_warnings():
-        warnings.simplefilter('ignore', DeprecationWarning)
+    # inspect.formatargspec is deprecated since py3.5 and was removed in py3.11
+    # -> use inspect.signature instead.
+    if six.PY3:
+        return str(inspect.signature(f))
+    else:
         return inspect.formatargspec(*inspect.getargspec(f))
 
 def test_fmtargspec():
@@ -1828,8 +1889,10 @@ def test_fmtargspec():
 
 
 # readfile returns content of file @path.
-def readfile(path):
-    with open(path, "r") as f:
+def readfile(path): # -> bytes
+    # on windows in text mode files are opened with encoding=locale.getdefaultlocale()
+    # which is CP125X instead of UTF-8. -> manually decode as 'UTF-8'
+    with open(path, "rb") as f:
         return f.read()
 
 # abbrev_home returns path with user home prefix abbreviated with ~.

golang/libgolang.h

 #ifndef _NXD_LIBGOLANG_H
 #define _NXD_LIBGOLANG_H
 
-// Copyright (C) 2018-2022  Nexedi SA and Contributors.
+// Copyright (C) 2018-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -176,6 +176,12 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include <fcntl.h>
+#ifdef _MSC_VER // no mode_t on msvc
+typedef int mode_t;
+#endif
+
+
 // DSO symbols visibility (based on https://gcc.gnu.org/wiki/Visibility)
 #if defined _WIN32 || defined __CYGWIN__
   #define LIBGOLANG_DSO_EXPORT __declspec(dllexport)
@@ -577,7 +583,7 @@ int select(const _selcase (&casev)[N]) {
 
 static inline                       // select(vector<casev>)
 int select(const std::vector<_selcase> &casev) {
-    return _chanselect(&casev[0], casev.size());
+    return _chanselect(casev.data(), casev.size());
 }
 
 // defer(f) mimics `defer f()` from golang.
@@ -829,7 +835,7 @@ struct _interface {
 
 protected:
     // don't use destructor -> use decref
-    ~_interface();
+    LIBGOLANG_API ~_interface();
 };
 typedef refptr<_interface> interface;
 

golang/os.cpp

-// Copyright (C) 2019-2022  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -37,7 +37,8 @@
 // GLIBC <  2.32 provides sys_siglist but not sigdescr_np in its headers
 // cut this short
 // (on darwing sys_siglist declaration is normally provided)
-#ifndef __APPLE__
+// (on windows sys_siglist is not available at all)
+#if !(defined(__APPLE__) || defined(_WIN32))
 extern "C" {
     extern const char * const sys_siglist[];
 }
@@ -226,8 +227,8 @@ tuple<string, error> ReadFile(const string& path) {
 
     while (1) {
         int n;
-        tie(n, err) = f->Read(&buf[0], buf.size());
-        data.append(&buf[0], n);
+        tie(n, err) = f->Read(buf.data(), buf.size());
+        data.append(buf.data(), n);
         if (err != nil) {
             if (err == io::EOF_)
                 err = nil;
@@ -248,7 +249,7 @@ tuple<string, error> ReadFile(const string& path) {
 
 tuple<File, File, error> Pipe() {
     int vfd[2], syserr;
-    syserr = sys::Pipe(vfd);
+    syserr = sys::Pipe(vfd, 0);
     if (syserr != 0)
         return make_tuple(nil, nil, fmt::errorf("pipe: %w", sys::NewErrno(syserr)));
 
@@ -286,8 +287,20 @@ string Signal::String() const {
     const Signal& sig = *this;
     const char *sigstr = nil;
 
+#ifdef _WIN32
+    switch (sig.signo) {
+    case SIGABRT:   return "Aborted";
+    case SIGBREAK:  return "Break";
+    case SIGFPE:    return "Floating point exception";
+    case SIGILL:    return "Illegal instruction";
+    case SIGINT:    return "Interrupt";
+    case SIGSEGV:   return "Segmentation fault";
+    case SIGTERM:   return "Terminated";
+    }
+#else
     if (0 <= sig.signo && sig.signo < NSIG)
         sigstr = ::sys_siglist[sig.signo]; // might be nil as well
+#endif
 
     if (sigstr != nil)
         return string(sigstr);

golang/os.h

 #ifndef _NXD_LIBGOLANG_OS_H
 #define _NXD_LIBGOLANG_OS_H
 //
-// Copyright (C) 2019-2022  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -61,7 +61,7 @@ private:
     ~_File();
     friend File _newFile(_libgolang_ioh* ioh, const string& name);
 public:
-    void decref();
+    LIBGOLANG_API void decref();
 
 public:
     LIBGOLANG_API string  Name()  const;
@@ -95,9 +95,15 @@ private:
 
 // Open opens file @path.
 LIBGOLANG_API std::tuple<File, error> Open(const string &path, int flags = O_RDONLY,
-        mode_t mode = S_IRUSR | S_IWUSR | S_IXUSR |
+        mode_t mode =
+#if !defined(_MSC_VER)
+                      S_IRUSR | S_IWUSR | S_IXUSR |
                       S_IRGRP | S_IWGRP | S_IXGRP |
-                      S_IROTH | S_IWOTH | S_IXOTH);
+                      S_IROTH | S_IWOTH | S_IXOTH
+#else
+                      _S_IREAD | _S_IWRITE
+#endif
+        );
 
 // NewFile wraps OS-level file-descriptor into File.
 // The ownership of sysfd is transferred to File.

golang/os/signal.cpp

-// Copyright (C) 2021-2022  Nexedi SA and Contributors.
+// Copyright (C) 2021-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -89,6 +89,10 @@
 #include <atomic>
 #include <tuple>
 
+#if defined(_WIN32)
+# include <windows.h>
+#endif
+
 
 #define DEBUG 0
 #if DEBUG
@@ -97,6 +101,12 @@
 #  define debugf(format, ...) do {} while (0)
 #endif
 
+#if defined(_MSC_VER)
+# define HAVE_SIGACTION 0
+#else
+# define HAVE_SIGACTION 1
+#endif
+
 // golang::os::signal::
 namespace golang {
 namespace os {
@@ -109,13 +119,30 @@ using std::tie;
 using std::vector;
 using cxx::set;
 
+#if HAVE_SIGACTION
+static void xsigemptyset(sigset_t *sa_mask);
+#else
+// custom `struct sigaction` emulated via signal(2)
+#define SA_SIGINFO  1
+typedef struct {} siginfo_t;
+struct sigaction {
+    union {
+        void (*sa_handler)(int);
+        void (*sa_sigaction)(int, siginfo_t*, void*);
+    };
+    int  sa_flags;
+};
+static void _os_sighandler_nosigaction(int sig);
+#endif
+
 static void _os_sighandler(int sig, siginfo_t *info, void *ucontext);
 static void _notify(int signo);
 static void _checksig(int signo);
 static void _checkActEqual(const struct sigaction *a, const struct sigaction *b);
 static void _spinwaitNextQueueCycle();
+
+static int  sys_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact);
 static void xsys_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact);
-static void xsigemptyset(sigset_t *sa_mask);
 static bool _sigact_equal(const struct sigaction *a, const struct sigaction *b);
 
 
@@ -160,27 +187,31 @@ void _init() {
 
     // create _wakerx <-> _waketx pipe; set _waketx to nonblocking mode
     int vfd[2];
-    if (sys::Pipe(vfd) < 0)
+    if (sys::Pipe(vfd, O_CLOEXEC) < 0)
         panic("pipe(_wakerx, _waketx)");        // TODO +syserr
-    if (sys::Fcntl(vfd[0], F_SETFD, FD_CLOEXEC) < 0)
-        panic("fcntl(_wakerx, FD_CLOEXEC)");    // TODO +syserr
     error err;
     tie(_wakerx, err) = os::NewFile(vfd[0], "_wakerx");
     if (err != nil)
         panic("os::newFile(_wakerx");
     _waketx = vfd[1];
+#ifndef _WIN32
     if (sys::Fcntl(_waketx, F_SETFL, O_NONBLOCK) < 0)
         panic("fcntl(_waketx, O_NONBLOCK)");    // TODO +syserr
-    if (sys::Fcntl(_waketx, F_SETFD, FD_CLOEXEC) < 0)
-        panic("fcntl(_waketx, FD_CLOEXEC)");    // TODO +syserr
+#else
+    HANDLE hwaketx = (HANDLE)_get_osfhandle(_waketx);
+    DWORD  mode    = PIPE_READMODE_BYTE | PIPE_NOWAIT;
+    if (!SetNamedPipeHandleState(hwaketx, &mode, NULL, NULL))
+        panic("SetNamedPipeHandleState(hwaketx, PIPE_NOWAIT)"); // TODO +syserr
+#endif
 
     _actIgnore.sa_handler = SIG_IGN;
     _actIgnore.sa_flags   = 0;
-    xsigemptyset(&_actIgnore.sa_mask);
-
     _actNotify.sa_sigaction = _os_sighandler;
     _actNotify.sa_flags     = SA_SIGINFO;
+#if HAVE_SIGACTION
+    xsigemptyset(&_actIgnore.sa_mask);
     xsigemptyset(&_actNotify.sa_mask);
+#endif
 }
 
 
@@ -248,6 +279,14 @@ done:
             if (sah != SIG_IGN) {
                 if (sah != SIG_DFL) {
                     sah(sig);
+                    // handlers installed via signal usually reinstall themselves
+                    // return it back to us
+                    struct sigaction after;
+                    xsys_sigaction(sig, &_actNotify, &after);
+                    if (! (_sigact_equal(&after, &_actNotify)   ||
+                           ( ((after.sa_flags & SA_SIGINFO) == 0)   &&
+                             ((after.sa_handler == SIG_DFL) || (after.sa_handler == sah)))))
+                        panic("collision detected wrt thirdparty signal usage");
                 }
                 else {
                     // SIG_DFL && _SigReset - reraise to die if the signal is fatal
@@ -343,7 +382,7 @@ static int/*syserr*/ _Notify1(chan<os::Signal> ch, os::Signal sig) {
 
     // retrieve current signal action
     struct sigaction cur;
-    int syserr = sys::Sigaction(sig.signo, nil, &cur);
+    int syserr = sys_sigaction(sig.signo, nil, &cur);
     if (syserr < 0) {
         // TODO reenable once we can panic with any object
         //return fmt::errorf("sigaction sig%d: %w", sig.signo, sys::NewErrno(syserr);
@@ -389,7 +428,7 @@ static int/*syserr*/ _Notify1(chan<os::Signal> ch, os::Signal sig) {
 
         // register our sigaction
         struct sigaction old;
-        syserr = sys::Sigaction(sig.signo, &_actNotify, &old);
+        syserr = sys_sigaction(sig.signo, &_actNotify, &old);
         if (syserr < 0) {
             // TODO reenable once we can panic with any object
             //return fmt::errorf("sigaction sig%d: %w", sig.signo, sys::NewErrno(syserr);
@@ -469,7 +508,7 @@ static int/*syserr*/ _Ignore1(os::Signal sig) {
     if (h == nil) {
         h = new _SigHandler();
         h->sigstate.store(_SigIgnoring);
-        int syserr = sys::Sigaction(sig.signo, nil, &h->prev_act);
+        int syserr = sys_sigaction(sig.signo, nil, &h->prev_act);
         if (syserr < 0) {
             delete h;
             return syserr; // TODO errctx
@@ -481,7 +520,7 @@ static int/*syserr*/ _Ignore1(os::Signal sig) {
     h->sigstate.store(_SigIgnoring);
     h->subscribers.clear();
 
-    int syserr = sys::Sigaction(sig.signo, &_actIgnore, nil);
+    int syserr = sys_sigaction(sig.signo, &_actIgnore, nil);
     if (syserr < 0)
         return syserr; // TODO errctx
 
@@ -509,7 +548,7 @@ static int/*syserr*/ _Reset1(os::Signal sig) {
     h->sigstate.store(_SigReset);
 
     struct sigaction act;
-    int syserr = sys::Sigaction(sig.signo, &h->prev_act, &act);
+    int syserr = sys_sigaction(sig.signo, &h->prev_act, &act);
     if (syserr < 0)
         return syserr; // TODO errctx
     if (sigstate == _SigNotifying)
@@ -617,16 +656,75 @@ static void _checksig(int signo) {
 }
 
 
+#if HAVE_SIGACTION
 static void xsigemptyset(sigset_t *sa_mask) {
     if (sigemptyset(sa_mask) < 0)
         panic("sigemptyset failed"); // must always succeed
 }
+#endif
 
 static void xsys_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact) {
-    int syserr = sys::Sigaction(signo, act, oldact);
+    int syserr = sys_sigaction(signo, act, oldact);
     if (syserr != 0)
         panic("sigaction failed");   // TODO add errno detail
 }
+static int sys_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact) {
+#if HAVE_SIGACTION
+    return sys::Sigaction(signo, act, oldact);
+#else
+    sys::sighandler_t oldh, newh;
+    int syserr;
+
+    if (act == nil) {
+        newh = SIG_GET;
+    }
+    else if (act->sa_flags & SA_SIGINFO) {
+        if (act->sa_sigaction != _os_sighandler)
+            panic("BUG: compat sigaction: act->sa_sigaction != _os_sighandler");
+        newh = _os_sighandler_nosigaction;
+    }
+    else {
+        newh = act->sa_handler;
+    }
+
+    oldh = sys::Signal(signo, newh, &syserr);
+    if (oldh == SIG_ERR)
+        return syserr;
+    if (oldact != nil) {
+        if (oldh == _os_sighandler_nosigaction) {
+            oldact->sa_sigaction = _os_sighandler;
+            oldact->sa_flags     = SA_SIGINFO;
+        }
+        else {
+            oldact->sa_handler   = oldh;
+            oldact->sa_flags     = 0;
+        }
+    }
+    return 0;
+#endif
+}
+
+#if !HAVE_SIGACTION
+static void _os_sighandler_nosigaction(int sig) {
+    // reinstall sighandler since on handler invocation it is reset to SIG_DFL.
+    // do it as fast as we can as the first thing - to minimize window of race
+    // while signal handler is reset from being our _os_sighandler.
+    //
+    // NOTE it is ok to reinstall before invoking _os_sighandler because
+    // _os_sighandler uses only atomics and pipe write and so is reentrant.
+    sys::sighandler_t h;
+    int syserr;
+    h = sys::Signal(sig, _os_sighandler_nosigaction, &syserr);
+    if (h == SIG_ERR)
+        panic("signal(reinstall) failed");
+    if ( !(h == SIG_DFL /*reset*/ ||
+           h == _os_sighandler_nosigaction /*concurrent sighandler*/) )
+        panic("collision detected wrt thirdparty signal usage");
+
+    // invoke _os_sighandler as if it was setup by sigaction.
+    _os_sighandler(sig, NULL, NULL);
+}
+#endif
 
 static bool _sigact_equal(const struct sigaction *a, const struct sigaction *b) {
     // don't compare sigaction by memcmp - it will fail because struct sigaction

golang/os/signal_test.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2021-2022  Nexedi SA and Contributors.
+# Copyright (C) 2021-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -30,12 +30,27 @@ from golang.golang_test import panics, _pyrun
 from pytest import raises
 from subprocess import PIPE
 
+try:
+    from signal import raise_signal
+except ImportError: # py2
+    from _testcapi import raise_signal
+
 
 # directories
 dir_os       = dirname(__file__)    # .../pygolang/os
 dir_testprog = dir_os + "/testprog" # .../pygolang/os/testprog
 
 
+# default to use SIGUSR1/SIGUSR2 in tests.
+# but use SIGTERM/SIGINT if those are not available (windows).
+try:
+    SIG1 = getattr(syscall, 'SIGUSR1')
+    SIG2 = getattr(syscall, 'SIGUSR2')
+except AttributeError:
+    SIG1 = syscall.SIGTERM
+    SIG2 = syscall.SIGINT
+
+
 N = 1000
 
 # test_signal verifies signal delivery to channels controlled by Notify/Stop/Ignore/Reset.
@@ -43,9 +58,9 @@ N = 1000
 def test_signal():
     # Notify/Stop with wrong chan dtype -> panic
     _ = panics("pychan: channel type mismatch")
-    with _:  signal.Notify(chan(2), syscall.SIGUSR1)
+    with _:  signal.Notify(chan(2), SIG1)
     with _:  signal.Stop  (chan(2))
-    with _:  signal.Notify(chan(2, dtype='C.int'), syscall.SIGUSR1)
+    with _:  signal.Notify(chan(2, dtype='C.int'), SIG1)
     with _:  signal.Stop  (chan(2, dtype='C.int'))
 
     # Notify/Ignore/Reset with wrong signal type
@@ -54,109 +69,109 @@ def test_signal():
     with _:  signal.Ignore(None)
     with _:  signal.Reset(None)
 
-    # subscribe ch1(USR1), ch12(USR1,USR2) and ch2(USR2)
+    # subscribe ch1(SIG1), ch12(SIG1,SIG2) and ch2(SIG2)
     ch1  = chan(2, dtype=gos.Signal)
     ch12 = chan(2, dtype=gos.Signal)
     ch2  = chan(2, dtype=gos.Signal)
-    signal.Notify(ch1,  syscall.SIGUSR1)
-    signal.Notify(ch12, syscall.SIGUSR1, syscall.SIGUSR2)
-    signal.Notify(ch2,                   syscall.SIGUSR2)
+    signal.Notify(ch1,  SIG1)
+    signal.Notify(ch12, SIG1, SIG2)
+    signal.Notify(ch2,        SIG2)
     def _():
         signal.Reset()
     defer(_)
 
     for i in range(N):
-        # raise SIGUSR1 -> should be delivered to ch1 and ch12
+        # raise SIG1 -> should be delivered to ch1 and ch12
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1 and len(ch12) == 1)
         sig1  = ch1.recv()
         sig12 = ch12.recv()
-        assert sig1  == syscall.SIGUSR1
-        assert sig12 == syscall.SIGUSR1
+        assert sig1  == SIG1
+        assert sig12 == SIG1
 
-        # raise SIGUSR2 -> should be delivered to         ch12 and ch2
+        # raise SIG2 -> should be delivered to         ch12 and ch2
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR2)
+        killme(SIG2)
         waitfor(lambda: len(ch12) == 1 and len(ch2) == 1)
         sig12 = ch12.recv()
         sig2  = ch2.recv()
-        assert sig12 == syscall.SIGUSR2
-        assert sig2  == syscall.SIGUSR2
-        # if SIGUSR2 will be eventually delivered to ch1 - it will break
-        # in SIGUSR1 check on next iteration.
+        assert sig12 == SIG2
+        assert sig2  == SIG2
+        # if SIG2 will be eventually delivered to ch1 - it will break
+        # in SIG1 check on next iteration.
 
     # Stop(ch2) -> signals should not be delivered to ch2 anymore
     signal.Stop(ch2)
     for i in range(N):
-        # USR1 -> ch1, ch12
+        # SIG1 -> ch1, ch12
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1 and len(ch12) == 1)
         sig1  = ch1.recv()
         sig12 = ch12.recv()
-        assert sig1  == syscall.SIGUSR1
-        assert sig12 == syscall.SIGUSR1
+        assert sig1  == SIG1
+        assert sig12 == SIG1
 
-        # USR2 -> ch12, !ch2
+        # SIG2 -> ch12, !ch2
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR2)
+        killme(SIG2)
         waitfor(lambda: len(ch12) == 1)
         sig12 = ch12.recv()
-        assert sig12 == syscall.SIGUSR2
-        # if SIGUSR2 will be eventually delivered to ch2 - it will break on
+        assert sig12 == SIG2
+        # if SIG2 will be eventually delivered to ch2 - it will break on
         # next iteration.
 
-    # Ignore(USR1) -> ch1 should not be delivered to anymore, ch12 should be delivered only USR2
-    signal.Ignore(syscall.SIGUSR1)
+    # Ignore(SIG1) -> ch1 should not be delivered to anymore, ch12 should be delivered only SIG2
+    signal.Ignore(SIG1)
     for i in range(N):
-        # USR1 -> ø
+        # SIG1 -> ø
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         time.sleep(1E-6)
 
-        # USR2 -> ch12
+        # SIG2 -> ch12
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR2)
+        killme(SIG2)
         waitfor(lambda: len(ch12) == 1)
         sig12 = ch12.recv()
-        assert sig12 == syscall.SIGUSR2
-        # if SIGUSR1 or SIGUSR2 will be eventually delivered to ch1 or ch2 - it
+        assert sig12 == SIG2
+        # if SIG1 or SIG2 will be eventually delivered to ch1 or ch2 - it
         # will break on next iteration.
 
     # Notify after Ignore
-    signal.Notify(ch1, syscall.SIGUSR1)
+    signal.Notify(ch1, SIG1)
     for i in range(N):
-        # USR1 -> ch1
+        # SIG1 -> ch1
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1)
         sig1 = ch1.recv()
-        assert sig1 == syscall.SIGUSR1
+        assert sig1 == SIG1
 
-        # USR2 -> ch12
+        # SIG2 -> ch12
         assert len(ch1)  == 0
         assert len(ch12) == 0
         assert len(ch2)  == 0
-        killme(syscall.SIGUSR2)
+        killme(SIG2)
         waitfor(lambda: len(ch12) == 1)
         sig12 = ch12.recv()
-        assert sig12 == syscall.SIGUSR2
-        # if SIGUSR1 or SIGUSR2 will be eventually delivered to wrong place -
+        assert sig12 == SIG2
+        # if SIG1 or SIG2 will be eventually delivered to wrong place -
         # it will break on next iteration.
 
     # Reset is tested in test_stdlib_interop (it needs non-terminating default
@@ -173,11 +188,11 @@ def test_notify_reinstall():
 
     for i in range(N):
         signal.Stop(ch)
-        signal.Notify(ch, syscall.SIGUSR1)
+        signal.Notify(ch, SIG1)
 
     time.sleep(0.1*time.second)
     assert len(ch) == 0
-    killme(syscall.SIGUSR1)
+    killme(SIG1)
     time.sleep(0.1*time.second)
     assert len(ch) == 1
 
@@ -188,7 +203,7 @@ def test_signal_all():
     assert b"ok (notify)"        in out
     assert b"ok (ignore)"        in out
     assert b"terminating ..."    in out
-    assert retcode == -syscall.SIGTERM.signo
+    assert retcode == (-syscall.SIGTERM.signo  if os.name != 'nt'  else 3)
 
 
 # test_stdlib_interop verifies that there is minimal compatibility in between
@@ -206,23 +221,23 @@ def test_stdlib_interop():
 
     ch1 = chan(2, dtype=object) # NOTE not gos.Signal nor 'C.os::Signal'
     def _(signo, frame):
-        ch1.send("USR1")
-    pysig.signal(pysig.SIGUSR1, _)
+        ch1.send("SIG1")
+    pysig.signal(SIG1.signo, _)
     def _():
-        pysig.signal(pysig.SIGUSR1, pysig.SIG_IGN)
+        pysig.signal(SIG1.signo, pysig.SIG_IGN)
     defer(_)
 
     # verify that plain pysig delivery works
     for i in range(N):
         assert len(ch1) == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1)
         obj1 = ch1.recv()
-        assert obj1 == "USR1"
+        assert obj1 == "SIG1"
 
     # verify that combined pysig + golang.os.signal delivery works
     ch2 = chan(2, dtype=gos.Signal)
-    signal.Notify(ch2, syscall.SIGUSR1)
+    signal.Notify(ch2, SIG1)
     def _():
         signal.Stop(ch2)
     defer(_)
@@ -230,46 +245,46 @@ def test_stdlib_interop():
     for i in range(N):
         assert len(ch1) == 0
         assert len(ch2) == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1 and len(ch2) == 1)
         obj1 = ch1.recv()
         sig2 = ch2.recv()
-        assert obj1 == "USR1"
-        assert sig2 == syscall.SIGUSR1
+        assert obj1 == "SIG1"
+        assert sig2 == SIG1
 
     # Ignore stops delivery to both pysig and golang.os.signal
-    signal.Ignore(syscall.SIGUSR1)
+    signal.Ignore(SIG1)
     for i in range(N):
         assert len(ch1) == 0
         assert len(ch2) == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         time.sleep(1E-6)
     time.sleep(0.1) # just in case
     assert len(ch1) == 0
     assert len(ch2) == 0
 
     # after Reset pysig delivery is restored even after Ignore
-    signal.Reset(syscall.SIGUSR1)
+    signal.Reset(SIG1)
     for i in range(N):
         assert len(ch1) == 0
         assert len(ch2) == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1)
         assert len(ch2) == 0
         obj1 = ch1.recv()
-        assert obj1 == "USR1"
+        assert obj1 == "SIG1"
 
     # Reset stops delivery to golang.os.signal and restores pysig delivery
-    signal.Notify(ch2, syscall.SIGUSR1)
-    signal.Reset(syscall.SIGUSR1)
+    signal.Notify(ch2, SIG1)
+    signal.Reset(SIG1)
     for i in range(N):
         assert len(ch1) == 0
         assert len(ch2) == 0
-        killme(syscall.SIGUSR1)
+        killme(SIG1)
         waitfor(lambda: len(ch1) == 1)
         assert len(ch2) == 0
         obj1 = ch1.recv()
-        assert obj1 == "USR1"
+        assert obj1 == "SIG1"
 
 
 # test_stdlib_interop_KeyboardInterrupt verifies that signal.{Notify,Ignore} disable
@@ -353,8 +368,9 @@ def test_stdlib_interop_KeyboardInterrupt():
 
 # killme sends signal sig to own process.
 def killme(sig):
-    mypid = os.getpid()
-    os.kill(mypid, sig.signo)
+    # use raise(sig) instead of kill(mypid, sig) so that it works on windows,
+    # where os.kill unconditionally terminates target process.
+    raise_signal(sig.signo)
 
 # wait for waits until cond() becomes true or timeout.
 def waitfor(cond):

golang/os/testprog/signal_test_all.py

 #!/usr/bin/env python
-# Copyright (C) 2021-2022  Nexedi SA and Contributors.
+# Copyright (C) 2021-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -24,7 +24,8 @@ from __future__ import print_function, absolute_import
 from golang import chan
 from golang import os as gos, syscall, time
 from golang.os import signal
-import os, sys
+from golang.os.signal_test import killme
+import sys
 
 def main():
     # build "all signals" list
@@ -35,11 +36,17 @@ def main():
             if sig not in allsigv: # avoid e.g. SIGCHLD/SIGCLD dups
                 allsigv.append(sig)
     allsigv.sort(key=lambda sig: sig.signo)
-    allsigv.remove(syscall.SIGKILL) # SIGKILL/SIGSTOP cannot be caught
-    allsigv.remove(syscall.SIGSTOP)
-    allsigv.remove(syscall.SIGBUS)  # AddressSanitizer crashes on SIGBUS/SIGFPE/SIGSEGV
-    allsigv.remove(syscall.SIGFPE)
-    allsigv.remove(syscall.SIGSEGV)
+    def without(signame):
+        sig = getattr(syscall, signame, None)
+        if sig is not None:
+            allsigv.remove(sig)
+    without('SIGKILL') # SIGKILL/SIGSTOP cannot be caught
+    without('SIGSTOP')
+    without('SIGBUS')  # AddressSanitizer crashes on SIGBUS/SIGFPE/SIGSEGV
+    without('SIGFPE')
+    without('SIGSEGV')
+    without('SIGILL')  # SIGILL/SIGABRT cause termination on windows
+    without('SIGABRT')
 
     # Notify() -> kill * -> should be notified
     ch = chan(10, dtype=gos.Signal)
@@ -72,11 +79,6 @@ def main():
     killme(syscall.SIGTERM)
     raise AssertionError("not terminated")
 
-# killme sends signal sig to own process.
-def killme(sig):
-    mypid = os.getpid()
-    os.kill(mypid, sig.signo)
-
 def emit(msg=''):
     print(msg)
     sys.stdout.flush()

golang/pyx/build.py

-# Copyright (C) 2019-2022  Nexedi SA and Contributors.
+# Copyright (C) 2019-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -73,8 +73,10 @@ _dso_build_ext = setuptools_dso.build_ext
 class build_ext(_dso_build_ext):
     def build_extension(self, ext):
         # wrap _compiler <src> -> <obj> with our code
+
+        # ._compile is used on gcc/clang but not with msvc
         _compile = self.compiler._compile
-        def _(obj, src, ext, cc_args, extra_postargs, pp_opts):
+        def xcompile(obj, src, ext, cc_args, extra_postargs, pp_opts):
             # filter_out removes arguments that start with argprefix
             cc_args         = cc_args[:]
             extra_postargs  = extra_postargs[:]
@@ -101,11 +103,30 @@ class build_ext(_dso_build_ext):
                 filter_out('-std=gnu++')
 
             _compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
-        self.compiler._compile = _
+
+        # msvc handles all sources directly in the loop in .compile and we can
+        # do per-source adjustsment only in .spawn .
+        spawn = self.compiler.spawn
+        def xspawn(argv):
+            c = False
+            for arg in argv:
+                if arg.startswith('/Tc'):
+                    c = True
+            if c:
+                argv = argv[:]
+                for i in range(len(argv)):
+                    if argv[i] == '/std:c++20':
+                        argv[i] = '/std:c11'
+
+            return spawn(argv)
+
+        self.compiler._compile = xcompile
+        self.compiler.spawn    = xspawn
         try:
             _dso_build_ext.build_extension(self, ext) # super doesn't work for _dso_build_ext
         finally:
             self.compiler._compile = _compile
+            self.compiler.spawn    = spawn
 
 
 # setup should be used instead of setuptools.setup
@@ -128,14 +149,14 @@ def setup(**kw):
 #       x_dsos = [DSO('mypkg.mydso', ['mypkg/mydso.cpp'])],
 #   )
 def DSO(name, sources, **kw):
-    _, kw = _with_build_defaults(kw)
+    _, kw = _with_build_defaults(name, kw)
     dso = setuptools_dso.DSO(name, sources, **kw)
     return dso
 
 
 # _with_build_defaults returns copy of kw amended with build options common for
 # both DSO and Extension.
-def _with_build_defaults(kw):   # -> (pygo, kw')
+def _with_build_defaults(name, kw):   # -> (pygo, kw')
     # find pygolang root
     gopkg = _findpkg("golang")
     pygo  = dirname(gopkg.path) # .../pygolang/golang -> .../pygolang
@@ -144,12 +165,19 @@ def _with_build_defaults(kw):   # -> (pygo, kw')
 
     kw = kw.copy()
 
+    sysname = platform.system().lower()
+    win  = (sysname == 'windows')
+    msvc = win  # TODO also support mingw ?
+
     # prepend   -I<pygolang> so that e.g. golang/libgolang.h is found
+    # same with -I<pygolang>/golang/_compat/<os>
     incv = kw.get('include_dirs', [])[:]
     incv.insert(0, pygo)
+    incv.insert(1, join(pygo, 'golang', '_compat', sysname))
     kw['include_dirs'] = incv
 
-    # link with libgolang.so
+    # link with libgolang.so  if it is not libgolang itself
+    if name != 'golang.runtime.libgolang':
         dsov = kw.get('dsos', [])[:]
         dsov.insert(0, 'golang.runtime.libgolang')
         kw['dsos'] = dsov
@@ -160,9 +188,20 @@ def _with_build_defaults(kw):   # -> (pygo, kw')
     # default to C++11 (chan[T] & co require C++11 features)
     ccdefault = []
     if lang == 'c++':
+        if not msvc:
+            if name == 'golang.runtime.libgolang':
+                ccdefault.append('-std=gnu++11') # not c++11 as linux/list.h uses typeof
+            else:
                 ccdefault.append('-std=c++11')
+        else:
+            # MSVC requries C++20 for designated struct initializers
+            ccdefault.append('/std:c++20')
+            # and make exception handling: "fully conformant", so that e.g. extern "C" `panic` works
+            ccdefault.extend(['/EHc-', '/EHsr'])
+
     # default to no strict-aliasing
-    ccdefault.append('-fno-strict-aliasing')
+    if not msvc:
+        ccdefault.append('-fno-strict-aliasing') # use only on gcc/clang - msvc does it by default
 
     _ = kw.get('extra_compile_args', [])[:]
     _[0:0] = ccdefault              # if another e.g. -std=... was already there -
@@ -188,6 +227,8 @@ def _with_build_defaults(kw):   # -> (pygo, kw')
         'os/signal.h',
         'pyx/runtime.h',
         '_testing.h',
+        '_compat/windows/strings.h',
+        '_compat/windows/unistd.h',
     ]])
     kw['depends'] = dependv
 
@@ -203,7 +244,7 @@ def _with_build_defaults(kw):   # -> (pygo, kw')
 #       ext_modules = [Extension('mypkg.mymod', ['mypkg/mymod.pyx'])],
 #   )
 def Extension(name, sources, **kw):
-    pygo, kw = _with_build_defaults(kw)
+    pygo, kw = _with_build_defaults(name, kw)
 
     # some pyx-level depends to workaround a bit lack of proper dependency
     # tracking in setuptools/distutils.

golang/pyx/runtime.h

 #ifndef _NXD_LIBGOLANG_PYX_RUNTIME_H
 #define _NXD_LIBGOLANG_PYX_RUNTIME_H
 
-// Copyright (C) 2018-2019  Nexedi SA and Contributors.
+// Copyright (C) 2018-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -58,8 +58,8 @@ class _PyError final : public _error, object {
 private:
     _PyError();
     ~_PyError();
-    friend error PyErr_Fetch();
-    friend void  PyErr_ReRaise(PyError pyerr);
+    friend LIBPYXRUNTIME_API error PyErr_Fetch();
+    friend LIBPYXRUNTIME_API void  PyErr_ReRaise(PyError pyerr);
 public:
     LIBPYXRUNTIME_API void incref();
     LIBPYXRUNTIME_API void decref();

golang/pyx/testprog/cmdclass_custom.py

-# Copyright (C) 2019  Nexedi SA and Contributors.
+# Copyright (C) 2019-2022  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -29,4 +29,9 @@ class mybuild_ext(build_ext):
 
 setup(
     cmdclass    = {'build_ext': mybuild_ext},
+
+    # avoid setuptools thinking nearby golang_pyx_user/ golang_dso_user/ also
+    # relate to hereby setup and rejecting the build.
+    # https://stackoverflow.com/questions/72294299/multiple-top-level-packages-discovered-in-a-flat-layout
+    py_modules  = [],
 )

golang/pyx/testprog/golang_dso_user/dsouser/dso.cpp

-// Copyright (C) 2019  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                         Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -20,7 +20,7 @@
 // Small library that uses a bit of libgolang features, mainly to verify
 // that external project can build against libgolang.
 
-#include <golang/libgolang.h>
+#include "dso.h"
 using namespace golang;
 
 #include <stdio.h>

golang/pyx/testprog/golang_dso_user/dsouser/dso.h

+// Copyright (C) 2023  Nexedi SA and Contributors.
+//                     Kirill Smelkov <kirr@nexedi.com>
+//
+// This program is free software: you can Use, Study, Modify and Redistribute
+// it under the terms of the GNU General Public License version 3, or (at your
+// option) any later version, as published by the Free Software Foundation.
+//
+// You can also Link and Combine this program with other software covered by
+// the terms of any of the Free Software licenses or any of the Open Source
+// Initiative approved licenses and Convey the resulting work. Corresponding
+// source of such a combination shall include the source code for all other
+// software used.
+//
+// This program is distributed WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+// See COPYING file for full licensing terms.
+// See https://www.nexedi.com/licensing for rationale and options.
+
+#ifndef _NXD_GOLANG_DSOUSER_DSO_H
+#define _NXD_GOLANG_DSOUSER_DSO_H
+
+#include <golang/libgolang.h>
+
+#if BUILDING_DSOUSER_DSO
+#  define DSOUSER_DSO_API LIBGOLANG_DSO_EXPORT
+#else
+#  define DSOUSER_DSO_API LIBGOLANG_DSO_IMPORT
+#endif
+
+DSOUSER_DSO_API void dsotest();
+
+#endif // _NXD_GOLANG_DSOUSER_DSO_H

golang/pyx/testprog/golang_dso_user/dsouser/test.pyx

 # cython: language_level=2
 #
-# Copyright (C) 2019  Nexedi SA and Contributors.
+# Copyright (C) 2019-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -21,10 +21,7 @@
 
 # Small test driver that calls dso.so .
 
-cdef extern from * nogil:
-    """
-    void dsotest();
-    """
+cdef extern from "dso.h" nogil:
     void dsotest()
 
 def main():

golang/pyx/testprog/golang_dso_user/setup.py

-# Copyright (C) 2019  Nexedi SA and Contributors.
+# Copyright (C) 2019-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -24,7 +24,9 @@ setup(
     name        = 'golang_dso_user',
     description = 'test project that uses libgolang from a dso',
 
-    x_dsos      = [DSO('dsouser.dso', ['dsouser/dso.cpp'])],
+    x_dsos      = [DSO('dsouser.dso',
+                       ['dsouser/dso.cpp'],
+                       define_macros = [('BUILDING_DSOUSER_DSO', None)])],
     ext_modules = [Extension('dsouser.test',
                     ['dsouser/test.pyx'],
                     dsos = ['dsouser.dso'])],

golang/runtime/_runtime_gevent.pyx

 # cython: language_level=2
-# Copyright (C) 2019-2022  Nexedi SA and Contributors.
+# Copyright (C) 2019-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -57,7 +57,7 @@ from posix.fcntl cimport mode_t, F_GETFL, F_SETFL, O_NONBLOCK, O_ACCMODE, O_RDON
 from posix.stat cimport struct_stat, S_ISREG, S_ISDIR, S_ISBLK
 from posix.strings cimport bzero
 
-from gevent.fileobject import FileObjectThread, FileObjectPosix
+from gevent import fileobject as gfileobj
 
 
 # _goviapy & _togo serve go
@@ -194,6 +194,7 @@ cdef nogil:
         return ioh
 
     _libgolang_ioh* _io_fdopen(int *out_syserr, int sysfd):
+        IF POSIX:
             # check if we should enable O_NONBLOCK on this file-descriptor
             # even though we could enable O_NONBLOCK for regular files, it does not
             # work as expected as most unix'es report regular files as always read
@@ -220,6 +221,13 @@ cdef nogil:
                     out_syserr[0] = syserr
                     return NULL
 
+        ELSE: # !POSIX (windows)
+            cdef bint blocking = True
+            # FIXME acc: use GetFileInformationByHandleEx to determine whether
+            # HANDLE(sysfd) was opened for reading or writing.
+            # https://stackoverflow.com/q/9442436/9456786
+            cdef int acc = O_RDWR
+
         # create IOH backed by FileObjectThread or FileObjectPosix
         ioh = <IOH*>calloc(1, sizeof(IOH))
         if ioh == NULL:
@@ -253,9 +261,9 @@ cdef:
         pygfobj = None
         try:
             if blocking:
-                pygfobj = FileObjectThread(sysfd, mode=mode, buffering=0)
+                pygfobj = gfileobj.FileObjectThread(sysfd, mode=mode, buffering=0)
             else:
-                pygfobj = FileObjectPosix(sysfd, mode=mode, buffering=0)
+                pygfobj = gfileobj.FileObjectPosix(sysfd, mode=mode, buffering=0)
         except OSError as e:
             out_syserr[0] = -e.errno
         else:
@@ -338,7 +346,19 @@ cdef:
         cdef uint8_t[::1] mem = <uint8_t[:count]>buf
         xmem = memoryview(mem) # to avoid https://github.com/cython/cython/issues/3900 on mem[:0]=b''
         try:
-            n = pygfobj.readinto(xmem)
+            # NOTE buf might be on stack, so it must not be accessed, e.g. from
+            # FileObjectThread, while our greenlet is parked (see STACK_DEAD_WHILE_PARKED
+            # for details). -> Use intermediate on-heap buffer to protect from that.
+            #
+            # Also: we cannot use pygfobj.readinto due to
+            # https://github.com/gevent/gevent/pull/1948
+            #
+            # TODO use .readinto() when buf is not on stack and gevent is
+            # recent enough or pygfobj is not FileObjectThread.
+            #n = pygfobj.readinto(xmem)
+            buf2 = pygfobj.read(count)
+            n = len(buf2)
+            xmem[:n] = buf2
         except OSError as e:
             n = -e.errno
         out_n[0] = n
@@ -361,8 +381,14 @@ cdef:
     bint _io_write(IOH* ioh, int* out_n, const void *buf, size_t count):
         pygfobj = <object>ioh.pygfobj
         cdef const uint8_t[::1] mem = <const uint8_t[:count]>buf
+
+        # NOTE buf might be on stack, so it must not be accessed, e.g. from
+        # FileObjectThread, while our greenlet is parked (see STACK_DEAD_WHILE_PARKED
+        # for details). -> Use intermediate on-heap buffer to protect from that.
+        buf2 = bytearray(mem)
+
         try:
-            n = pygfobj.write(mem)
+            n = pygfobj.write(buf2)
         except OSError as e:
             n = -e.errno
         out_n[0] = n

golang/runtime/internal/atomic.cpp

-// Copyright (C) 2022  Nexedi SA and Contributors.
+// Copyright (C) 2022-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -20,7 +20,9 @@
 #include "golang/runtime/internal/atomic.h"
 #include "golang/libgolang.h"
 
+#ifndef _WIN32
 #include <pthread.h>
+#endif
 
 // golang::internal::atomic::
 namespace golang {
@@ -41,9 +43,12 @@ static void _forkNewEpoch() {
 }
 
 void _init() {
+// there is no fork on windows
+#ifndef _WIN32
     int e = pthread_atfork(/*prepare*/nil, /*inparent*/nil, /*inchild*/_forkNewEpoch);
     if (e != 0)
         panic("pthread_atfork failed");
+#endif
 }
 
 

golang/runtime/internal/syscall.cpp

-// Copyright (C) 2021-2022  Nexedi SA and Contributors.
+// Copyright (C) 2021-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -57,15 +57,18 @@ string _Errno::Error() {
     _Errno& e = *this;
 
     char ebuf[128];
+    bool ok;
 #if __APPLE__
-    int x = ::strerror_r(-e.syserr, ebuf, sizeof(ebuf));
-    if (x == 0)
-        return string(ebuf);
-    return "unknown error " + std::to_string(-e.syserr);
+    ok = (::strerror_r(-e.syserr, ebuf, sizeof(ebuf)) == 0);
+#elif defined(_WIN32)
+    ok = (::strerror_s(ebuf, sizeof(ebuf), -e.syserr) == 0);
 #else
     char *estr = ::strerror_r(-e.syserr, ebuf, sizeof(ebuf));
     return string(estr);
 #endif
+    if (ok)
+        return string(ebuf);
+    return "unknown error " + std::to_string(-e.syserr);
 }
 
 
@@ -99,6 +102,7 @@ __Errno Close(int fd) {
     return err;
 }
 
+#ifndef _WIN32
 __Errno Fcntl(int fd, int cmd, int arg) {
     int save_errno = errno;
     int err = ::fcntl(fd, cmd, arg);
@@ -107,6 +111,7 @@ __Errno Fcntl(int fd, int cmd, int arg) {
     errno = save_errno;
     return err;
 }
+#endif
 
 __Errno Fstat(int fd, struct ::stat *out_st) {
     int save_errno = errno;
@@ -119,6 +124,10 @@ __Errno Fstat(int fd, struct ::stat *out_st) {
 
 int Open(const char *path, int flags, mode_t mode) {
     int save_errno = errno;
+#ifdef _WIN32  // default to open files in binary mode
+    if ((flags & (_O_TEXT | _O_BINARY)) == 0)
+        flags |= _O_BINARY;
+#endif
     int fd = ::open(path, flags, mode);
     if (fd < 0)
         fd = -errno;
@@ -126,15 +135,39 @@ int Open(const char *path, int flags, mode_t mode) {
     return fd;
 }
 
-__Errno Pipe(int vfd[2]) {
+__Errno Pipe(int vfd[2], int flags) {
+    // supported flags: O_CLOEXEC
+    if (flags & ~(O_CLOEXEC))
+        return -EINVAL;
     int save_errno = errno;
-    int err = ::pipe(vfd);
+    int err;
+#ifdef __linux__
+    err = ::pipe2(vfd, flags);
+#elif defined(_WIN32)
+    err = ::_pipe(vfd, 4096, flags | _O_BINARY);
+#else
+    err = ::pipe(vfd);
+    if (err)
+        goto out;
+    if (flags & O_CLOEXEC) {
+        for (int i=0; i<2; i++) {
+            err = Fcntl(vfd[i], F_SETFD, FD_CLOEXEC);
+            if (err) {
+                Close(vfd[0]);
+                Close(vfd[1]);
+                goto out;
+            }
+        }
+    }
+out:
+#endif
     if (err == -1)
         err = -errno;
     errno = save_errno;
     return err;
 }
 
+#ifndef _WIN32
 __Errno Sigaction(int signo, const struct ::sigaction *act, struct ::sigaction *oldact) {
     int save_errno = errno;
     int err = ::sigaction(signo, act, oldact);
@@ -143,6 +176,17 @@ __Errno Sigaction(int signo, const struct ::sigaction *act, struct ::sigaction *
     errno = save_errno;
     return err;
 }
+#endif
+
+sighandler_t Signal(int signo, sighandler_t handler, int *out_psyserr) {
+    int save_errno = errno;
+    sighandler_t oldh = ::signal(signo, handler);
+    *out_psyserr = (oldh == SIG_ERR
+        ? (errno ? -errno : -EINVAL) // windows returns SIG_ERR/errno=0 for invalid signo
+        : 0);
+    errno = save_errno;
+    return oldh;
+}
 
 
 }}} // golang::internal::syscall::

golang/runtime/internal/syscall.h

 #ifndef _NXD_LIBGOLANG_RUNTIME_INTERNAL_SYSCALL_H
 #define _NXD_LIBGOLANG_RUNTIME_INTERNAL_SYSCALL_H
 
-// Copyright (C) 2021-2022  Nexedi SA and Contributors.
+// Copyright (C) 2021-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -59,15 +59,21 @@ error NewErrno(__Errno syserr); // TODO better return Errno directly.
 
 // system calls
 
-int/*n|err*/ Read(int fd, void *buf, size_t count);
-int/*n|err*/ Write(int fd, const void *buf, size_t count);
-
-__Errno Close(int fd);
-__Errno Fcntl(int fd, int cmd, int arg);
-__Errno Fstat(int fd, struct ::stat *out_st);
-int/*fd|err*/ Open(const char *path, int flags, mode_t mode);
-__Errno Pipe(int vfd[2]);
-__Errno Sigaction(int signo, const struct ::sigaction *act, struct ::sigaction *oldact);
+LIBGOLANG_API int/*n|err*/ Read(int fd, void *buf, size_t count);
+LIBGOLANG_API int/*n|err*/ Write(int fd, const void *buf, size_t count);
+
+LIBGOLANG_API __Errno Close(int fd);
+#ifndef _WIN32
+LIBGOLANG_API __Errno Fcntl(int fd, int cmd, int arg);
+#endif
+LIBGOLANG_API __Errno Fstat(int fd, struct ::stat *out_st);
+LIBGOLANG_API int/*fd|err*/ Open(const char *path, int flags, mode_t mode);
+LIBGOLANG_API __Errno Pipe(int vfd[2], int flags);
+#ifndef _WIN32
+LIBGOLANG_API __Errno Sigaction(int signo, const struct ::sigaction *act, struct ::sigaction *oldact);
+#endif
+typedef void (*sighandler_t)(int);
+LIBGOLANG_API sighandler_t /*sigh|SIG_ERR*/ Signal(int signo, sighandler_t handler, int *out_psyserr);
 
 
 }}} // golang::internal::syscall::

golang/runtime/libgolang.cpp

-// Copyright (C) 2018-2022  Nexedi SA and Contributors.
+// Copyright (C) 2018-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -43,12 +43,23 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 
 // linux/list.h needs ARRAY_SIZE    XXX -> better use c.h or ccan/array_size.h ?
 #ifndef ARRAY_SIZE
 # define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))
 #endif
 #include <linux/list.h>
+// MSVC does not support statement expressions and typeof
+// -> redo list_entry via C++ lambda.
+#ifdef _MSC_VER
+# undef list_entry
+# define list_entry(ptr, type, member) [&]() {                      \
+        const decltype( ((type *)0)->member ) *__mptr = (ptr);      \
+        return (type *)( (char *)__mptr - offsetof(type,member) );  \
+    }()
+#endif
+
 
 using std::atomic;
 using std::bad_alloc;
@@ -899,6 +910,13 @@ template<> int _chanselect2</*onstack=*/true> (const _selcase *, int, const vect
 template<> int _chanselect2</*onstack=*/false>(const _selcase *, int, const vector<int>&);
 static int __chanselect2(const _selcase *, int, const vector<int>&, _WaitGroup*);
 
+// PRNG for select.
+// TODO consider switching to xoroshiro or wyrand if speed is an issue
+// https://thompsonsed.co.uk/random-number-generators-for-c-performance-tested
+// https://nullprogram.com/blog/2017/09/21/
+static std::random_device        _devrand;
+static thread_local std::mt19937 _t_rng(_devrand());
+
 // _chanselect executes one ready send or receive channel case.
 //
 // if no case is ready and default case was provided, select chooses default.
@@ -925,7 +943,7 @@ int _chanselect(const _selcase *casev, int casec) {
     vector<int> nv(casec); // n -> n(case)      TODO -> caller stack-allocate nv
     for (int i=0; i <casec; i++)
         nv[i] = i;
-    std::random_shuffle(nv.begin(), nv.end());
+    std::shuffle(nv.begin(), nv.end(), _t_rng);
 
     // first pass: poll all cases and bail out in the end if default was provided
     int  ndefault = -1;

golang/sync.h

 #ifndef _NXD_LIBGOLANG_SYNC_H
 #define	_NXD_LIBGOLANG_SYNC_H
 
-// Copyright (C) 2018-2020  Nexedi SA and Contributors.
+// Copyright (C) 2018-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -212,7 +212,7 @@ class _WorkGroup : public object {
 private:
     _WorkGroup();
     ~_WorkGroup();
-    friend WorkGroup NewWorkGroup(context::Context ctx);
+    friend LIBGOLANG_API WorkGroup NewWorkGroup(context::Context ctx);
 public:
     LIBGOLANG_API void decref();
 

golang/testprog/golang_test_defer_excchain.txt

 Traceback (most recent call last):
   File "PYGOLANG/golang/__init__.py", line ..., in _
     return f(*argv, **kw)
+           ^^^^^^^^^^^^^^                                       +PY311
   File "PY39(PYGOLANG/golang/testprog/)golang_test_defer_excchain.py", line 42, in main
     raise RuntimeError("err")
 RuntimeError: err
@@ -21,6 +22,7 @@ Traceback (most recent call last):
     ...
   File "PY39(PYGOLANG/golang/testprog/)golang_test_defer_excchain.py", line 33, in d2
     1/0
+    ~^~                                                         +PY311
 ZeroDivisionError: ...
 
 During handling of the above exception, another exception occurred:
@@ -30,7 +32,8 @@ Traceback (most recent call last):
     main()
   ...
   File "PYGOLANG/golang/__init__.py", line ..., in _
-    return f(*argv, **kw)
+    return f(*argv, **kw)                                       -PY310
+    with __goframe__:                                           +PY310
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__
     ...
   File "PYGOLANG/golang/__init__.py", line ..., in __exit__

golang/testprog/golang_test_defer_excchain.txt-pytest

 ...
-_____________________________________ main _____________________________________
+...________________ main ________________...
 ../__init__.py:...: in _
     return f(*argv, **kw)
 golang_test_defer_excchain.py:42: in main

golang/testprog/golang_test_str.py

 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-# Copyright (C) 2022  Nexedi SA and Contributors.
+# Copyright (C) 2022-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -29,8 +29,8 @@ from golang import b, u
 from golang.gcompat import qq
 
 def main():
-    sb = b("привет b")
-    su = u("привет u")
+    sb = b("привет αβγ b")
+    su = u("привет αβγ u")
     print("print(b):", sb)
     print("print(u):", su)
     print("print(qq(b)):", qq(sb))

golang/testprog/golang_test_str.txt

-print(b): привет b
-print(u): привет u
-print(qq(b)): "привет b"
-print(qq(u)): "привет u"
-print(repr(b)): b('привет b')
-print(repr(u)): u('привет u')
-print({b: u}): {b('привет b'): u('привет u')}
+print(b): привет αβγ b
+print(u): привет αβγ u
+print(qq(b)): "привет αβγ b"
+print(qq(u)): "привет αβγ u"
+print(repr(b)): b('привет αβγ b')
+print(repr(u)): u('привет αβγ u')
+print({b: u}): {b('привет αβγ b'): u('привет αβγ u')}

golang/time.h

 #ifndef _NXD_LIBGOLANG_TIME_H
 #define	_NXD_LIBGOLANG_TIME_H
 
-// Copyright (C) 2019-2020  Nexedi SA and Contributors.
+// Copyright (C) 2019-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -123,7 +123,7 @@ private:
 private:
     _Ticker();
     ~_Ticker();
-    friend Ticker new_ticker(double dt);
+    friend Ticker LIBGOLANG_API new_ticker(double dt);
 public:
     LIBGOLANG_API void decref();
 

gpython/__init__.py

 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-# Copyright (C) 2018-2021  Nexedi SA and Contributors.
+# Copyright (C) 2018-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -50,19 +50,27 @@ _pyopt_long = ('version',)
 # init, if provided, is called after options are parsed, but before interpreter start.
 def pymain(argv, init=None):
     import sys
-    from os.path import dirname, realpath
+    import os
+    from os.path import dirname, realpath, splitext
 
     # sys.executable
     # on windows there are
-    #   gpython-script.py
     #   gpython.exe
+    #   gpython-script.py
     #   gpython.manifest
-    # and argv[0] is gpython-script.py
+    # with gpython-script.py sometimes embedded into gpython.exe (pip/distlib)
+    # and argv[0] is 'gpython-script.py' (setuptools)  or  'gpython' (pip/distlib; note no .exe)
     exe  = realpath(argv[0])
     argv = argv[1:]
+    if os.name == 'nt':
         if exe.endswith('-script.py'):
-        exe = exe[:-len('-script.py')]
+            exe = exe[:-len('-script.py')]  # gpython-script.py  ->  gpython.exe
             exe = exe + '.exe'
+        else:
+            _, ext = splitext(exe)          # gpython            ->  gpython.exe
+            if not ext:
+                exe += '.exe'
+
     sys._gpy_underlying_executable = sys.executable
     sys.executable  = exe
 
@@ -70,20 +78,26 @@ def pymain(argv, init=None):
     # `gpython file` will add path-to-file to sys.path[0] by itself, and
     # /path/to/gpython is unnecessary and would create difference in behaviour
     # in between gpython and python.
+    #
+    # on windows when gpython.exe comes with embedded __main__.py, it is
+    # gpython.exe that is installed into sys.path[0] .
     exedir = dirname(exe)
-    if sys.path[0] == exedir:
+    if sys.path[0] in (exedir, exe):
         del sys.path[0]
     else:
         # buildout injects `sys.path[0:0] = eggs` into python scripts.
         # detect that and remove sys.path entry corresponding to exedir.
         if not _is_buildout_script(exe):
-            raise RuntimeError('pymain: internal error: sys.path[0] was not set by underlying python to dirname(exe):'
+            raise RuntimeError('pymain: internal error: sys.path[0] was not set by underlying python to dirname(exe) or exe:'
                     '\n\n\texe:\t%s\n\tsys.path[0]:\t%s' % (exe, sys.path[0]))
         else:
-            if exedir in sys.path:
-                sys.path.remove(exedir)
-            else:
-                raise RuntimeError('pymain: internal error: sys.path does not contain dirname(exe):'
+            ok = False
+            for _ in (exedir, exe):
+                if _ in sys.path:
+                    sys.path.remove(_)
+                    ok = True
+            if not ok:
+                raise RuntimeError('pymain: internal error: sys.path does not contain dirname(exe) or exe:'
                     '\n\n\texe:\t%s\n\tsys.path:\t%s' % (exe, sys.path))
 
 
@@ -202,7 +216,6 @@ def pymain(argv, init=None):
     #
     #   python -O gpython file.py
     if len(reexec_with) > 0:
-        import os
         argv = [sys._gpy_underlying_executable] + reexec_with + [sys.executable] + reexec_argv
         os.execv(argv[0], argv)
 
@@ -439,13 +452,13 @@ def main():
 
 # _is_buildout_script returns whether file @path is generated as python buildout script.
 def _is_buildout_script(path):
-    with open(path, 'r') as f:
+    with open(path, 'rb') as f:
         src = f.read()
     # buildout injects the following prologues into python scripts:
     #   sys.path[0:0] = [
     #     ...
     #   ]
-    return ('\nsys.path[0:0] = [\n' in src)
+    return (b'\nsys.path[0:0] = [\n' in src)
 
 
 # _IGetOpt provides getopt-style incremental options parsing.

gpython/gpython_test.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2019-2022  Nexedi SA and Contributors.
+# Copyright (C) 2019-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -184,7 +184,7 @@ def test_pymain():
     _ = pyout(['-m', 'hello', 'abc', 'def'], cwd=testdata)
     # realpath rewrites e.g. `local/lib -> lib` if local/lib is symlink
     hellopy = realpath(join(testdata, 'hello.py'))
-    assert _ == b"hello\nworld\n['%s', 'abc', 'def']\n" % b(hellopy)
+    assert _ == b"hello\nworld\n[%s, 'abc', 'def']\n" % b(repr(hellopy))
     # -m<module>
     __ = pyout(['-mhello', 'abc', 'def'], cwd=testdata)
     assert __ == _
@@ -195,7 +195,7 @@ def test_pymain():
 
     # -i after stdin (also tests interactive mode as -i forces interactive even on non-tty)
     d = {
-        b'hellopy': b(hellopy),
+        b'repr(hellopy)': b(repr(hellopy)),
         b'ps1':           b'' # cpython emits prompt to stderr
     }
     if is_pypy and not is_gpython:
@@ -212,7 +212,7 @@ def test_pymain():
     assert _ == b"hello\nworld\n['-c']\n%(ps1)s'~~HELLO~~'\n%(ps1)s"    % d
     # -i after -m
     _ = pyout(['-i', '-m', 'hello'], stdin=b'world.tag', cwd=testdata)
-    assert _ == b"hello\nworld\n['%(hellopy)s']\n%(ps1)s'~~WORLD~~'\n%(ps1)s"  % d
+    assert _ == b"hello\nworld\n[%(repr(hellopy))s]\n%(ps1)s'~~WORLD~~'\n%(ps1)s"  % d
     # -i after file
     _ = pyout(['-i', 'testdata/hello.py'], stdin=b'tag', cwd=here)
     assert _ == b"hello\nworld\n['testdata/hello.py']\n%(ps1)s'~~HELLO~~'\n%(ps1)s" % d

gpython/testprog/print_opt.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2020  Nexedi SA and Contributors.
+# Copyright (C) 2020-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -62,8 +62,9 @@ def modpy_imports_from():
         raise AssertionError("module 'mod' is already there")
 
     tmpd  = tempfile.mkdtemp('', 'modpy_imports_from')
+    tmpd_ = tmpd + os.path.sep
     try:
-        pymod = "%s/mod.py" % tmpd
+        pymod = tmpd_ + "mod.py"
         with open(pymod, "w") as f:
             f.write("# hello up there\n")
 
@@ -73,9 +74,9 @@ def modpy_imports_from():
         files = set()
         for dirpath, dirnames, filenames in os.walk(tmpd):
             for _ in filenames:
-                f = '%s/%s' % (dirpath, _)
-                if f.startswith(tmpd+'/'):
-                    f = f[len(tmpd+'/'):]
+                f = os.path.join(dirpath, _)
+                if f.startswith(tmpd_):
+                    f = f[len(tmpd_):]
                 files.add(f)
 
 

pyproject.toml

 [build-system]
-requires = ["setuptools", "wheel", "setuptools_dso >= 1.7", "cython", "gevent"]
+requires = ["setuptools", "wheel", "setuptools_dso >= 2.7", "cython", "gevent"]

setup.py

 # pygolang | pythonic package setup
-# Copyright (C) 2018-2022  Nexedi SA and Contributors.
+# Copyright (C) 2018-2023  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,28 +19,27 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 
 from setuptools import find_packages
-# setuptools has Library but this days it is not well supported and test for it
-# has been killed https://github.com/pypa/setuptools/commit/654c26f78a30
-# -> use setuptools_dso instead.
-from setuptools_dso import DSO
 from setuptools.command.install_scripts import install_scripts as _install_scripts
 from setuptools.command.develop import develop as _develop
 from distutils import sysconfig
 from os.path import dirname, join
-import sys, re
+import sys, os, re
 
 # read file content
-def readfile(path):
-    with open(path, 'r') as f:
-        return f.read()
-
-# reuse golang.pyx.build to build pygolang extensions.
+def readfile(path): # -> str
+    with open(path, 'rb') as f:
+        data = f.read()
+        if not isinstance(data, str):   # py3
+            data = data.decode('utf-8')
+        return data
+
+# reuse golang.pyx.build to build pygolang dso and extensions.
 # we have to be careful and inject synthetic golang package in order to be
 # able to import golang.pyx.build without built/working golang.
 trun = {}
 exec(readfile('trun'), trun)
 trun['ximport_empty_golangmod']()
-from golang.pyx.build import setup, Extension as Ext
+from golang.pyx.build import setup, DSO, Extension as Ext
 
 
 # grep searches text for pattern.
@@ -156,7 +155,7 @@ class develop(XInstallGPython, _develop):
 # requirements of packages under "golang." namespace
 R = {
     'cmd.pybench':      {'pytest'},
-    'pyx.build':        {'setuptools', 'wheel', 'cython', 'setuptools_dso >= 1.7'},
+    'pyx.build':        {'setuptools', 'wheel', 'cython', 'setuptools_dso >= 2.7'},
     'x.perf.benchlib':  {'numpy'},
 }
 # TODO generate `a.b -> a`, e.g. x.perf = join(x.perf.*); x = join(x.*)
@@ -174,6 +173,14 @@ for k in sorted(R.keys()):
     extras_require[k] = list(sorted(R[k]))
 
 
+# get_python_libdir() returns path where libpython is located
+def get_python_libdir():
+    # mimic what distutils.command.build_ext does
+    if os.name == 'nt':
+        return join(sysconfig.get_config_var('installed_platbase'), 'libs')
+    else:
+        return sysconfig.get_config_var('LIBDIR')
+
 setup(
     name        = 'pygolang',
     version     = version,
@@ -223,19 +230,17 @@ setup(
                             'golang/strings.h',
                             'golang/sync.h',
                             'golang/time.h'],
-                        include_dirs    = ['.', '3rdparty/include'],
+                        include_dirs    = ['3rdparty/include'],
                         define_macros   = [('BUILDING_LIBGOLANG', None)],
-                        extra_compile_args = ['-std=gnu++11'], # not c++11 as linux/list.h uses typeof
                         soversion       = '0.1'),
 
                     DSO('golang.runtime.libpyxruntime',
                         ['golang/runtime/libpyxruntime.cpp'],
                         depends = ['golang/pyx/runtime.h'],
-                        include_dirs    = ['.', sysconfig.get_python_inc()],
+                        include_dirs    = [sysconfig.get_python_inc()],
+                        library_dirs    = [get_python_libdir()],
                         define_macros   = [('BUILDING_LIBPYXRUNTIME', None)],
-                        extra_compile_args = ['-std=c++11'],
-                        soversion       = '0.1',
-                        dsos = ['golang.runtime.libgolang'])],
+                        soversion       = '0.1')],
 
     ext_modules = [
                     Ext('golang._golang',
@@ -311,11 +316,12 @@ setup(
     include_package_data = True,
 
     install_requires = ['gevent', 'six', 'decorator', 'Importing;python_version<="2.7"',
+                        # only runtime part: for dylink_prepare_dso
+                        'setuptools_dso >= 2.7',
                         # pyx.build -> setuptools_dso uses multiprocessing
-                        # FIXME geventmp fails on python2, but setuptools_dso
-                        # uses multiprocessing only on Python3, so for now we
-                        # are ok. https://github.com/karellen/geventmp/pull/2
-                        'geventmp;python_version>="3"',
+                        # setuptools_dso uses multiprocessing only on Python3, and only on systems where
+                        # mp.get_start_method()!='fork', while geventmp does not work on windows.
+                        'geventmp ; python_version>="3" and platform_system != "Windows" ',
                        ],
     extras_require   = extras_require,
 
@@ -345,8 +351,15 @@ setup(
         Programming Language :: Python :: 3.7
         Programming Language :: Python :: 3.8
         Programming Language :: Python :: 3.9
+        Programming Language :: Python :: 3.10
+        Programming Language :: Python :: 3.11
         Programming Language :: Python :: Implementation :: CPython
         Programming Language :: Python :: Implementation :: PyPy
+        Operating System :: POSIX
+        Operating System :: POSIX :: Linux
+        Operating System :: Unix
+        Operating System :: MacOS
+        Operating System :: Microsoft :: Windows
         Topic :: Software Development :: Interpreters
         Topic :: Software Development :: Libraries :: Python Modules\
     """.splitlines()]

tox.ini

 [tox]
 envlist =
-    {py27d,py27,py37,py38d,py38,py39d,py39,pypy,pypy3}-{thread,gevent}
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,pypy,pypy3}-{thread,gevent}
 
 
 # ThreadSanitizer
@@ -10,28 +10,31 @@ envlist =
 # (*) PyPy locks its GIL (see RPyGilAcquire) by manually doing atomic cmpxchg
 # and other games, which TSAN cannot see if PyPy itself was not compiled with
 # -fsanitize=thread.
-    {py27d,py27,py37,py38d,py38,py39d,py39           }-{thread       }-tsan
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311           }-{thread       }-tsan
 # XXX py*-gevent-tsan would be nice to have, but at present TSAN is not
 # effective with gevent, because it does not understand greenlet "thread"
 # switching and so perceives the program as having only one thread where races
 # are impossible. Disabled to save time.
-#   {py27d,py27,py37,py38d,py38,py39d,py39           }-{       gevent}-tsan
+#   {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311           }-{       gevent}-tsan
 
 
 # AddressSanitizer
 
 # XXX asan does not work with gevent: https://github.com/python-greenlet/greenlet/issues/113
-    {py27d,py27,py37,py38d,py38,py39d,py39,pypy,pypy3}-{thread       }-asan
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,pypy,pypy3}-{thread       }-asan
 
 [testenv]
 basepython =
     py27d:  python2.7-dbg
     py27:   python2.7
     py37:   python3.7
-    py38d:  python3.8-dbg
     py38:   python3.8
     py39d:  python3.9-dbg
     py39:   python3.9
+    py310d: python3.10-dbg
+    py310:  python3.10
+    py311d: python3.11-dbg
+    py311:  python3.11
     pypy:   pypy
     pypy3:  pypy3
 
@@ -69,5 +72,5 @@ commands=
 # asan/tsan: tell pytest not to capture output - else it is not possible to see
 # reports from sanitizers because they crash tested process on error.
 # likewise for python debug builds.
-        asan,tsan,py{27,37}d: -s    \
+        asan,tsan,py{27,39,310,311}d: -s    \
         gpython/ golang/