MDEV-4174 - Use kqueue for threadpool implementation on more BSD variants than just FreeBSD

or OSX - i.e NetBSD, OpenBSD, DragonFly, etc.

cmake/os/WindowsCache.cmake

@@ -267,6 +267,7 @@ SET(HAVE_SYNCH_H CACHE  INTERNAL "")
 SET(HAVE_SYSENT_H CACHE  INTERNAL "")
 SET(HAVE_SYS_CDEFS_H CACHE  INTERNAL "")
 SET(HAVE_SYS_DIR_H CACHE  INTERNAL "")
+SET(HAVE_SYS_EVENT_H CACHE  INTERNAL "")
 SET(HAVE_SYS_ERRLIST CACHE  INTERNAL "")
 SET(HAVE_SYS_FILE_H CACHE  INTERNAL "")
 SET(HAVE_SYS_FPU_H CACHE  INTERNAL "")

config.h.cmake

@@ -45,6 +45,7 @@
 #cmakedefine HAVE_IA64INTRIN_H 1
 #cmakedefine HAVE_IEEEFP_H 1
 #cmakedefine HAVE_INTTYPES_H 1
+#cmakedefine HAVE_KQUEUE 1
 #cmakedefine HAVE_LIMITS_H 1
 #cmakedefine HAVE_LINUX_UNISTD_H 1
 #cmakedefine HAVE_LOCALE_H 1

configure.cmake

@@ -217,6 +217,7 @@ CHECK_INCLUDE_FILES (sched.h HAVE_SCHED_H)
 CHECK_INCLUDE_FILES (select.h HAVE_SELECT_H)
 CHECK_INCLUDE_FILES (semaphore.h HAVE_SEMAPHORE_H)
 CHECK_INCLUDE_FILES ("sys/types.h;sys/dir.h" HAVE_SYS_DIR_H)
+CHECK_INCLUDE_FILES ("sys/types.h;sys/event.h" HAVE_SYS_EVENT_H)
 CHECK_INCLUDE_FILES (sys/ndir.h HAVE_SYS_NDIR_H)
 CHECK_INCLUDE_FILES (sys/pte.h HAVE_SYS_PTE_H)
 CHECK_INCLUDE_FILES (stddef.h HAVE_STDDEF_H)
@@ -466,6 +467,10 @@ CHECK_FUNCTION_EXISTS (memalign HAVE_MEMALIGN)
 CHECK_FUNCTION_EXISTS (chown HAVE_CHOWN)
 CHECK_FUNCTION_EXISTS (nl_langinfo HAVE_NL_LANGINFO)
 
+IF(HAVE_SYS_EVENT_H)
+CHECK_FUNCTION_EXISTS (kqueue HAVE_KQUEUE)
+ENDIF()
+
 #--------------------------------------------------------------------
 # Support for WL#2373 (Use cycle counter for timing)
 #--------------------------------------------------------------------

sql/threadpool_unix.cc

@@ -29,14 +29,14 @@
 #ifdef __linux__
 #include <sys/epoll.h>
 typedef struct epoll_event native_event;
-#endif
-#if defined (__FreeBSD__) || defined (__APPLE__)
+#elif defined(HAVE_KQUEUE)
 #include <sys/event.h>
 typedef struct kevent native_event;
-#endif
-#if defined (__sun)
+#elif defined (__sun)
 #include <port.h>
 typedef port_event_t native_event;
+#else
+#error threadpool is not available on this platform
 #endif
 
 /** Maximum number of native events a listener can read in one go */
@@ -285,7 +285,7 @@ static void *native_event_get_userdata(native_event *event)
   return event->data.ptr;
 }
 
-#elif defined (__FreeBSD__) || defined (__APPLE__)
+#elif defined(HAVE_KQUEUE)
 int io_poll_create()
 {
   return kqueue();
@@ -386,8 +386,6 @@ static void* native_event_get_userdata(native_event *event)
 {
   return event->portev_user;
 }
-#else
-#error not ported yet to this OS
 #endif