delete pkg/once

R=rsc
CC=golang-dev
https://golang.org/cl/1995041

src/pkg/Makefile

@@ -100,7 +100,6 @@ DIRS=\
 	net/textproto\
 	netchan\
 	nntp\
-	once\
 	os\
 	os/signal\
 	patch\

src/pkg/once/Makefile

-# Copyright 2009 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-include ../../Make.$(GOARCH)
-
-TARG=once
-GOFILES=\
-	once.go\
-
-include ../../Make.pkg

src/pkg/once/once.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This package provides a single function, Do, to run a function
-// exactly once, usually used as part of initialization.
-package once
-
-import "sync"
-
-type job struct {
-	done       bool
-	sync.Mutex // should probably be sync.Notification or some such
-}
-
-var jobs = make(map[func()]*job)
-var joblock sync.Mutex
-
-// Do is the the only exported piece of the package.
-// For one-time initialization that is not done during init,
-// wrap the initialization in a niladic function f() and call
-//	Do(f)
-// If multiple processes call Do(f) simultaneously
-// with the same f argument, only one will call f, and the
-// others will block until f finishes running.
-//
-// Since a func() expression typically evaluates to a differerent
-// function value each time it is evaluated, it is incorrect to
-// pass such values to Do.  For example,
-//	func f(x int) {
-//		Do(func() { fmt.Println(x) })
-//	}
-// behaves the same as
-//	func f(x int) {
-//		fmt.Println(x)
-//	}
-// because the func() expression in the first creates a new
-// func each time f runs, and each of those funcs is run once.
-func Do(f func()) {
-	joblock.Lock()
-	j := jobs[f]
-	if j == nil {
-		// run it
-		j = new(job)
-		j.Lock()
-		jobs[f] = j
-		joblock.Unlock()
-		f()
-		j.done = true
-		j.Unlock()
-	} else {
-		// wait for it
-		joblock.Unlock()
-		if j.done != true {
-			j.Lock()
-			j.Unlock()
-		}
-	}
-}

src/pkg/once/once_test.go

-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package once_test
-
-import (
-	"once"
-	"testing"
-)
-
-var ncall int
-
-func call() { ncall++ }
-
-func TestDo(t *testing.T) {
-	ncall = 0
-	once.Do(call)
-	if ncall != 1 {
-		t.Fatalf("once.Do(call) didn't call(): ncall=%d", ncall)
-	}
-	once.Do(call)
-	if ncall != 1 {
-		t.Fatalf("second once.Do(call) did call(): ncall=%d", ncall)
-	}
-	once.Do(call)
-	if ncall != 1 {
-		t.Fatalf("third once.Do(call) did call(): ncall=%d", ncall)
-	}
-}

test/garbage/parser.go

@@ -185,7 +185,6 @@ var packages = []string{
 	"mime",
 	"net",
 	"nntp",
-	"once",
 	"os",
 	"os/signal",
 	"patch",