Imported Upstream version 1.4upstream/1.4

1 files changed, 0 insertions, 43 deletions

diff --git a/src/pkg/sync/once.go b/src/pkg/sync/once.go
deleted file mode 100644
index 161ae3b3e..000000000
--- a/src/pkg/sync/once.go
+++ /dev/null
@@ -1,43 +0,0 @@
-// 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 sync
-
-import (
-	"sync/atomic"
-)
-
-// Once is an object that will perform exactly one action.
-type Once struct {
-	m    Mutex
-	done uint32
-}
-
-// Do calls the function f if and only if Do is being called for the
-// first time for this instance of Once.  In other words, given
-// 	var once Once
-// if once.Do(f) is called multiple times, only the first call will invoke f,
-// even if f has a different value in each invocation.  A new instance of
-// Once is required for each function to execute.
-//
-// Do is intended for initialization that must be run exactly once.  Since f
-// is niladic, it may be necessary to use a function literal to capture the
-// arguments to a function to be invoked by Do:
-// 	config.once.Do(func() { config.init(filename) })
-//
-// Because no call to Do returns until the one call to f returns, if f causes
-// Do to be called, it will deadlock.
-//
-func (o *Once) Do(f func()) {
-	if atomic.LoadUint32(&o.done) == 1 {
-		return
-	}
-	// Slow-path.
-	o.m.Lock()
-	defer o.m.Unlock()
-	if o.done == 0 {
-		f()
-		atomic.StoreUint32(&o.done, 1)
-	}
-}