1 files changed, 35 insertions, 0 deletions
diff --git a/libgo/go/sync/once.go b/libgo/go/sync/once.go
new file mode 100644
index 000000000..8c877cdec
--- /dev/null
+++ b/libgo/go/sync/once.go
@@ -0,0 +1,35 @@
+// 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
+
+// Once is an object that will perform exactly one action.
+type Once struct {
+	m    Mutex
+	done bool
+}
+
+// Do calls the function f if and only if the method is being called for the
+// first time with this receiver.  In other words, given
+// 	var once Once
+// if 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()) {
+	o.m.Lock()
+	defer o.m.Unlock()
+	if !o.done {
+		o.done = true
+		f()
+	}
+}