1 files changed, 40 insertions, 0 deletions
diff --git a/src/sync/runtime.go b/src/sync/runtime.go
new file mode 100644
index 000000000..3b866303a
--- /dev/null
+++ b/src/sync/runtime.go
@@ -0,0 +1,40 @@
+// Copyright 2012 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 "unsafe"
+
+// defined in package runtime
+
+// Semacquire waits until *s > 0 and then atomically decrements it.
+// It is intended as a simple sleep primitive for use by the synchronization
+// library and should not be used directly.
+func runtime_Semacquire(s *uint32)
+
+// Semrelease atomically increments *s and notifies a waiting goroutine
+// if one is blocked in Semacquire.
+// It is intended as a simple wakeup primitive for use by the synchronization
+// library and should not be used directly.
+func runtime_Semrelease(s *uint32)
+
+// Approximation of syncSema in runtime/sema.go.
+type syncSema struct {
+	lock uintptr
+	head unsafe.Pointer
+	tail unsafe.Pointer
+}
+
+// Syncsemacquire waits for a pairing Syncsemrelease on the same semaphore s.
+func runtime_Syncsemacquire(s *syncSema)
+
+// Syncsemrelease waits for n pairing Syncsemacquire on the same semaphore s.
+func runtime_Syncsemrelease(s *syncSema, n uint32)
+
+// Ensure that sync and runtime agree on size of syncSema.
+func runtime_Syncsemcheck(size uintptr)
+func init() {
+	var s syncSema
+	runtime_Syncsemcheck(unsafe.Sizeof(s))
+}