// 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 

// 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( *uint32)

// SemacquireMutex is like Semacquire, but for profiling contended Mutexes.
// If lifo is true, queue waiter at the head of wait queue.
// skipframes is the number of frames to omit during tracing, counting from
// runtime_SemacquireMutex's caller.
func runtime_SemacquireMutex( *uint32,  bool,  int)

// 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.
// If handoff is true, pass count directly to the first waiter.
// skipframes is the number of frames to omit during tracing, counting from
// runtime_Semrelease's caller.
func runtime_Semrelease( *uint32,  bool,  int)

// See runtime/sema.go for documentation.
func runtime_notifyListAdd( *notifyList) uint32

// See runtime/sema.go for documentation.
func runtime_notifyListWait( *notifyList,  uint32)

// See runtime/sema.go for documentation.
func runtime_notifyListNotifyAll( *notifyList)

// See runtime/sema.go for documentation.
func runtime_notifyListNotifyOne( *notifyList)

// Ensure that sync and runtime agree on size of notifyList.
func runtime_notifyListCheck( uintptr)
func init() {
	var  notifyList
	runtime_notifyListCheck(unsafe.Sizeof())
}

// Active spinning runtime support.
// runtime_canSpin reports whether spinning makes sense at the moment.
func runtime_canSpin( int) bool

// runtime_doSpin does active spinning.
func runtime_doSpin()

func runtime_nanotime() int64