1// Copyright 2012 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package sync
6
7import "unsafe"
8
9// defined in package runtime
10
11// Semacquire waits until *s > 0 and then atomically decrements it.
12// It is intended as a simple sleep primitive for use by the synchronization
13// library and should not be used directly.
14func runtime_Semacquire(s *uint32)
15
16// SemacquireMutex is like Semacquire, but for profiling contended Mutexes.
17// If lifo is true, queue waiter at the head of wait queue.
18// skipframes is the number of frames to omit during tracing, counting from
19// runtime_SemacquireMutex's caller.
20func runtime_SemacquireMutex(s *uint32, lifo bool, skipframes int)
21
22// Semrelease atomically increments *s and notifies a waiting goroutine
23// if one is blocked in Semacquire.
24// It is intended as a simple wakeup primitive for use by the synchronization
25// library and should not be used directly.
26// If handoff is true, pass count directly to the first waiter.
27// skipframes is the number of frames to omit during tracing, counting from
28// runtime_Semrelease's caller.
29func runtime_Semrelease(s *uint32, handoff bool, skipframes int)
30
31// See runtime/sema.go for documentation.
32func runtime_notifyListAdd(l *notifyList) uint32
33
34// See runtime/sema.go for documentation.
35func runtime_notifyListWait(l *notifyList, t uint32)
36
37// See runtime/sema.go for documentation.
38func runtime_notifyListNotifyAll(l *notifyList)
39
40// See runtime/sema.go for documentation.
41func runtime_notifyListNotifyOne(l *notifyList)
42
43// Ensure that sync and runtime agree on size of notifyList.
44func runtime_notifyListCheck(size uintptr)
45func init() {
46	var n notifyList
47	runtime_notifyListCheck(unsafe.Sizeof(n))
48}
49
50// Active spinning runtime support.
51// runtime_canSpin reports whether spinning makes sense at the moment.
52func runtime_canSpin(i int) bool
53
54// runtime_doSpin does active spinning.
55func runtime_doSpin()
56
57func runtime_nanotime() int64
58