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 5 package sync 6 7 import "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. 14 func 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 func runtime_SemacquireMutex(s *uint32, lifo bool) 19 20 // Semrelease atomically increments *s and notifies a waiting goroutine 21 // if one is blocked in Semacquire. 22 // It is intended as a simple wakeup primitive for use by the synchronization 23 // library and should not be used directly. 24 // If handoff is true, pass count directly to the first waiter. 25 func runtime_Semrelease(s *uint32, handoff bool) 26 27 // Approximation of notifyList in runtime/sema.go. Size and alignment must 28 // agree. 29 type notifyList struct { 30 wait uint32 31 notify uint32 32 lock uintptr 33 head unsafe.Pointer 34 tail unsafe.Pointer 35 } 36 37 // See runtime/sema.go for documentation. 38 func runtime_notifyListAdd(l *notifyList) uint32 39 40 // See runtime/sema.go for documentation. 41 func runtime_notifyListWait(l *notifyList, t uint32) 42 43 // See runtime/sema.go for documentation. 44 func runtime_notifyListNotifyAll(l *notifyList) 45 46 // See runtime/sema.go for documentation. 47 func runtime_notifyListNotifyOne(l *notifyList) 48 49 // Ensure that sync and runtime agree on size of notifyList. 50 func runtime_notifyListCheck(size uintptr) 51 func init() { 52 var n notifyList 53 runtime_notifyListCheck(unsafe.Sizeof(n)) 54 } 55 56 // Active spinning runtime support. 57 // runtime_canSpin returns true is spinning makes sense at the moment. 58 func runtime_canSpin(i int) bool 59 60 // runtime_doSpin does active spinning. 61 func runtime_doSpin() 62 63 func runtime_nanotime() int64 64
