libgo/go/sync/runtime.go

   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 // skipframes is the number of frames to omit during tracing, counting from
  19 // runtime_SemacquireMutex's caller.
  20 func 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.
  29 func runtime_Semrelease(s *uint32, handoff bool, skipframes int)
  30
  31 // See runtime/sema.go for documentation.
  32 func runtime_notifyListAdd(l *notifyList) uint32
  33
  34 // See runtime/sema.go for documentation.
  35 func runtime_notifyListWait(l *notifyList, t uint32)
  36
  37 // See runtime/sema.go for documentation.
  38 func runtime_notifyListNotifyAll(l *notifyList)
  39
  40 // See runtime/sema.go for documentation.
  41 func runtime_notifyListNotifyOne(l *notifyList)
  42
  43 // Ensure that sync and runtime agree on size of notifyList.
  44 func runtime_notifyListCheck(size uintptr)
  45 func 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.
  52 func runtime_canSpin(i int) bool
  53
  54 // runtime_doSpin does active spinning.
  55 func runtime_doSpin()
  56
  57 func runtime_nanotime() int64