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 func runtime_SemacquireMutex(*uint32)
  18
  19 // Semrelease atomically increments *s and notifies a waiting goroutine
  20 // if one is blocked in Semacquire.
  21 // It is intended as a simple wakeup primitive for use by the synchronization
  22 // library and should not be used directly.
  23 func runtime_Semrelease(s *uint32)
  24
  25 // Approximation of notifyList in runtime/sema.go. Size and alignment must
  26 // agree.
  27 type notifyList struct {
  28         wait   uint32
  29         notify uint32
  30         lock   uintptr
  31         head   unsafe.Pointer
  32         tail   unsafe.Pointer
  33 }
  34
  35 // See runtime/sema.go for documentation.
  36 func runtime_notifyListAdd(l *notifyList) uint32
  37
  38 // See runtime/sema.go for documentation.
  39 func runtime_notifyListWait(l *notifyList, t uint32)
  40
  41 // See runtime/sema.go for documentation.
  42 func runtime_notifyListNotifyAll(l *notifyList)
  43
  44 // See runtime/sema.go for documentation.
  45 func runtime_notifyListNotifyOne(l *notifyList)
  46
  47 // Ensure that sync and runtime agree on size of notifyList.
  48 func runtime_notifyListCheck(size uintptr)
  49 func init() {
  50         var n notifyList
  51         runtime_notifyListCheck(unsafe.Sizeof(n))
  52 }
  53
  54 // Active spinning runtime support.
  55 // runtime_canSpin returns true is spinning makes sense at the moment.
  56 func runtime_canSpin(i int) bool
  57
  58 // runtime_doSpin does active spinning.
  59 func runtime_doSpin()