Source file src/sync/runtime.go

Documentation: sync

     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  // Approximation of notifyList in runtime/sema.go. Size and alignment must
    32  // agree.
    33  type notifyList struct {
    34  	wait   uint32
    35  	notify uint32
    36  	lock   uintptr
    37  	head   unsafe.Pointer
    38  	tail   unsafe.Pointer
    39  }
    40  
    41  // See runtime/sema.go for documentation.
    42  func runtime_notifyListAdd(l *notifyList) uint32
    43  
    44  // See runtime/sema.go for documentation.
    45  func runtime_notifyListWait(l *notifyList, t uint32)
    46  
    47  // See runtime/sema.go for documentation.
    48  func runtime_notifyListNotifyAll(l *notifyList)
    49  
    50  // See runtime/sema.go for documentation.
    51  func runtime_notifyListNotifyOne(l *notifyList)
    52  
    53  // Ensure that sync and runtime agree on size of notifyList.
    54  func runtime_notifyListCheck(size uintptr)
    55  func init() {
    56  	var n notifyList
    57  	runtime_notifyListCheck(unsafe.Sizeof(n))
    58  }
    59  
    60  // Active spinning runtime support.
    61  // runtime_canSpin reports whether spinning makes sense at the moment.
    62  func runtime_canSpin(i int) bool
    63  
    64  // runtime_doSpin does active spinning.
    65  func runtime_doSpin()
    66  
    67  func runtime_nanotime() int64
    68  

View as plain text