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

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