gitea/vendor/github.com/ngaut/sync2/cond.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

57 lines
877 B
Go

// Copyright 2013, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sync2
import (
"sync"
)
// Cond is an alternate implementation of sync.Cond
type Cond struct {
L sync.Locker
sema chan struct{}
waiters AtomicInt64
}
func NewCond(l sync.Locker) *Cond {
return &Cond{L: l, sema: make(chan struct{})}
}
func (c *Cond) Wait() {
c.waiters.Add(1)
c.L.Unlock()
<-c.sema
c.L.Lock()
}
func (c *Cond) Signal() {
for {
w := c.waiters.Get()
if w == 0 {
return
}
if c.waiters.CompareAndSwap(w, w-1) {
break
}
}
c.sema <- struct{}{}
}
func (c *Cond) Broadcast() {
var w int64
for {
w = c.waiters.Get()
if w == 0 {
return
}
if c.waiters.CompareAndSwap(w, 0) {
break
}
}
for i := int64(0); i < w; i++ {
c.sema <- struct{}{}
}
}