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astaxie
146
vendor/github.com/siddontang/go/sync2/atomic.go
generated
vendored
146
vendor/github.com/siddontang/go/sync2/atomic.go
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// Copyright 2013, Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sync2
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import (
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"sync"
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"sync/atomic"
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"time"
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)
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type AtomicInt32 int32
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func (i *AtomicInt32) Add(n int32) int32 {
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return atomic.AddInt32((*int32)(i), n)
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}
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func (i *AtomicInt32) Set(n int32) {
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atomic.StoreInt32((*int32)(i), n)
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}
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func (i *AtomicInt32) Get() int32 {
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return atomic.LoadInt32((*int32)(i))
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}
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func (i *AtomicInt32) CompareAndSwap(oldval, newval int32) (swapped bool) {
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return atomic.CompareAndSwapInt32((*int32)(i), oldval, newval)
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}
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type AtomicUint32 uint32
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func (i *AtomicUint32) Add(n uint32) uint32 {
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return atomic.AddUint32((*uint32)(i), n)
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}
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func (i *AtomicUint32) Set(n uint32) {
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atomic.StoreUint32((*uint32)(i), n)
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}
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func (i *AtomicUint32) Get() uint32 {
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return atomic.LoadUint32((*uint32)(i))
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}
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func (i *AtomicUint32) CompareAndSwap(oldval, newval uint32) (swapped bool) {
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return atomic.CompareAndSwapUint32((*uint32)(i), oldval, newval)
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}
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type AtomicInt64 int64
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func (i *AtomicInt64) Add(n int64) int64 {
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return atomic.AddInt64((*int64)(i), n)
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}
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func (i *AtomicInt64) Set(n int64) {
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atomic.StoreInt64((*int64)(i), n)
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}
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func (i *AtomicInt64) Get() int64 {
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return atomic.LoadInt64((*int64)(i))
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}
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func (i *AtomicInt64) CompareAndSwap(oldval, newval int64) (swapped bool) {
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return atomic.CompareAndSwapInt64((*int64)(i), oldval, newval)
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}
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type AtomicUint64 uint64
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func (i *AtomicUint64) Add(n uint64) uint64 {
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return atomic.AddUint64((*uint64)(i), n)
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}
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func (i *AtomicUint64) Set(n uint64) {
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atomic.StoreUint64((*uint64)(i), n)
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}
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func (i *AtomicUint64) Get() uint64 {
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return atomic.LoadUint64((*uint64)(i))
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}
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func (i *AtomicUint64) CompareAndSwap(oldval, newval uint64) (swapped bool) {
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return atomic.CompareAndSwapUint64((*uint64)(i), oldval, newval)
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}
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type AtomicDuration int64
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func (d *AtomicDuration) Add(duration time.Duration) time.Duration {
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return time.Duration(atomic.AddInt64((*int64)(d), int64(duration)))
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}
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func (d *AtomicDuration) Set(duration time.Duration) {
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atomic.StoreInt64((*int64)(d), int64(duration))
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}
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func (d *AtomicDuration) Get() time.Duration {
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return time.Duration(atomic.LoadInt64((*int64)(d)))
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}
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func (d *AtomicDuration) CompareAndSwap(oldval, newval time.Duration) (swapped bool) {
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return atomic.CompareAndSwapInt64((*int64)(d), int64(oldval), int64(newval))
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}
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// AtomicString gives you atomic-style APIs for string, but
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// it's only a convenience wrapper that uses a mutex. So, it's
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// not as efficient as the rest of the atomic types.
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type AtomicString struct {
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mu sync.Mutex
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str string
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}
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func (s *AtomicString) Set(str string) {
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s.mu.Lock()
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s.str = str
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s.mu.Unlock()
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}
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func (s *AtomicString) Get() string {
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s.mu.Lock()
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str := s.str
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s.mu.Unlock()
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return str
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}
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func (s *AtomicString) CompareAndSwap(oldval, newval string) (swapped bool) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.str == oldval {
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s.str = newval
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return true
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}
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return false
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}
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type AtomicBool int32
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func (b *AtomicBool) Set(v bool) {
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if v {
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atomic.StoreInt32((*int32)(b), 1)
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} else {
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atomic.StoreInt32((*int32)(b), 0)
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}
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}
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func (b *AtomicBool) Get() bool {
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return atomic.LoadInt32((*int32)(b)) == 1
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}
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65
vendor/github.com/siddontang/go/sync2/semaphore.go
generated
vendored
65
vendor/github.com/siddontang/go/sync2/semaphore.go
generated
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@ -1,65 +0,0 @@
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package sync2
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import (
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"sync"
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"sync/atomic"
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"time"
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)
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func NewSemaphore(initialCount int) *Semaphore {
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res := &Semaphore{
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counter: int64(initialCount),
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}
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res.cond.L = &res.lock
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return res
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}
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type Semaphore struct {
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lock sync.Mutex
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cond sync.Cond
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counter int64
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}
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func (s *Semaphore) Release() {
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s.lock.Lock()
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s.counter += 1
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if s.counter >= 0 {
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s.cond.Signal()
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}
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s.lock.Unlock()
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}
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func (s *Semaphore) Acquire() {
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s.lock.Lock()
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for s.counter < 1 {
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s.cond.Wait()
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}
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s.counter -= 1
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s.lock.Unlock()
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}
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func (s *Semaphore) AcquireTimeout(timeout time.Duration) bool {
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done := make(chan bool, 1)
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// Gate used to communicate between the threads and decide what the result
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// is. If the main thread decides, we have timed out, otherwise we succeed.
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decided := new(int32)
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go func() {
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s.Acquire()
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if atomic.SwapInt32(decided, 1) == 0 {
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done <- true
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} else {
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// If we already decided the result, and this thread did not win
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s.Release()
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}
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}()
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select {
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case <-done:
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return true
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case <-time.NewTimer(timeout).C:
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if atomic.SwapInt32(decided, 1) == 1 {
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// The other thread already decided the result
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return true
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}
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return false
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}
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}
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