update mod

vendor/github.com/siddontang/go/sync2/atomic.go

@@ -0,0 +1,146 @@
+// 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"
+	"sync/atomic"
+	"time"
+)
+
+type AtomicInt32 int32
+
+func (i *AtomicInt32) Add(n int32) int32 {
+	return atomic.AddInt32((*int32)(i), n)
+}
+
+func (i *AtomicInt32) Set(n int32) {
+	atomic.StoreInt32((*int32)(i), n)
+}
+
+func (i *AtomicInt32) Get() int32 {
+	return atomic.LoadInt32((*int32)(i))
+}
+
+func (i *AtomicInt32) CompareAndSwap(oldval, newval int32) (swapped bool) {
+	return atomic.CompareAndSwapInt32((*int32)(i), oldval, newval)
+}
+
+type AtomicUint32 uint32
+
+func (i *AtomicUint32) Add(n uint32) uint32 {
+	return atomic.AddUint32((*uint32)(i), n)
+}
+
+func (i *AtomicUint32) Set(n uint32) {
+	atomic.StoreUint32((*uint32)(i), n)
+}
+
+func (i *AtomicUint32) Get() uint32 {
+	return atomic.LoadUint32((*uint32)(i))
+}
+
+func (i *AtomicUint32) CompareAndSwap(oldval, newval uint32) (swapped bool) {
+	return atomic.CompareAndSwapUint32((*uint32)(i), oldval, newval)
+}
+
+type AtomicInt64 int64
+
+func (i *AtomicInt64) Add(n int64) int64 {
+	return atomic.AddInt64((*int64)(i), n)
+}
+
+func (i *AtomicInt64) Set(n int64) {
+	atomic.StoreInt64((*int64)(i), n)
+}
+
+func (i *AtomicInt64) Get() int64 {
+	return atomic.LoadInt64((*int64)(i))
+}
+
+func (i *AtomicInt64) CompareAndSwap(oldval, newval int64) (swapped bool) {
+	return atomic.CompareAndSwapInt64((*int64)(i), oldval, newval)
+}
+
+type AtomicUint64 uint64
+
+func (i *AtomicUint64) Add(n uint64) uint64 {
+	return atomic.AddUint64((*uint64)(i), n)
+}
+
+func (i *AtomicUint64) Set(n uint64) {
+	atomic.StoreUint64((*uint64)(i), n)
+}
+
+func (i *AtomicUint64) Get() uint64 {
+	return atomic.LoadUint64((*uint64)(i))
+}
+
+func (i *AtomicUint64) CompareAndSwap(oldval, newval uint64) (swapped bool) {
+	return atomic.CompareAndSwapUint64((*uint64)(i), oldval, newval)
+}
+
+type AtomicDuration int64
+
+func (d *AtomicDuration) Add(duration time.Duration) time.Duration {
+	return time.Duration(atomic.AddInt64((*int64)(d), int64(duration)))
+}
+
+func (d *AtomicDuration) Set(duration time.Duration) {
+	atomic.StoreInt64((*int64)(d), int64(duration))
+}
+
+func (d *AtomicDuration) Get() time.Duration {
+	return time.Duration(atomic.LoadInt64((*int64)(d)))
+}
+
+func (d *AtomicDuration) CompareAndSwap(oldval, newval time.Duration) (swapped bool) {
+	return atomic.CompareAndSwapInt64((*int64)(d), int64(oldval), int64(newval))
+}
+
+// AtomicString gives you atomic-style APIs for string, but
+// it's only a convenience wrapper that uses a mutex. So, it's
+// not as efficient as the rest of the atomic types.
+type AtomicString struct {
+	mu  sync.Mutex
+	str string
+}
+
+func (s *AtomicString) Set(str string) {
+	s.mu.Lock()
+	s.str = str
+	s.mu.Unlock()
+}
+
+func (s *AtomicString) Get() string {
+	s.mu.Lock()
+	str := s.str
+	s.mu.Unlock()
+	return str
+}
+
+func (s *AtomicString) CompareAndSwap(oldval, newval string) (swapped bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.str == oldval {
+		s.str = newval
+		return true
+	}
+	return false
+}
+
+type AtomicBool int32
+
+func (b *AtomicBool) Set(v bool) {
+	if v {
+		atomic.StoreInt32((*int32)(b), 1)
+	} else {
+		atomic.StoreInt32((*int32)(b), 0)
+	}
+}
+
+func (b *AtomicBool) Get() bool {
+	return atomic.LoadInt32((*int32)(b)) == 1
+}

vendor/github.com/siddontang/go/sync2/semaphore.go

@@ -0,0 +1,65 @@
+package sync2
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+func NewSemaphore(initialCount int) *Semaphore {
+	res := &Semaphore{
+		counter: int64(initialCount),
+	}
+	res.cond.L = &res.lock
+	return res
+}
+
+type Semaphore struct {
+	lock    sync.Mutex
+	cond    sync.Cond
+	counter int64
+}
+
+func (s *Semaphore) Release() {
+	s.lock.Lock()
+	s.counter += 1
+	if s.counter >= 0 {
+		s.cond.Signal()
+	}
+	s.lock.Unlock()
+}
+
+func (s *Semaphore) Acquire() {
+	s.lock.Lock()
+	for s.counter < 1 {
+		s.cond.Wait()
+	}
+	s.counter -= 1
+	s.lock.Unlock()
+}
+
+func (s *Semaphore) AcquireTimeout(timeout time.Duration) bool {
+	done := make(chan bool, 1)
+	// Gate used to communicate between the threads and decide what the result
+	// is. If the main thread decides, we have timed out, otherwise we succeed.
+	decided := new(int32)
+	go func() {
+		s.Acquire()
+		if atomic.SwapInt32(decided, 1) == 0 {
+			done <- true
+		} else {
+			// If we already decided the result, and this thread did not win
+			s.Release()
+		}
+	}()
+	select {
+	case <-done:
+		return true
+	case <-time.NewTimer(timeout).C:
+		if atomic.SwapInt32(decided, 1) == 1 {
+			// The other thread already decided the result
+			return true
+		}
+		return false
+	}
+}