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atomic.go
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atomic.go
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// 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"
)
// AtomicInt32 is a wrapper with a simpler interface around atomic.(Add|Store|Load|CompareAndSwap)Int32 functions.
type AtomicInt32 struct {
int32
}
// NewAtomicInt32 initializes a new AtomicInt32 with a given value.
func NewAtomicInt32(n int32) AtomicInt32 {
return AtomicInt32{n}
}
// Add atomically adds n to the value.
func (i *AtomicInt32) Add(n int32) int32 {
return atomic.AddInt32(&i.int32, n)
}
// Set atomically sets n as new value.
func (i *AtomicInt32) Set(n int32) {
atomic.StoreInt32(&i.int32, n)
}
// Get atomically returns the current value.
func (i *AtomicInt32) Get() int32 {
return atomic.LoadInt32(&i.int32)
}
// CompareAndSwap atomatically swaps the old with the new value.
func (i *AtomicInt32) CompareAndSwap(oldval, newval int32) (swapped bool) {
return atomic.CompareAndSwapInt32(&i.int32, oldval, newval)
}
// AtomicInt64 is a wrapper with a simpler interface around atomic.(Add|Store|Load|CompareAndSwap)Int64 functions.
type AtomicInt64 struct {
int64
}
// NewAtomicInt64 initializes a new AtomicInt64 with a given value.
func NewAtomicInt64(n int64) AtomicInt64 {
return AtomicInt64{n}
}
// Add atomically adds n to the value.
func (i *AtomicInt64) Add(n int64) int64 {
return atomic.AddInt64(&i.int64, n)
}
// Set atomically sets n as new value.
func (i *AtomicInt64) Set(n int64) {
atomic.StoreInt64(&i.int64, n)
}
// Get atomically returns the current value.
func (i *AtomicInt64) Get() int64 {
return atomic.LoadInt64(&i.int64)
}
// CompareAndSwap atomatically swaps the old with the new value.
func (i *AtomicInt64) CompareAndSwap(oldval, newval int64) (swapped bool) {
return atomic.CompareAndSwapInt64(&i.int64, oldval, newval)
}
// AtomicDuration is a wrapper with a simpler interface around atomic.(Add|Store|Load|CompareAndSwap)Int64 functions.
type AtomicDuration struct {
int64
}
// NewAtomicDuration initializes a new AtomicDuration with a given value.
func NewAtomicDuration(duration time.Duration) AtomicDuration {
return AtomicDuration{int64(duration)}
}
// Add atomically adds duration to the value.
func (d *AtomicDuration) Add(duration time.Duration) time.Duration {
return time.Duration(atomic.AddInt64(&d.int64, int64(duration)))
}
// Set atomically sets duration as new value.
func (d *AtomicDuration) Set(duration time.Duration) {
atomic.StoreInt64(&d.int64, int64(duration))
}
// Get atomically returns the current value.
func (d *AtomicDuration) Get() time.Duration {
return time.Duration(atomic.LoadInt64(&d.int64))
}
// CompareAndSwap atomatically swaps the old with the new value.
func (d *AtomicDuration) CompareAndSwap(oldval, newval time.Duration) (swapped bool) {
return atomic.CompareAndSwapInt64(&d.int64, 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
}
// Set atomically sets str as new value.
func (s *AtomicString) Set(str string) {
s.mu.Lock()
s.str = str
s.mu.Unlock()
}
// Get atomically returns the current value.
func (s *AtomicString) Get() string {
s.mu.Lock()
str := s.str
s.mu.Unlock()
return str
}
// CompareAndSwap atomatically swaps the old with the new value.
func (s *AtomicString) CompareAndSwap(oldval, newval string) (swqpped bool) {
s.mu.Lock()
defer s.mu.Unlock()
if s.str == oldval {
s.str = newval
return true
}
return false
}