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- /*
- Copyright 2019 The Vitess Authors.
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
- http://www.apache.org/licenses/LICENSE-2.0
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
- package sync
- import (
- "math"
- "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 automatically 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 automatically swaps the old with the new value.
- func (i *AtomicInt64) CompareAndSwap(oldval, newval int64) (swapped bool) {
- return atomic.CompareAndSwapInt64(&i.int64, oldval, newval)
- }
- // AtomicFloat64 is a wrapper with a simpler interface around atomic.(Add|Store|Load|CompareAndSwap)Flat64 functions.
- type AtomicFloat64 struct {
- uint64
- }
- // NewAtomicFloat64 initializes a new AtomicFloat64 with a given value.
- func NewAtomicFloat64(n float64) AtomicFloat64 {
- return AtomicFloat64{math.Float64bits(n)}
- }
- // Set atomically sets n as new value.
- func (f *AtomicFloat64) Set(n float64) {
- atomic.StoreUint64(&f.uint64, math.Float64bits(n))
- }
- // Get atomically returns the current value.
- func (f *AtomicFloat64) Get() float64 {
- return math.Float64frombits(atomic.LoadUint64(&f.uint64))
- }
- // CompareAndSwap automatically swaps the old with the new value.
- func (f *AtomicFloat64) CompareAndSwap(oldval, newval float64) (swapped bool) {
- return atomic.CompareAndSwapUint64(&f.uint64, math.Float64bits(oldval), math.Float64bits(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 automatically 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))
- }
- // AtomicBool gives an atomic boolean variable.
- type AtomicBool struct {
- int32
- }
- // NewAtomicBool initializes a new AtomicBool with a given value.
- func NewAtomicBool(n bool) AtomicBool {
- if n {
- return AtomicBool{1}
- }
- return AtomicBool{0}
- }
- // Set atomically sets n as new value.
- func (i *AtomicBool) Set(n bool) {
- if n {
- atomic.StoreInt32(&i.int32, 1)
- } else {
- atomic.StoreInt32(&i.int32, 0)
- }
- }
- // Get atomically returns the current value.
- func (i *AtomicBool) Get() bool {
- return atomic.LoadInt32(&i.int32) != 0
- }
- // CompareAndSwap automatically swaps the old with the new value.
- func (i *AtomicBool) CompareAndSwap(o, n bool) bool {
- var old, new int32
- if o {
- old = 1
- }
- if n {
- new = 1
- }
- return atomic.CompareAndSwapInt32(&i.int32, old, new)
- }
- // 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 automatically 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
- }
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