105 lines
1.7 KiB
Go
105 lines
1.7 KiB
Go
package syncext
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import (
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"context"
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"sync/atomic"
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"time"
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)
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type AtomicBool struct {
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v int32
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waiter chan bool // unbuffered
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}
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func NewAtomicBool(value bool) *AtomicBool {
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if value {
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return &AtomicBool{v: 1, waiter: make(chan bool)}
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} else {
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return &AtomicBool{v: 0, waiter: make(chan bool)}
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}
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}
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func (a *AtomicBool) Get() bool {
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return atomic.LoadInt32(&a.v) == 1
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}
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func (a *AtomicBool) Set(value bool) {
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if value {
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atomic.StoreInt32(&a.v, 1)
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} else {
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atomic.StoreInt32(&a.v, 0)
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}
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select {
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case a.waiter <- value:
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// message sent
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default:
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// no receiver on channel
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}
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}
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func (a *AtomicBool) Wait(waitFor bool) {
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if a.Get() == waitFor {
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return
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}
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for {
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if v, ok := ReadChannelWithTimeout(a.waiter, 128*time.Millisecond); ok {
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if v == waitFor {
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return
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}
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} else {
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if a.Get() == waitFor {
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return
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}
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}
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}
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}
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func (a *AtomicBool) WaitWithTimeout(timeout time.Duration, waitFor bool) error {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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return a.WaitWithContext(ctx, waitFor)
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}
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func (a *AtomicBool) WaitWithContext(ctx context.Context, waitFor bool) error {
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if err := ctx.Err(); err != nil {
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return err
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}
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if a.Get() == waitFor {
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return nil
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}
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for {
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if err := ctx.Err(); err != nil {
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return err
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}
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timeOut := 128 * time.Millisecond
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if dl, ok := ctx.Deadline(); ok {
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timeOutMax := dl.Sub(time.Now())
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if timeOutMax <= 0 {
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timeOut = 0
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} else if 0 < timeOutMax && timeOutMax < timeOut {
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timeOut = timeOutMax
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}
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}
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if v, ok := ReadChannelWithTimeout(a.waiter, timeOut); ok {
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if v == waitFor {
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return nil
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}
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} else {
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if err := ctx.Err(); err != nil {
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return err
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}
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if a.Get() == waitFor {
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return nil
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}
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}
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}
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}
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