This commit is contained in:
Mike Schwörer 2022-11-30 23:34:16 +01:00
parent 496c4e4f59
commit bdf5b53c20
Signed by: Mikescher
GPG Key ID: D3C7172E0A70F8CF
3 changed files with 210 additions and 4 deletions

View File

@ -1,16 +1,21 @@
package dataext package dataext
import "sync/atomic" import (
"context"
"sync/atomic"
"time"
)
type AtomicBool struct { type AtomicBool struct {
v int32 v int32
waiter chan bool // unbuffered
} }
func NewAtomicBool(value bool) *AtomicBool { func NewAtomicBool(value bool) *AtomicBool {
if value { if value {
return &AtomicBool{v: 0} return &AtomicBool{v: 0, waiter: make(chan bool)}
} else { } else {
return &AtomicBool{v: 1} return &AtomicBool{v: 1, waiter: make(chan bool)}
} }
} }
@ -24,4 +29,70 @@ func (a *AtomicBool) Set(value bool) {
} else { } else {
atomic.StoreInt32(&a.v, 0) atomic.StoreInt32(&a.v, 0)
} }
select {
case a.waiter <- value:
// message sent
default:
// no receiver on channel
}
}
func (a *AtomicBool) Wait(waitFor bool) {
if a.Get() == waitFor {
return
}
for {
if v, ok := ReadChannelWithTimeout(a.waiter, 128*time.Millisecond); ok {
if v == waitFor {
return
}
} else {
if a.Get() == waitFor {
return
}
}
}
}
func (a *AtomicBool) WaitWithContext(ctx context.Context, waitFor bool) error {
if err := ctx.Err(); err != nil {
return err
}
if a.Get() == waitFor {
return nil
}
for {
if err := ctx.Err(); err != nil {
return err
}
timeOut := 128 * time.Millisecond
if dl, ok := ctx.Deadline(); ok {
timeOutMax := dl.Sub(time.Now())
if timeOutMax <= 0 {
timeOut = 0
} else if 0 < timeOutMax && timeOutMax < timeOut {
timeOut = timeOutMax
}
}
if v, ok := ReadChannelWithTimeout(a.waiter, timeOut); ok {
if v == waitFor {
return nil
}
} else {
if err := ctx.Err(); err != nil {
return err
}
if a.Get() == waitFor {
return nil
}
}
}
} }

14
syncext/channel.go Normal file
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@ -0,0 +1,14 @@
package dataext
import "time"
func ReadChannelWithTimeout[T any](c chan T, timeout time.Duration) (T, bool) {
afterCh := time.After(timeout)
select {
case rv := <-c:
return rv, true
case <-afterCh:
return *new(T), false
}
}

121
syncext/channel_test.go Normal file
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@ -0,0 +1,121 @@
package dataext
import (
"testing"
"time"
)
func TestTimeoutReadBuffered(t *testing.T) {
c := make(chan int, 1)
go func() {
time.Sleep(200 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if ok {
t.Error("Read success, but should timeout")
}
}
func TestTimeoutReadBigBuffered(t *testing.T) {
c := make(chan int, 128)
go func() {
time.Sleep(200 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if ok {
t.Error("Read success, but should timeout")
}
}
func TestTimeoutReadUnbuffered(t *testing.T) {
c := make(chan int)
go func() {
time.Sleep(200 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if ok {
t.Error("Read success, but should timeout")
}
}
func TestNoTimeoutAfterStartReadBuffered(t *testing.T) {
c := make(chan int, 1)
go func() {
time.Sleep(10 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if !ok {
t.Error("Read timeout, but should have succeeded")
}
}
func TestNoTimeoutAfterStartReadBigBuffered(t *testing.T) {
c := make(chan int, 128)
go func() {
time.Sleep(10 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if !ok {
t.Error("Read timeout, but should have succeeded")
}
}
func TestNoTimeoutAfterStartReadUnbuffered(t *testing.T) {
c := make(chan int)
go func() {
time.Sleep(10 * time.Millisecond)
c <- 112
}()
_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
if !ok {
t.Error("Read timeout, but should have succeeded")
}
}
func TestNoTimeoutBeforeStartReadBuffered(t *testing.T) {
c := make(chan int, 1)
c <- 112
_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
if !ok {
t.Error("Read timeout, but should have succeeded")
}
}
func TestNoTimeoutBeforeStartReadBigBuffered(t *testing.T) {
c := make(chan int, 128)
c <- 112
_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
if !ok {
t.Error("Read timeout, but should have succeeded")
}
}