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semaphore_example_test.go
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76 lines (57 loc) · 1.32 KB
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package async_test
import (
"fmt"
"sync"
"time"
"github.com/b97tsk/async"
)
func ExampleSemaphore() {
var wg sync.WaitGroup // For keeping track of goroutines.
var myExecutor async.Executor
myExecutor.Autorun(func() { wg.Go(myExecutor.Run) })
mySemaphore := async.NewSemaphore(12)
for n := async.Weight(1); n <= 8; n++ {
myExecutor.Spawn(mySemaphore.Acquire(n).Then(async.Do(func() {
fmt.Println(n)
wg.Go(func() {
time.Sleep(100 * time.Millisecond)
myExecutor.Spawn(async.Do(func() { mySemaphore.Release(n) }))
})
})))
}
wg.Wait()
// Output:
// 1
// 2
// 3
// 4
// 5
// 6
// 7
// 8
}
func ExampleSemaphore_cancel() {
var wg sync.WaitGroup // For keeping track of goroutines.
var myExecutor async.Executor
myExecutor.Autorun(func() { wg.Go(myExecutor.Run) })
mySemaphore := async.NewSemaphore(3)
myExecutor.Spawn(func(co *async.Coroutine) async.Result {
// Four Acquire calls, only two of them can succeed;
// the other two get canceled later when co ends.
for n := async.Weight(1); n <= 4; n++ {
co.Spawn(mySemaphore.Acquire(n).Then(async.Do(func() {
fmt.Println(n)
})))
}
var sig async.Signal
wg.Go(func() {
time.Sleep(100 * time.Millisecond)
myExecutor.Spawn(async.Do(sig.Notify))
})
return co.Await(&sig).End()
})
wg.Wait()
// Output:
// 1
// 2
}