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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cgotest
/*
// mysleep returns the absolute start time in ms.
long long mysleep(int seconds);
// twoSleep returns the absolute start time of the first sleep
// in ms.
long long twoSleep(int);
*/
import "C"
import (
"testing"
"time"
)
var sleepDone = make(chan int64)
// parallelSleep returns the absolute difference between the start time
// of the two sleeps.
func parallelSleep(n int) int64 {
t := int64(C.twoSleep(C.int(n))) - <-sleepDone
if t < 0 {
return -t
}
return t
}
//export BackgroundSleep
func BackgroundSleep(n int32) {
go func() {
sleepDone <- int64(C.mysleep(C.int(n)))
}()
}
func testParallelSleep(t *testing.T) {
sleepSec := 1
dt := time.Duration(parallelSleep(sleepSec)) * time.Millisecond
t.Logf("difference in start time for two sleep(%d) is %v", sleepSec, dt)
// bug used to run sleeps in serial, producing a 2*sleepSec-second delay.
// we detect if the start times of those sleeps are > 0.5*sleepSec-second.
if dt >= time.Duration(sleepSec)*time.Second/2 {
t.Fatalf("parallel %d-second sleeps slept for %f seconds", sleepSec, dt.Seconds())
}
}
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