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