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deadprogram
944176beef
Ticker.Stop does not drain already-buffered ticks from the channel, so on slow CI runners a tick may already be queued before Stop takes effect, causing a spurious "fail: ticker should have stopped!" failure. Drain the channel immediately after Stop before checking that no new ticks arrive. Signed-off-by: deadprogram <ron@hybridgroup.com>
62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
package main
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import "time"
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var timer = time.NewTimer(time.Millisecond)
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func main() {
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// Test ticker.
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ticker := time.NewTicker(time.Millisecond * 500)
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println("waiting on ticker")
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go func() {
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time.Sleep(time.Millisecond * 150)
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println(" - after 150ms")
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time.Sleep(time.Millisecond * 200)
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println(" - after 200ms")
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time.Sleep(time.Millisecond * 300)
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println(" - after 300ms")
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}()
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<-ticker.C
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println("waited on ticker at 500ms")
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<-ticker.C
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println("waited on ticker at 1000ms")
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ticker.Stop()
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// Drain any tick that was already queued before Stop took effect.
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select {
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case <-ticker.C:
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default:
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}
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time.Sleep(time.Millisecond * 750)
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select {
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case <-ticker.C:
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println("fail: ticker should have stopped!")
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default:
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println("ticker was stopped (didn't send anything after 750ms)")
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}
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timer := time.NewTimer(time.Millisecond * 750)
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println("waiting on timer")
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go func() {
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time.Sleep(time.Millisecond * 200)
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println(" - after 200ms")
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time.Sleep(time.Millisecond * 400)
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println(" - after 400ms")
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}()
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<-timer.C
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println("waited on timer at 750ms")
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time.Sleep(time.Millisecond * 500)
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reset := timer.Reset(time.Millisecond * 750)
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println("timer reset:", reset)
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println("waiting on timer")
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go func() {
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time.Sleep(time.Millisecond * 200)
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println(" - after 200ms")
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time.Sleep(time.Millisecond * 400)
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println(" - after 400ms")
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}()
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<-timer.C
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println("waited on timer at 750ms")
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time.Sleep(time.Millisecond * 500)
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}
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