mirror of git://gcc.gnu.org/git/gcc.git
60 lines
1.9 KiB
Go
60 lines
1.9 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 time
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func init() {
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// force US/Pacific for time zone tests
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ForceUSPacificForTesting()
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}
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var Interrupt = interrupt
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var DaysIn = daysIn
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func empty(arg interface{}, seq uintptr) {}
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// Test that a runtimeTimer with a duration so large it overflows
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// does not cause other timers to hang.
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//
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// This test has to be in internal_test.go since it fiddles with
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// unexported data structures.
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func CheckRuntimeTimerOverflow() {
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// We manually create a runtimeTimer to bypass the overflow
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// detection logic in NewTimer: we're testing the underlying
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// runtime.addtimer function.
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r := &runtimeTimer{
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when: runtimeNano() + (1<<63 - 1),
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f: empty,
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arg: nil,
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}
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startTimer(r)
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// Start a goroutine that should send on t.C right away.
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t := NewTimer(1)
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defer func() {
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// Subsequent tests won't work correctly if we don't stop the
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// overflow timer and kick the timer proc back into service.
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//
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// The timer proc is now sleeping and can only be awoken by
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// adding a timer to the *beginning* of the heap. We can't
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// wake it up by calling NewTimer since other tests may have
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// left timers running that should have expired before ours.
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// Instead we zero the overflow timer duration and start it
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// once more.
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stopTimer(r)
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t.Stop()
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r.when = 0
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startTimer(r)
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}()
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// If the test fails, we will hang here until the timeout in the testing package
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// fires, which is 10 minutes. It would be nice to catch the problem sooner,
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// but there is no reliable way to guarantee that timerproc schedules without
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// doing something involving timerproc itself. Previous failed attempts have
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// tried calling runtime.Gosched and runtime.GC, but neither is reliable.
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// So we fall back to hope: We hope we don't hang here.
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<-t.C
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}
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