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authorRuss Cox <rsc@golang.org>2014-09-08 00:08:51 -0400
committerRuss Cox <rsc@golang.org>2014-09-08 00:08:51 -0400
commit8528da672cc093d4dd06732819abc1f7b6b5a46e (patch)
tree334be80d4a4c85b77db6f6fdb67cbf0528cba5f5 /src/time/internal_test.go
parent73bcb69f272cbf34ddcc9daa56427a8683b5a95d (diff)
downloadgo-8528da672cc093d4dd06732819abc1f7b6b5a46e.tar.gz
build: move package sources from src/pkg to src
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
Diffstat (limited to 'src/time/internal_test.go')
-rw-r--r--src/time/internal_test.go59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/time/internal_test.go b/src/time/internal_test.go
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+++ b/src/time/internal_test.go
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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 time
+
+func init() {
+ // force US/Pacific for time zone tests
+ ForceUSPacificForTesting()
+}
+
+var Interrupt = interrupt
+var DaysIn = daysIn
+
+func empty(arg interface{}, seq uintptr) {}
+
+// Test that a runtimeTimer with a duration so large it overflows
+// does not cause other timers to hang.
+//
+// This test has to be in internal_test.go since it fiddles with
+// unexported data structures.
+func CheckRuntimeTimerOverflow() {
+ // We manually create a runtimeTimer to bypass the overflow
+ // detection logic in NewTimer: we're testing the underlying
+ // runtime.addtimer function.
+ r := &runtimeTimer{
+ when: runtimeNano() + (1<<63 - 1),
+ f: empty,
+ arg: nil,
+ }
+ startTimer(r)
+
+ // Start a goroutine that should send on t.C right away.
+ t := NewTimer(1)
+
+ defer func() {
+ // Subsequent tests won't work correctly if we don't stop the
+ // overflow timer and kick the timer proc back into service.
+ //
+ // The timer proc is now sleeping and can only be awoken by
+ // adding a timer to the *beginning* of the heap. We can't
+ // wake it up by calling NewTimer since other tests may have
+ // left timers running that should have expired before ours.
+ // Instead we zero the overflow timer duration and start it
+ // once more.
+ stopTimer(r)
+ t.Stop()
+ r.when = 0
+ startTimer(r)
+ }()
+
+ // If the test fails, we will hang here until the timeout in the testing package
+ // fires, which is 10 minutes. It would be nice to catch the problem sooner,
+ // but there is no reliable way to guarantee that timerproc schedules without
+ // doing something involving timerproc itself. Previous failed attempts have
+ // tried calling runtime.Gosched and runtime.GC, but neither is reliable.
+ // So we fall back to hope: We hope we don't hang here.
+ <-t.C
+}