Kernel.sleep() is not monotonic when system clock changes during sleeping
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Key: JRUBY-6236
URL: https://jira.codehaus.org/browse/JRUBY-6236
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Environment: CentOS 5.6
Reporter: Yamada Goro
Changing system clock to past time during sleeping results in additional sleep
time.
For example, call sleep(10), set system clock 10 seconds ago, then sleep()
takes 20 seconds.
This seems to be caused by the code below. It uses System.currentTimeMillis()
to determine how long to sleep.
{code:title=RubyKernel.sleep()|borderStyle=solid}
// Spurious wakeup-loop
do {
long loopStartTime = System.currentTimeMillis();
try {
// We break if we know this sleep was explicitly woken up/interrupted
if (!rubyThread.sleep(milliseconds)) break;
} catch (InterruptedException iExcptn) {
}
milliseconds -= (System.currentTimeMillis() - loopStartTime);
} while (milliseconds > 0);
{code}
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