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Bug 874425 - Ensure that we never return an negative duration. r=froydnj

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David Rajchenbach-Teller 2013-08-26 10:33:49 -04:00
parent b55a962c1b
commit 992f997845
1 changed files with 5 additions and 0 deletions
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5
toolkit/components/osfile/modules/osfile_async_front.jsm
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@ -160,6 +160,11 @@ let Scheduler = {
if (!("durationMs" in data)) {
return data.ok;
}
// Bug 874425 demonstrates that two successive calls to Date.now()
// can actually produce an interval with negative duration.
// We assume that this is due to an operation that is so short
// that Date.now() is not monotonic, so we round this up to 0.
let durationMs = Math.max(0, data.durationMs);
// Accumulate (or initialize) outExecutionDuration
if (typeof options.outExecutionDuration == "number") {
options.outExecutionDuration += data.durationMs;