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Bug 1004923 part 4 - Add some early returns to PRMJ_Now. r=njn

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This commit is contained in:
Jan de Mooij 2014-05-03 11:08:26 +02:00
parent 791992b539
commit e842442d30
1 changed files with 13 additions and 15 deletions
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28
js/src/prmjtime.cpp
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@ -351,24 +351,22 @@ PRMJ_Now()
// behavior for this call. It's possible that in the
// future, the user will want the high resolution timer, so
// we don't disable it entirely.
returnedTime = int64_t(lowresTime);
needsCalibration = false;
} else {
// It is possible that when we recalibrate, we will return a
// value less than what we have returned before; this is
// unavoidable. We cannot tell the different between a
// faulty QueryPerformanceCounter implementation and user
// changes to the operating system time. Since we must
// respect user changes to the operating system time, we
// cannot maintain the invariant that Date.now() never
// decreases; the old implementation has this behavior as
// well.
needsCalibration = true;
return int64_t(lowresTime);
}
// It is possible that when we recalibrate, we will return a
// value less than what we have returned before; this is
// unavoidable. We cannot tell the different between a
// faulty QueryPerformanceCounter implementation and user
// changes to the operating system time. Since we must
// respect user changes to the operating system time, we
// cannot maintain the invariant that Date.now() never
// decreases; the old implementation has this behavior as
// well.
needsCalibration = true;
} else {
// No detectable clock skew.
returnedTime = int64_t(highresTime);
needsCalibration = false;
return int64_t(highresTime);
}
} else {
// No high resolution timer is available, so fall back.