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Bug 1013004 - Fix support for sampling intervals > 1 second; r=BenWa

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This commit is contained in:
Jim Chen 2014-08-19 15:34:49 -04:00
parent 114fa16473
commit e1fe7ef39b
1 changed files with 16 additions and 9 deletions
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25
tools/profiler/platform-linux.cc
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@ -631,19 +631,26 @@ void TickSample::PopulateContext(void* aContext)
}
}
// WARNING: Works with values up to 1 second
void OS::SleepMicro(int microseconds)
{
if (MOZ_UNLIKELY(microseconds >= 1000000)) {
// Use usleep for larger intervals, because the nanosleep
// code below only supports intervals < 1 second.
MOZ_ALWAYS_TRUE(!::usleep(microseconds));
return;
}
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = microseconds * 1000UL;
while (true) {
// in the case of interrupt we keep waiting
// nanosleep puts the remaining to back into ts
if (!nanosleep(&ts, &ts) || errno != EINTR) {
return;
}
}
}
int rv = ::nanosleep(&ts, &ts);
while (rv != 0 && errno == EINTR) {
// Keep waiting in case of interrupt.
// nanosleep puts the remaining time back into ts.
rv = ::nanosleep(&ts, &ts);
}
MOZ_ASSERT(!rv, "nanosleep call failed");
}