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Implement SleepNanoseconds() on Windows.

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This uses the naïve implementation originally written
https://codereview.chromium.org/807973002/#ps180001.

Bug: crashpad:192
Change-Id: Id00908dafb8886d6163a8b17213d3b7c33b81963
Reviewed-on: https://chromium-review.googlesource.com/606998
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Robert Sesek 2017-08-08 17:50:01 -04:00 committed by Commit Bot
parent 01110c0a3b
commit f16e4eb9ff
2 changed files with 10 additions and 6 deletions
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8
util/misc/clock.h
View File

@ -34,19 +34,15 @@ namespace crashpad {
//! \return The value of the system’s monotonic clock, in nanoseconds.
uint64_t ClockMonotonicNanoseconds();
#if !defined(OS_WIN) // Not implemented on Windows yet.
//! \brief Sleeps for the specified duration.
//!
//! \param[in] nanoseconds The number of nanoseconds to sleep. The actual sleep
//! may be slightly longer due to latencies and timer resolution.
//!
//! This function is resilient against the underlying `nanosleep()` system call
//! being interrupted by a signal.
//! On POSIX, this function is resilient against the underlying `nanosleep()`
//! system call being interrupted by a signal.
void SleepNanoseconds(uint64_t nanoseconds);
#endif
} // namespace crashpad
#endif // CRASHPAD_UTIL_MISC_CLOCK_H_

8
util/misc/clock_win.cc
View File

@ -45,4 +45,12 @@ uint64_t ClockMonotonicNanoseconds() {
((leftover_ticks * kNanosecondsPerSecond) / frequency);
}
void SleepNanoseconds(uint64_t nanoseconds) {
// This is both inaccurate (will be way too long for short sleeps) and
// incorrect (can sleep for less than requested). But it's what's available
// without implementing a busy loop.
constexpr uint64_t kNanosecondsPerMillisecond = static_cast<uint64_t>(1E6);
Sleep(static_cast<DWORD>(nanoseconds / kNanosecondsPerMillisecond));
}
} // namespace crashpad