//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
-// ALLOW_RETRIES: 2
// <thread>
int main(int, char**)
{
- typedef std::chrono::system_clock Clock;
- typedef Clock::time_point time_point;
- std::chrono::milliseconds ms(500);
- time_point t0 = Clock::now();
- std::this_thread::sleep_until(t0 + ms);
- time_point t1 = Clock::now();
- std::chrono::nanoseconds ns = (t1 - t0) - ms;
- std::chrono::nanoseconds err = 5 * ms / 100;
- // The time slept is within 5% of 500ms
- assert(std::abs(ns.count()) < err.count());
+ typedef std::chrono::system_clock Clock;
+ typedef Clock::time_point time_point;
+ std::chrono::milliseconds ms(500);
+ time_point t0 = Clock::now();
+ std::this_thread::sleep_until(t0 + ms);
+ time_point t1 = Clock::now();
+ // NOTE: Operating systems are (by default) best effort and therefore we may
+ // have slept longer, perhaps much longer than we requested.
+ assert(t1 - t0 >= ms);
return 0;
}