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Handle partial nanosleeps in this_thread::sleep_for
Signals may result in nanosleep returning with only some of the requested sleeping performed. Utilize nanosleep's "time-remaining" out parameter to continue sleeping when this occurs. llvm-svn: 210210
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@ -121,7 +121,9 @@ sleep_for(const chrono::nanoseconds& ns)
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ts.tv_sec = ts_sec_max;
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ts.tv_nsec = giga::num - 1;
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}
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nanosleep(&ts, 0);
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while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
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;
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}
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}
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@ -15,9 +15,29 @@
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#include <thread>
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#include <cstdlib>
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#include <cassert>
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#include <signal.h>
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#include <sys/time.h>
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int main()
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{
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int ec;
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struct sigaction action;
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action.sa_handler = [](int) {};
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0;
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ec = sigaction(SIGALRM, &action, nullptr);
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assert(!ec);
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struct itimerval it;
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it.it_interval = { 0 };
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it.it_value.tv_sec = 0;
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it.it_value.tv_usec = 250000;
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// This will result in a SIGALRM getting fired resulting in the nanosleep
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// inside sleep_for getting EINTR.
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ec = setitimer(ITIMER_REAL, &it, nullptr);
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assert(!ec);
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typedef std::chrono::system_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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