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Nanosleep workaround for z/OS in sleep.cc (#1067) 

* z/OS does not support nanosleep, add workaround to use sleep() and usleep() instead

* change unsigned to int, and fix while loop
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Abhina Sree 2020-10-29 04:49:02 -04:00 committed by GitHub
parent dce3322a54
commit a9704c268d
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1
CONTRIBUTORS
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@ -22,6 +22,7 @@
#
# Please keep the list sorted.
Abhina Sreeskantharajan <abhina.sreeskantharajan@ibm.com>
Albert Pretorius <pretoalb@gmail.com>
Alex Steele <steelal123@gmail.com>
Andriy Berestovskyy <berestovskyy@gmail.com>

16
src/sleep.cc
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@ -24,6 +24,10 @@
#include <windows.h>
#endif
#ifdef BENCHMARK_OS_ZOS
#include <unistd.h>
#endif
namespace benchmark {
#ifdef BENCHMARK_OS_WINDOWS
// Window's Sleep takes milliseconds argument.
@ -33,11 +37,23 @@ void SleepForSeconds(double seconds) {
}
#else // BENCHMARK_OS_WINDOWS
void SleepForMicroseconds(int microseconds) {
#ifdef BENCHMARK_OS_ZOS
// z/OS does not support nanosleep. Instead call sleep() and then usleep() to
// sleep for the remaining microseconds because usleep() will fail if its
// argument is greater than 1000000.
div_t sleepTime = div(microseconds, kNumMicrosPerSecond);
int seconds = sleepTime.quot;
while (seconds != 0)
seconds = sleep(seconds);
while (usleep(sleepTime.rem) == -1 && errno == EINTR)
;
#else
struct timespec sleep_time;
sleep_time.tv_sec = microseconds / kNumMicrosPerSecond;
sleep_time.tv_nsec = (microseconds % kNumMicrosPerSecond) * kNumNanosPerMicro;
while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR)
; // Ignore signals and wait for the full interval to elapse.
#endif
}
void SleepForMilliseconds(int milliseconds) {