48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
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diff --git a/libcilkrts/runtime/os-unix.c b/libcilkrts/runtime/os-unix.c
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index cb582dd..e43d7d5 100644
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--- a/libcilkrts/runtime/os-unix.c
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+++ b/libcilkrts/runtime/os-unix.c
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@@ -51,6 +51,7 @@
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#if defined __linux__
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# include <sys/sysinfo.h>
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# include <sys/syscall.h>
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+# include <sched.h>
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#elif defined __APPLE__
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# include <sys/sysctl.h>
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// Uses sysconf(_SC_NPROCESSORS_ONLN) in verbose output
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@@ -400,28 +401,19 @@ COMMON_SYSDEP void __cilkrts_sleep(void)
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COMMON_SYSDEP void __cilkrts_yield(void)
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{
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-#if __APPLE__ || __FreeBSD__ || __VXWORKS__
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- // On MacOS, call sched_yield to yield quantum. I'm not sure why we
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- // don't do this on Linux also.
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- sched_yield();
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-#elif defined(__DragonFly__)
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- // On DragonFly BSD, call sched_yield to yield quantum.
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- sched_yield();
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-#elif defined(__MIC__)
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+#if defined(__MIC__)
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// On MIC, pthread_yield() really trashes things. Arch's measurements
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// showed that calling _mm_delay_32() (or doing nothing) was a better
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// option. Delaying 1024 clock cycles is a reasonable compromise between
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// giving up the processor and latency starting up when work becomes
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// available
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_mm_delay_32(1024);
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-#elif defined(__ANDROID__) || (defined(__sun__) && defined(__svr4__))
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- // On Android and Solaris, call sched_yield to yield quantum. I'm not
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- // sure why we don't do this on Linux also.
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- sched_yield();
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-#else
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- // On Linux, call pthread_yield (which in turn will call sched_yield)
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- // to yield quantum.
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+#elif defined(__sun__) && !defined(__svr4__)
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+ // On old SunOS call pthread_yield to yield a quantum.
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pthread_yield();
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+#else
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+ // On other platforms call sched_yield to yield a quantum.
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+ sched_yield();
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#endif
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}
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