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From 594e3c1ab576daddeb86015efc8b1677020b1878 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Sat, 24 Oct 2015 20:39:30 +0000
Subject: [PATCH 1/6] cilkrts
---
libcilkrts/runtime/os-unix.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)
diff --git a/libcilkrts/runtime/os-unix.c b/libcilkrts/runtime/os-unix.c
index cb582dd..e43d7d5 100644
--- a/libcilkrts/runtime/os-unix.c
+++ b/libcilkrts/runtime/os-unix.c
@@ -51,6 +51,7 @@
#if defined __linux__
# include <sys/sysinfo.h>
# include <sys/syscall.h>
+# include <sched.h>
#elif defined __APPLE__
# include <sys/sysctl.h>
// Uses sysconf(_SC_NPROCESSORS_ONLN) in verbose output
@@ -400,28 +401,19 @@ COMMON_SYSDEP void __cilkrts_sleep(void)
COMMON_SYSDEP void __cilkrts_yield(void)
{
-#if __APPLE__ || __FreeBSD__ || __VXWORKS__
- // On MacOS, call sched_yield to yield quantum. I'm not sure why we
- // don't do this on Linux also.
- sched_yield();
-#elif defined(__DragonFly__)
- // On DragonFly BSD, call sched_yield to yield quantum.
- sched_yield();
-#elif defined(__MIC__)
+#if defined(__MIC__)
// On MIC, pthread_yield() really trashes things. Arch's measurements
// showed that calling _mm_delay_32() (or doing nothing) was a better
// option. Delaying 1024 clock cycles is a reasonable compromise between
// giving up the processor and latency starting up when work becomes
// available
_mm_delay_32(1024);
-#elif defined(__ANDROID__) || (defined(__sun__) && defined(__svr4__))
- // On Android and Solaris, call sched_yield to yield quantum. I'm not
- // sure why we don't do this on Linux also.
- sched_yield();
-#else
- // On Linux, call pthread_yield (which in turn will call sched_yield)
- // to yield quantum.
+#elif defined(__sun__) && !defined(__svr4__)
+ // On old SunOS call pthread_yield to yield a quantum.
pthread_yield();
+#else
+ // On other platforms call sched_yield to yield a quantum.
+ sched_yield();
#endif
}
--
2.8.1
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