From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Mon, 19 Oct 1998 09:15:53 +0000 (+0000)
Subject: YIELD more robustly.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=e7a4f449b8d928b435cf6dc0ee7260fd628fd9e0;p=p5sagit%2Fp5-mst-13.2.git

YIELD more robustly.

p4raw-id: //depot/cfgperl@2020
---

diff --git a/thread.h b/thread.h
index f883ced..dafaa1e 100644
--- a/thread.h
+++ b/thread.h
@@ -25,7 +25,19 @@
 #endif
 
 #ifndef YIELD
-#  define YIELD SCHED_YIELD
+#  ifdef SCHED_YIELD
+#    define YIELD SCHED_YIELD
+#  else
+#    ifdef HAS_SCHED_YIELD
+#      define YIELD sched_yield()
+#    else
+#      ifdef HAS_PTHREAD_YIELD
+    /* pthread_yield(NULL) platforms are expected
+     * to have #defined YIELD for themselves. */
+#        define YIELD pthread_yield()
+#      endif
+#    endif
+#  endif
 #endif
 
 #ifdef PTHREAD_CREATE_JOINABLE