os0thread.c Change pthread_yield to sched_yield

univ.i  	Change pthread_yield to sched_yield
configure.in	Change pthread_yield to sched_yield

BitKeeper/etc/logging_ok

@@ -2,3 +2,4 @@ sasha@mysql.sashanet.com
 monty@donna.mysql.fi
 serg@serg.mysql.com
 jcole@abel.spaceapes.com
+heikki@donna.mysql.fi

innobase/configure.in

@@ -7,8 +7,9 @@ AM_INIT_AUTOMAKE(ib, 0.90)
 AC_PROG_CC
 AC_PROG_RANLIB
 AC_PROG_INSTALL
-AC_CHECK_HEADERS(aio.h)
+AC_CHECK_HEADERS(aio.h sched.h)
 AC_CHECK_SIZEOF(int, 4)
+AC_CHECK_FUNCS(sched_yield)
 AC_C_INLINE
 AC_C_BIGENDIAN
 

innobase/include/univ.i

@@ -39,6 +39,10 @@ subdirectory of 'mysql'. */
 /* Include the header file generated by GNU autoconf */
 #include "../ib_config.h"
 
+#ifdef HAVE_SCHED_H
+#include <sched.h>
+#endif
+
 #ifdef HAVE_PREAD
 #define HAVE_PWRITE
 #endif

innobase/os/os0thread.c

@@ -137,8 +137,8 @@ os_thread_yield(void)
 {
 #if defined(__WIN__)
 	Sleep(0);
-#elif defined(HAVE_PTHREAD_YIELD)
-	pthread_yield();
+#elif (defined(HAVE_SCHED_YIELD) && defined(HAVE_SCHED_H))
+	sched_yield();
 #else
         os_thread_sleep(0);
 #endif