Add configure support for REPLACE_SCHED_YIELD

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in OpenLDAP: pkg/ldap/configure.in,v 1.610 2005/12/16 15:52:59 ando Exp .
+# From configure.in OpenLDAP: pkg/ldap/configure.in,v 1.612 2006/01/03 22:11:59 kurt Exp .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.59.
 #
@@ -24741,6 +24741,21 @@ echo "${ECHO_T}$ol_cv_pthread_create_works" >&6
 				{ { echo "$as_me:$LINENO: error: pthread_create is not usable, check environment settings" >&5
 echo "$as_me: error: pthread_create is not usable, check environment settings" >&2;}
    { (exit 1); exit 1; }; }
+			fi
+
+			ol_replace_sched_yeild=no
+			case "$target" in
+			*-*-linux*)
+				ol_replace_sched_yeild=yes
+			;;
+			esac
+
+			if test $ol_replace_sched_yeild = yes ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define REPLACE_SCHED_YEILD 1
+_ACEOF
+
 			fi
 
 						if test $ol_with_yielding_select = auto ; then

configure.in

@@ -1587,6 +1587,18 @@ dnl			[ol_cv_pthread_lpthread_lexc])
 				AC_MSG_ERROR([pthread_create is not usable, check environment settings])
 			fi
 
+			ol_replace_sched_yeild=no
+			case "$target" in
+			*-*-linux*) 
+				ol_replace_sched_yeild=yes
+			;;
+			esac
+
+			if test $ol_replace_sched_yeild = yes ; then
+				AC_DEFINE([REPLACE_SCHED_YEILD],1,
+					[define to replace sched_yeild(2)])
+			fi
+
 			dnl Check if select causes an yield
 			if test $ol_with_yielding_select = auto ; then
 				AC_CACHE_CHECK([if select yields when using pthreads],

include/portable.hin

@@ -915,6 +915,9 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
+/* define to replace sched_yeild(2) */
+#undef REPLACE_SCHED_YEILD
+
 /* Define as the return type of signal handlers (`int' or `void'). */
 #undef RETSIGTYPE