Fix build issue in Mac OS X due missing scheduler

advance/lib/config.hin

@@ -106,9 +106,21 @@
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #undef HAVE_NETINET_IN_H
 
+/* Define to 1 if you have the `sched_getscheduler' function. */
+#undef HAVE_SCHED_GETSCHEDULER
+
+/* Define to 1 if you have the `sched_get_priority_max' function. */
+#undef HAVE_SCHED_GET_PRIORITY_MAX
+
 /* Define to 1 if you have the <sched.h> header file. */
 #undef HAVE_SCHED_H
 
+/* Define to 1 if you have the `sched_setscheduler' function. */
+#undef HAVE_SCHED_SETSCHEDULER
+
+/* Define to 1 if you have the `sched_yield' function. */
+#undef HAVE_SCHED_YIELD
+
 /* Define to 1 if you have the <slang.h> header file. */
 #undef HAVE_SLANG_H
 

advance/linux/os.c

@@ -346,7 +346,7 @@ int os_inner_init(const char* title)
 #endif
 #endif
 
-#ifdef _POSIX_PRIORITY_SCHEDULING /* OSDEF Check for POSIX scheduling */
+#if HAVE_SCHED_GETSCHEDULER && HAVE_SCHED_SETSCHEDULER && HAVE_SCHED_GET_PRIORITY_MAX && defined(_POSIX_PRIORITY_SCHEDULING) /* OSDEF Check for POSIX scheduling */
 	log_std(("os: scheduling available\n"));
 #ifdef SCHED_FIFO
 	/* set the SCHED_FIFO scheduling policy with maximum priority */

advance/linux/target.c

@@ -135,7 +135,7 @@ void target_done(void)
 
 void target_yield(void)
 {
-#ifdef _POSIX_PRIORITY_SCHEDULING /* OSDEF Check for POSIX scheduling */
+#if HAVE_SCHED_YIELD && defined(_POSIX_PRIORITY_SCHEDULING) /* OSDEF Check for POSIX scheduling */
 	sched_yield();
 #endif
 }

configure.ac

@@ -339,7 +339,7 @@ if test $ac_system = unix ; then
 	AC_CHECK_FUNCS([strcasecmp strerror])
 	AC_CHECK_FUNCS([uname sysconf backtrace backtrace_symbols])
 	AC_CHECK_FUNCS([flockfile funlockfile fread_unlocked fwrite_unlocked fgetc_unlocked feof_unlocked fseeko ftello])
-	AC_CHECK_FUNCS([iopl mprotect])
+	AC_CHECK_FUNCS([iopl mprotect sched_getscheduler sched_setscheduler sched_get_priority_max sched_yield])
 	AC_MSG_CHECKING([for port in/out])
 	AC_TRY_LINK([
 			#include <sys/io.h>