X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fkernel%2Fao_mutex.c;h=ff73e3bc6998410e29bafbdcc459ba305e0fd7a3;hb=f282b802d2f5a0da56bb8245169c46a16b2eed71;hp=952ff46214a69db9b3e293992ee4f2e602576f46;hpb=24167015705ae831692b95735968b04a876f935e;p=fw%2Faltos

diff --git a/src/kernel/ao_mutex.c b/src/kernel/ao_mutex.c
index 952ff462..ff73e3bc 100644
--- a/src/kernel/ao_mutex.c
+++ b/src/kernel/ao_mutex.c
@@ -3,7 +3,8 @@
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -17,6 +18,29 @@
 
 #include "ao.h"
 
+#ifndef HAS_MUTEX_TRY
+#define HAS_MUTEX_TRY 1
+#endif
+
+#if HAS_MUTEX_TRY
+
+uint8_t
+ao_mutex_try(__xdata uint8_t *mutex, uint8_t task_id) __reentrant
+{
+	uint8_t	ret;
+	if (*mutex == task_id)
+		ao_panic(AO_PANIC_MUTEX);
+	ao_arch_critical(
+		if (*mutex)
+			ret = 0;
+		else {
+			*mutex = task_id;
+			ret = 1;
+		});
+	return ret;
+}
+#endif
+
 void
 ao_mutex_get(__xdata uint8_t *mutex) __reentrant
 {