altos: Rework packet receive for cc1120

[fw/altos] / src / kernel / ao_mutex.c

diff --git a/src/kernel/ao_mutex.c b/src/kernel/ao_mutex.c
index 952ff46214a69db9b3e293992ee4f2e602576f46..a36fe93940906efdefaa37e616e0fa762f9daa88 100644 (file)
--- a/src/kernel/ao_mutex.c
+++ b/src/kernel/ao_mutex.c
@@ -17,6 +17,29 @@
 
 #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
 {