diff options
Diffstat (limited to 'src/kernel/ao_mutex.c')
| -rw-r--r-- | src/kernel/ao_mutex.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/kernel/ao_mutex.c b/src/kernel/ao_mutex.c index 952ff462..a36fe939 100644 --- 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 { |