diff options
| -rw-r--r-- | core/cortex-m/task.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/core/cortex-m/task.c b/core/cortex-m/task.c index aed0a6b13c..4e4928929e 100644 --- a/core/cortex-m/task.c +++ b/core/cortex-m/task.c @@ -339,8 +339,11 @@ void mutex_lock(struct mutex *mtx) " it eq\n" " strexeq %0, %2, [%1]\n" : "=&r" (value) - : "r" (&mtx->lock), "r" (1) : "cc"); - if (value) { + : "r" (&mtx->lock), "r" (2) : "cc"); + /* "value" is equals to 1 if the store conditional failed, + * 2 if somebody else owns the mutex, 0 else. + */ + if (value == 2) { /* contention on the mutex */ task_wait_msg(0); } |