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[cm3/sync] mutex_lock now calls mutex_trylock repeatedly

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Oliver Meier 2014-12-05 17:51:09 +01:00 committed by Karl Palsson
parent a2fe6c49a8
commit f52a39cc48
1 changed files with 1 additions and 14 deletions
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15
lib/cm3/sync.c
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@ -45,20 +45,7 @@ uint32_t __strex(uint32_t val, volatile uint32_t *addr)
void mutex_lock(mutex_t *m)
{
uint32_t status = 0;
do {
/* Wait until the mutex is unlocked. */
while (__ldrex(m) != MUTEX_UNLOCKED);
/* Try to acquire it. */
status = __strex(MUTEX_LOCKED, m);
/* Did we get it? If not then try again. */
} while (status != 0);
/* Execute the mysterious Data Memory Barrier instruction! */
__dmb();
while (!mutex_trylock(m));
}
/* returns 1 if the lock was acquired */