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typedef struct {
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typedef struct {
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    semaphore_t sem;
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    semaphore_t sem;
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} mutex_t;
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} mutex_t;
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#define mutex_lock(mtx) \
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#define mutex_lock(mtx) \
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    _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
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    _mutex_lock_timeout((mtx), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
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#define mutex_trylock(mtx) \
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#define mutex_trylock(mtx) \
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    _mutex_lock_timeout((mtx),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)
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    _mutex_lock_timeout((mtx), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)
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#define mutex_lock_timeout(mtx,usec) \
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#define mutex_lock_timeout(mtx, usec) \
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    _mutex_lock_timeout((mtx),(usec),SYNCH_FLAGS_NON_BLOCKING)
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    _mutex_lock_timeout((mtx), (usec), SYNCH_FLAGS_NON_BLOCKING)
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#define mutex_lock_active(mtx) \
 - 
 
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    while (mutex_trylock((mtx)) != ESYNCH_OK_ATOMIC)
 - 
 
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extern void mutex_initialize(mutex_t *mtx);
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extern void mutex_initialize(mutex_t *mtx);
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extern int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags);
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extern int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags);
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extern void mutex_unlock(mutex_t *mtx);
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extern void mutex_unlock(mutex_t *mtx);
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