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 */
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 */
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#include <synch/mutex.h>
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#include <synch/mutex.h>
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#include <synch/semaphore.h>
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#include <synch/semaphore.h>
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#include <synch/synch.h>
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#include <synch/synch.h>
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#include <debug.h>
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/** Initialize mutex
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/** Initialize mutex.
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 *
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 *
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 * Initialize mutex.
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 * @param mtx       Mutex.
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 *
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 * @param mtx Mutex.
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 * @param type      Type of the mutex.
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 */
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 */
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void mutex_initialize(mutex_t *mtx)
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void mutex_initialize(mutex_t *mtx, mutex_type_t type)
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{
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{
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    mtx->type = type;
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    semaphore_initialize(&mtx->sem, 1);
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    semaphore_initialize(&mtx->sem, 1);
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}
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}
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/** Acquire mutex
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/** Acquire mutex.
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 *
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 *
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 * Acquire mutex.
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 * Timeout mode and non-blocking mode can be requested.
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 * Timeout mode and non-blocking mode can be requested.
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 *
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 *
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 * @param mtx Mutex.
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 * @param mtx       Mutex.
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 * @param usec Timeout in microseconds.
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 * @param usec      Timeout in microseconds.
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 * @param flags Specify mode of operation.
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 * @param flags     Specify mode of operation.
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 *
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 *
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 * For exact description of possible combinations of
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 * For exact description of possible combinations of
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 * usec and flags, see comment for waitq_sleep_timeout().
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 * usec and flags, see comment for waitq_sleep_timeout().
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 *
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 *
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 * @return See comment for waitq_sleep_timeout().
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 * @return      See comment for waitq_sleep_timeout().
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 */
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 */
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int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags)
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int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags)
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{
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{
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    int rc;
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    if (mtx->type == MUTEX_PASSIVE) {
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    return _semaphore_down_timeout(&mtx->sem, usec, flags);
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        rc = _semaphore_down_timeout(&mtx->sem, usec, flags);
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    } else {
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        ASSERT(mtx->type == MUTEX_ACTIVE);
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        ASSERT(usec == SYNCH_NO_TIMEOUT);
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        ASSERT(!(flags & SYNCH_FLAGS_INTERRUPTIBLE));
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        do {
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            rc = semaphore_trydown(&mtx->sem);
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        } while (SYNCH_FAILED(rc) &&
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            !(flags & SYNCH_FLAGS_NON_BLOCKING));
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    }
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    return rc;
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}
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}
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/** Release mutex
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/** Release mutex.
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 *
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 * Release mutex.
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 *
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 *
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 * @param mtx Mutex.
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 * @param mtx       Mutex.
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 */
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 */
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void mutex_unlock(mutex_t *mtx)
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void mutex_unlock(mutex_t *mtx)
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{
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{
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    semaphore_up(&mtx->sem);
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    semaphore_up(&mtx->sem);
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}
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}