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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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#include <synch/synch.h>
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#include <synch/semaphore.h>
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#include <synch/semaphore.h>
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#include <synch/waitq.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#include <synch/synch.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <arch.h>
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#include <arch.h>
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/** Initialize semaphore
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 *
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 * Initialize semaphore.
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 *
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 * @param s Semaphore.
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 * @param val Maximal number of threads allowed to enter critical section.
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 */
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void semaphore_initialize(semaphore_t *s, int val)
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void semaphore_initialize(semaphore_t *s, int val)
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{
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{
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    pri_t pri;
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    pri_t pri;
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    waitq_initialize(&s->wq);
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    waitq_initialize(&s->wq);
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    spinlock_unlock(&s->wq.lock);
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    spinlock_unlock(&s->wq.lock);
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    cpu_priority_restore(pri);
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    cpu_priority_restore(pri);
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}
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}
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/** Semaphore down
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 *
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 * Semaphore down.
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 * Conditional mode and mode with timeout can be requested.
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 *
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 * @param s Semaphore.
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 * @param usec Timeout in microseconds.
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 * @param trydown Switches between blocking and non-blocking mode.
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 *
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 * For exact description of possible combinations of
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 * 'usec' and 'trydown', see comment for waitq_sleep_timeout().
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 *
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 * @return See comment for waitq_sleep_timeout().
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 */
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int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown)
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int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown)
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{
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{
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    return waitq_sleep_timeout(&s->wq, usec, trydown);
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    return waitq_sleep_timeout(&s->wq, usec, trydown);
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}
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}
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/** Semaphore up
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 *
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 * Semaphore up.
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 *
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 * @param s Semaphore.
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 */
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void semaphore_up(semaphore_t *s)
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void semaphore_up(semaphore_t *s)
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{
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{
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    waitq_wakeup(&s->wq, WAKEUP_FIRST);
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    waitq_wakeup(&s->wq, WAKEUP_FIRST);
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}
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}