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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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 /** @addtogroup sync
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/** @addtogroup sync
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 * @{
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 * @{
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 */
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 */
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/**
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/**
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 * @file
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 * @file
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 *
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 *
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 * A reader/writer lock can be held by multiple readers at a time.
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 * A reader/writer lock can be held by multiple readers at a time.
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 * Or it can be exclusively held by a sole writer at a time.
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 * Or it can be exclusively held by a sole writer at a time.
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 *
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 *
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 * These locks are not recursive.
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 * These locks are not recursive.
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 * Because technique called direct hand-off is used, neither readers
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 * Because a technique called direct hand-off is used and because
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 * waiting takes place in a single wait queue, neither readers
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 * nor writers will suffer starvation.
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 * nor writers will suffer starvation.
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 *
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 *
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 * If there is a writer followed by a reader waiting for the rwlock
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 * If there is a writer followed by a reader waiting for the rwlock
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 * and the writer times out, all leading readers are automatically woken up
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 * and the writer times out, all leading readers are automatically woken up
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 * and allowed in.
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 * and allowed in.
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void release_spinlock(void *arg)
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void release_spinlock(void *arg)
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{
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{
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    spinlock_unlock((spinlock_t *) arg);
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    spinlock_unlock((spinlock_t *) arg);
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}
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}
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 /** @}
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/** @}
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 */
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 */
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