diff options
Diffstat (limited to 'pjlib/src/pj/lock.c')
| -rw-r--r-- | pjlib/src/pj/lock.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/pjlib/src/pj/lock.c b/pjlib/src/pj/lock.c new file mode 100644 index 00000000..10b967a8 --- /dev/null +++ b/pjlib/src/pj/lock.c @@ -0,0 +1,190 @@ +/* $Header: /pjproject-0.3/pjlib/src/pj/lock.c 3 10/29/05 11:51a Bennylp $ */
+/*
+ * $Log: /pjproject-0.3/pjlib/src/pj/lock.c $
+ *
+ * 3 10/29/05 11:51a Bennylp
+ * Version 0.3-pre2.
+ *
+ * 2 10/14/05 12:26a Bennylp
+ * Finished error code framework, some fixes in ioqueue, etc. Pretty
+ * major.
+ *
+ * 1 10/05/05 6:35p Bennylp
+ * Created.
+ */
+#include <pj/lock.h>
+#include <pj/os.h>
+#include <pj/assert.h>
+#include <pj/pool.h>
+#include <pj/string.h>
+#include <pj/errno.h>
+
+
+typedef void LOCK_OBJ;
+
+/*
+ * Lock structure.
+ */
+struct pj_lock_t
+{
+ LOCK_OBJ *lock_object;
+
+ pj_status_t (*acquire) (LOCK_OBJ*);
+ pj_status_t (*tryacquire) (LOCK_OBJ*);
+ pj_status_t (*release) (LOCK_OBJ*);
+ pj_status_t (*destroy) (LOCK_OBJ*);
+};
+
+typedef pj_status_t (*FPTR)(LOCK_OBJ*);
+
+/******************************************************************************
+ * Implementation of lock object with mutex.
+ */
+static pj_lock_t mutex_lock_template =
+{
+ NULL,
+ (FPTR) &pj_mutex_lock,
+ (FPTR) &pj_mutex_trylock,
+ (FPTR) &pj_mutex_unlock,
+ (FPTR) &pj_mutex_destroy
+};
+
+static pj_status_t create_mutex_lock( pj_pool_t *pool,
+ const char *name,
+ int type,
+ pj_lock_t **lock )
+{
+ pj_lock_t *p_lock;
+ pj_status_t rc;
+
+ PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL);
+
+ p_lock = pj_pool_alloc(pool, sizeof(pj_lock_t));
+ if (!p_lock)
+ return PJ_ENOMEM;
+
+ pj_memcpy(p_lock, &mutex_lock_template, sizeof(pj_lock_t));
+ rc = pj_mutex_create(pool, name, type, (pj_mutex_t**)&p_lock->lock_object);
+ if (rc != PJ_SUCCESS)
+ return rc;
+
+ *lock = p_lock;
+ return PJ_SUCCESS;
+}
+
+
+PJ_DEF(pj_status_t) pj_lock_create_simple_mutex( pj_pool_t *pool,
+ const char *name,
+ pj_lock_t **lock )
+{
+ return create_mutex_lock(pool, name, PJ_MUTEX_SIMPLE, lock);
+}
+
+PJ_DEF(pj_status_t) pj_lock_create_recursive_mutex( pj_pool_t *pool,
+ const char *name,
+ pj_lock_t **lock )
+{
+ return create_mutex_lock(pool, name, PJ_MUTEX_RECURSE, lock);
+}
+
+
+/******************************************************************************
+ * Implementation of NULL lock object.
+ */
+static pj_status_t null_op(void *arg)
+{
+ PJ_UNUSED_ARG(arg);
+ return PJ_SUCCESS;
+}
+
+static pj_lock_t null_lock_template =
+{
+ NULL,
+ &null_op,
+ &null_op,
+ &null_op,
+ &null_op
+};
+
+PJ_DEF(pj_status_t) pj_lock_create_null_mutex( pj_pool_t *pool,
+ const char *name,
+ pj_lock_t **lock )
+{
+ PJ_UNUSED_ARG(name);
+ PJ_UNUSED_ARG(pool);
+
+ PJ_ASSERT_RETURN(lock, PJ_EINVAL);
+
+ *lock = &null_lock_template;
+ return PJ_SUCCESS;
+}
+
+
+/******************************************************************************
+ * Implementation of semaphore lock object.
+ */
+#if defined(PJ_HAS_SEMAPHORE) && PJ_HAS_SEMAPHORE != 0
+
+static pj_lock_t sem_lock_template =
+{
+ NULL,
+ (FPTR) &pj_sem_wait,
+ (FPTR) &pj_sem_trywait,
+ (FPTR) &pj_sem_post,
+ (FPTR) &pj_sem_destroy
+};
+
+PJ_DEF(pj_status_t) pj_lock_create_semaphore( pj_pool_t *pool,
+ const char *name,
+ unsigned initial,
+ unsigned max,
+ pj_lock_t **lock )
+{
+ pj_lock_t *p_lock;
+ pj_status_t rc;
+
+ PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL);
+
+ p_lock = pj_pool_alloc(pool, sizeof(pj_lock_t));
+ if (!p_lock)
+ return PJ_ENOMEM;
+
+ pj_memcpy(p_lock, &sem_lock_template, sizeof(pj_lock_t));
+ rc = pj_sem_create( pool, name, initial, max,
+ (pj_sem_t**)&p_lock->lock_object);
+ if (rc != PJ_SUCCESS)
+ return rc;
+
+ *lock = p_lock;
+
+ return PJ_SUCCESS;
+}
+
+
+#endif /* PJ_HAS_SEMAPHORE */
+
+
+PJ_DEF(pj_status_t) pj_lock_acquire( pj_lock_t *lock )
+{
+ PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL);
+ return (*lock->acquire)(lock->lock_object);
+}
+
+PJ_DEF(pj_status_t) pj_lock_tryacquire( pj_lock_t *lock )
+{
+ PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL);
+ return (*lock->tryacquire)(lock->lock_object);
+}
+
+PJ_DEF(pj_status_t) pj_lock_release( pj_lock_t *lock )
+{
+ PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL);
+ return (*lock->release)(lock->lock_object);
+}
+
+PJ_DEF(pj_status_t) pj_lock_destroy( pj_lock_t *lock )
+{
+ PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL);
+ return (*lock->destroy)(lock->lock_object);
+}
+
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