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Diffstat (limited to 'pjlib/src/pj/lock.c')
| -rw-r--r-- | pjlib/src/pj/lock.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/pjlib/src/pj/lock.c b/pjlib/src/pj/lock.c new file mode 100644 index 0000000..a7879af --- /dev/null +++ b/pjlib/src/pj/lock.c @@ -0,0 +1,198 @@ +/* $Id: lock.c 3553 2011-05-05 06:14:19Z nanang $ */ +/* + * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) + * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#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_mutex_t *mutex; + pj_status_t rc; + + PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL); + + p_lock = PJ_POOL_ALLOC_T(pool, 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, &mutex); + if (rc != PJ_SUCCESS) + return rc; + + p_lock->lock_object = mutex; + *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_sem_t *sem; + pj_status_t rc; + + PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL); + + p_lock = PJ_POOL_ALLOC_T(pool, 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, &sem); + if (rc != PJ_SUCCESS) + return rc; + + p_lock->lock_object = sem; + *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); +} + |