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Diffstat (limited to '')
| -rw-r--r-- | locks/beos/proc_mutex.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/locks/beos/proc_mutex.c b/locks/beos/proc_mutex.c new file mode 100644 index 0000000..35a5e8f --- /dev/null +++ b/locks/beos/proc_mutex.c @@ -0,0 +1,242 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/*Read/Write locking implementation based on the MultiLock code from + * Stephen Beaulieu <hippo@be.com> + */ + +#include "apr_arch_proc_mutex.h" +#include "apr_strings.h" +#include "apr_portable.h" + +static apr_status_t _proc_mutex_cleanup(void * data) +{ + apr_proc_mutex_t *lock = (apr_proc_mutex_t*)data; + if (lock->LockCount != 0) { + /* we're still locked... */ + while (atomic_add(&lock->LockCount , -1) > 1){ + /* OK we had more than one person waiting on the lock so + * the sem is also locked. Release it until we have no more + * locks left. + */ + release_sem (lock->Lock); + } + } + delete_sem(lock->Lock); + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_create(apr_proc_mutex_t **mutex, + const char *fname, + apr_lockmech_e mech, + apr_pool_t *pool) +{ + apr_proc_mutex_t *new; + apr_status_t stat = APR_SUCCESS; + + if (mech != APR_LOCK_DEFAULT && mech != APR_LOCK_DEFAULT_TIMED) { + return APR_ENOTIMPL; + } + + new = (apr_proc_mutex_t *)apr_pcalloc(pool, sizeof(apr_proc_mutex_t)); + if (new == NULL){ + return APR_ENOMEM; + } + + if ((stat = create_sem(0, "APR_Lock")) < B_NO_ERROR) { + _proc_mutex_cleanup(new); + return stat; + } + new->LockCount = 0; + new->Lock = stat; + new->pool = pool; + + apr_pool_cleanup_register(new->pool, (void *)new, _proc_mutex_cleanup, + apr_pool_cleanup_null); + + (*mutex) = new; + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex, + const char *fname, + apr_pool_t *pool) +{ + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_lock(apr_proc_mutex_t *mutex) +{ + int32 stat; + + if (atomic_add(&mutex->LockCount, 1) > 0) { + if ((stat = acquire_sem(mutex->Lock)) < B_NO_ERROR) { + atomic_add(&mutex->LockCount, -1); + return stat; + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex) +{ + int32 stat; + + if (atomic_add(&mutex->LockCount, 1) > 0) { + stat = acquire_sem_etc(mutex->Lock, 1, 0, 0); + if (stat < B_NO_ERROR) { + atomic_add(&mutex->LockCount, -1); + if (stat == B_WOULD_BLOCK) { + stat = APR_EBUSY; + } + return stat; + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_timedlock(apr_proc_mutex_t *mutex, + apr_interval_time_t timeout) +{ + int32 stat; + + if (atomic_add(&mutex->LockCount, 1) > 0) { + if (timeout <= 0) { + stat = B_TIMED_OUT; + } + else { + stat = acquire_sem_etc(mutex->Lock, 1, B_RELATIVE_TIMEOUT, + timeout); + } + if (stat < B_NO_ERROR) { + atomic_add(&mutex->LockCount, -1); + if (stat == B_TIMED_OUT) { + stat = APR_TIMEUP; + } + return stat; + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex) +{ + int32 stat; + + if (atomic_add(&mutex->LockCount, -1) > 1) { + if ((stat = release_sem(mutex->Lock)) < B_NO_ERROR) { + atomic_add(&mutex->LockCount, 1); + return stat; + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex) +{ + apr_status_t stat; + if ((stat = _proc_mutex_cleanup(mutex)) == APR_SUCCESS) { + apr_pool_cleanup_kill(mutex->pool, mutex, _proc_mutex_cleanup); + return APR_SUCCESS; + } + return stat; +} + +APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex) +{ + return _proc_mutex_cleanup(mutex); +} + + +APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex) +{ + return NULL; +} + +APR_DECLARE(apr_lockmech_e) apr_proc_mutex_mech(apr_proc_mutex_t *mutex) +{ + return APR_LOCK_DEFAULT; +} + +APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex) +{ + return "beossem"; +} + +APR_DECLARE(const char *) apr_proc_mutex_defname(void) +{ + return "beossem"; +} + +APR_PERMS_SET_ENOTIMPL(proc_mutex) + +APR_POOL_IMPLEMENT_ACCESSOR(proc_mutex) + +/* Implement OS-specific accessors defined in apr_portable.h */ + +APR_DECLARE(apr_status_t) apr_os_proc_mutex_get_ex(apr_os_proc_mutex_t *ospmutex, + apr_proc_mutex_t *pmutex, + apr_lockmech_e *mech) +{ + ospmutex->sem = pmutex->Lock; + ospmutex->ben = pmutex->LockCount; + if (mech) { + *mech = APR_LOCK_DEFAULT; + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_os_proc_mutex_get(apr_os_proc_mutex_t *ospmutex, + apr_proc_mutex_t *pmutex) +{ + return apr_os_proc_mutex_get_ex(ospmutex, pmutex, NULL); +} + +APR_DECLARE(apr_status_t) apr_os_proc_mutex_put_ex(apr_proc_mutex_t **pmutex, + apr_os_proc_mutex_t *ospmutex, + apr_lockmech_e mech, + int register_cleanup, + apr_pool_t *pool) +{ + if (pool == NULL) { + return APR_ENOPOOL; + } + if (mech != APR_LOCK_DEFAULT && mech != APR_LOCK_DEFAULT_TIMED) { + return APR_ENOTIMPL; + } + + if ((*pmutex) == NULL) { + (*pmutex) = (apr_proc_mutex_t *)apr_pcalloc(pool, sizeof(apr_proc_mutex_t)); + (*pmutex)->pool = pool; + } + (*pmutex)->Lock = ospmutex->sem; + (*pmutex)->LockCount = ospmutex->ben; + + if (register_cleanup) { + apr_pool_cleanup_register(pool, *pmutex, _proc_mutex_cleanup, + apr_pool_cleanup_null); + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_os_proc_mutex_put(apr_proc_mutex_t **pmutex, + apr_os_proc_mutex_t *ospmutex, + apr_pool_t *pool) +{ + return apr_os_proc_mutex_put_ex(pmutex, ospmutex, APR_LOCK_DEFAULT, + 0, pool); +} + |