Thread Mutex Routines
[Apache Portability Runtime library]




typedef struct apr_thread_mutex_t apr_thread_mutex_t


apr_status_t apr_thread_mutex_create (apr_thread_mutex_t **mutex, unsigned int flags, apr_pool_t *pool)
apr_status_t apr_thread_mutex_lock (apr_thread_mutex_t *mutex)
apr_status_t apr_thread_mutex_trylock (apr_thread_mutex_t *mutex)
apr_status_t apr_thread_mutex_unlock (apr_thread_mutex_t *mutex)
apr_status_t apr_thread_mutex_destroy (apr_thread_mutex_t *mutex)
apr_pool_tapr_thread_mutex_pool_get (const apr_thread_mutex_t *thethread_mutex)

Define Documentation


platform-optimal lock behavior


enable nested (recursive) locks


disable nested locks

Typedef Documentation

Opaque thread-local mutex structure

Function Documentation

apr_status_t apr_thread_mutex_create ( apr_thread_mutex_t **  mutex,
unsigned int  flags,
apr_pool_t pool 

Create and initialize a mutex that can be used to synchronize threads.

mutex the memory address where the newly created mutex will be stored.
flags Or'ed value of:
           APR_THREAD_MUTEX_DEFAULT   platform-optimal lock behavior.
           APR_THREAD_MUTEX_NESTED    enable nested (recursive) locks.
           APR_THREAD_MUTEX_UNNESTED  disable nested locks (non-recursive).
pool the pool from which to allocate the mutex.
Be cautious in using APR_THREAD_MUTEX_DEFAULT. While this is the most optimial mutex based on a given platform's performance charateristics, it will behave as either a nested or an unnested lock.

apr_status_t apr_thread_mutex_destroy ( apr_thread_mutex_t mutex  ) 

Destroy the mutex and free the memory associated with the lock.

mutex the mutex to destroy.

apr_status_t apr_thread_mutex_lock ( apr_thread_mutex_t mutex  ) 

Acquire the lock for the given mutex. If the mutex is already locked, the current thread will be put to sleep until the lock becomes available.

mutex the mutex on which to acquire the lock.

apr_pool_t* apr_thread_mutex_pool_get ( const apr_thread_mutex_t thethread_mutex  ) 

Get the pool used by this thread_mutex.

apr_pool_t the pool

apr_status_t apr_thread_mutex_trylock ( apr_thread_mutex_t mutex  ) 

Attempt to acquire the lock for the given mutex. If the mutex has already been acquired, the call returns immediately with APR_EBUSY. Note: it is important that the APR_STATUS_IS_EBUSY(s) macro be used to determine if the return value was APR_EBUSY, for portability reasons.

mutex the mutex on which to attempt the lock acquiring.

apr_status_t apr_thread_mutex_unlock ( apr_thread_mutex_t mutex  ) 

Release the lock for the given mutex.

mutex the mutex from which to release the lock.

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