locks.c

Apache V2.0.15 Alpha For Linuxhttpd-2_0_15-alpha.tar.Z

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 *
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 */

#include "locks.h"
#include "apr_strings.h"
#include "apr_portable.h"

apr_status_t apr_lock_create(apr_lock_t **lock, apr_locktype_e type, 
                           apr_lockscope_e scope, const char *fname, 
                           apr_pool_t *cont)
{
    apr_lock_t *new;
    apr_status_t stat;

    new = (apr_lock_t *)apr_pcalloc(cont, sizeof(apr_lock_t));

    new->cntxt = cont;
    new->type  = type;
    new->scope = scope;
#if (APR_USE_FCNTL_SERIALIZE) || (APR_USE_FLOCK_SERIALIZE)
    /* file-based serialization primitives */
    if (scope != APR_INTRAPROCESS) {
        if (fname != NULL) {
            new->fname = apr_pstrdup(cont, fname);
        }
    }
#endif

#if APR_PROCESS_LOCK_IS_GLOBAL /* don't need intra lock for APR_LOCKALL */
    if (scope == APR_INTRAPROCESS) {
#else
    if (scope != APR_CROSS_PROCESS) {
#endif
#if APR_HAS_THREADS
        if ((stat = apr_unix_create_intra_lock(new)) != APR_SUCCESS) {
            return stat;
        }
#else
        if (scope != APR_LOCKALL) {
            return APR_ENOTIMPL;
        }
#endif
    }
    if (scope != APR_INTRAPROCESS) {
        if ((stat = apr_unix_create_inter_lock(new)) != APR_SUCCESS) {
            return stat;
        }
    }
    *lock = new;
    return APR_SUCCESS;
}

apr_status_t apr_lock_acquire(apr_lock_t *lock)
{
    apr_status_t stat;
#if APR_PROCESS_LOCK_IS_GLOBAL /* don't need intra lock for APR_LOCKALL */
    if (lock->scope == APR_INTRAPROCESS) {
#else
    if (lock->scope != APR_CROSS_PROCESS) {
#endif
#if APR_HAS_THREADS
        if ((stat = apr_unix_lock_intra(lock)) != APR_SUCCESS) {
            return stat;
        }
#else
        /* must be APR_LOCKALL */
#endif
    }
    if (lock->scope != APR_INTRAPROCESS) {
        if ((stat = apr_unix_lock_inter(lock)) != APR_SUCCESS) {
            return stat;
        }
    }
    return APR_SUCCESS;
}

apr_status_t apr_lock_release(apr_lock_t *lock)
{
    apr_status_t stat;

#if APR_PROCESS_LOCK_IS_GLOBAL /* don't need intra lock for APR_LOCKALL */
    if (lock->scope == APR_INTRAPROCESS) {
#else
    if (lock->scope != APR_CROSS_PROCESS) {
#endif
#if APR_HAS_THREADS
        if ((stat = apr_unix_unlock_intra(lock)) != APR_SUCCESS) {
            return stat;
        }
#else
        /* must be APR_LOCKALL */
#endif
    }
    if (lock->scope != APR_INTRAPROCESS) {
        if ((stat = apr_unix_unlock_inter(lock)) != APR_SUCCESS) {
            return stat;
        }
    }
    return APR_SUCCESS;
}

apr_status_t apr_lock_destroy(apr_lock_t *lock)
{
    apr_status_t stat;
#if APR_PROCESS_LOCK_IS_GLOBAL /* don't need intra lock for APR_LOCKALL */
    if (lock->scope == APR_INTRAPROCESS) {
#else
    if (lock->scope != APR_CROSS_PROCESS) {
#endif
#if APR_HAS_THREADS
        if ((stat = apr_unix_destroy_intra_lock(lock)) != APR_SUCCESS) {
            return stat;
        }
#else
        if (lock->scope != APR_LOCKALL) {
            return APR_ENOTIMPL;
        }
#endif
    }
    if (lock->scope != APR_INTRAPROCESS) {
        if ((stat = apr_unix_destroy_inter_lock(lock)) != APR_SUCCESS) {
            return stat;
        }
    }
    return APR_SUCCESS;
}

apr_status_t apr_lock_child_init(apr_lock_t **lock, const char *fname, 
                               apr_pool_t *cont)
{
    apr_status_t stat;
    if ((*lock)->scope != APR_INTRAPROCESS) {
        if ((stat = apr_unix_child_init_lock(lock, cont, fname)) != APR_SUCCESS) {
            return stat;
        }
    }
    return APR_SUCCESS;
}

apr_status_t apr_lock_data_get(apr_lock_t *lock, const char *key, void *data)
{
    return apr_pool_userdata_get(data, key, lock->cntxt);
}

apr_status_t apr_lock_data_set(apr_lock_t *lock, void *data, const char *key,
                            apr_status_t (*cleanup) (void *))
{
    return apr_pool_userdata_set(data, key, cleanup, lock->cntxt);
}

apr_status_t apr_os_lock_get(apr_os_lock_t *oslock, apr_lock_t *lock)
{
    oslock->crossproc = lock->interproc;
#if APR_HAS_THREADS
#if APR_USE_PTHREAD_SERIALIZE
    oslock->intraproc = lock->intraproc;
#endif
#endif

    return APR_SUCCESS;
}

apr_status_t apr_os_lock_put(apr_lock_t **lock, apr_os_lock_t *thelock, 
                           apr_pool_t *cont)
{
    if (cont == NULL) {
        return APR_ENOPOOL;
    }
    if ((*lock) == NULL) {
        (*lock) = (apr_lock_t *)apr_pcalloc(cont, sizeof(apr_lock_t));
        (*lock)->cntxt = cont;
    }
    (*lock)->interproc = thelock->crossproc;
#if APR_HAS_THREADS
#if (APR_USE_PTHREAD_SERIALIZE)
    (*lock)->intraproc = thelock->intraproc;
#endif
#endif
    return APR_SUCCESS;
}