/* 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.
 */

#include "apr.h"
#include "apr_private.h"
#include "apr_portable.h"
#include "apr_arch_proc_mutex.h"
#include "apr_arch_thread_mutex.h"

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_status_t ret;
    apr_proc_mutex_t *new_mutex;
    unsigned int flags = APR_THREAD_MUTEX_DEFAULT;

    *mutex = NULL;
    if (mech == APR_LOCK_DEFAULT_TIMED) {
        flags |= APR_THREAD_MUTEX_TIMED;
    }
    else if (mech != APR_LOCK_DEFAULT) {
        return APR_ENOTIMPL;
    }

    new_mutex = (apr_proc_mutex_t *)apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
    if (new_mutex == NULL) {
        return APR_ENOMEM;
    }     
    
    new_mutex->pool = pool;
    ret = apr_thread_mutex_create(&(new_mutex->mutex), flags, pool);

    if (ret == APR_SUCCESS)
        *mutex = new_mutex;

    return ret;
}

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)
{
    if (mutex)
        return apr_thread_mutex_lock(mutex->mutex);
    return APR_ENOLOCK;
}

APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex)
{
    if (mutex)
        return apr_thread_mutex_trylock(mutex->mutex);
    return APR_ENOLOCK;
}

APR_DECLARE(apr_status_t) apr_proc_mutex_timedlock(apr_thread_mutex_t *mutex,
                                                   apr_time_t timeout,
                                                   int absolute)
{
    if (mutex)
        return apr_thread_mutex_timedlock(mutex->mutex, timeout, absolute);
    return APR_ENOLOCK;
}

APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex)
{
    if (mutex)
        return apr_thread_mutex_unlock(mutex->mutex);
    return APR_ENOLOCK;
}

APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex)
{
    return apr_proc_mutex_destroy(mutex);
}

APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex)
{
    if (mutex)
        return apr_thread_mutex_destroy(mutex->mutex);
    return APR_ENOLOCK;
}

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 "netwarethread";
}

APR_DECLARE(const char *) apr_proc_mutex_defname(void)
{
    return "netwarethread";
}

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)
{
    if (!pmutex->mutex) {
        return APR_ENOLOCK;
    }

    *ospmutex = pmutex->mutex->mutex;
    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) {
        return APR_ENOTIMPL;
    }

    if ((*pmutex) == NULL) {
        (*pmutex) = apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
        (*pmutex)->pool = pool;
    }
    (*pmutex)->mutex = apr_pcalloc(pool, sizeof(apr_thread_mutex_t));
    (*pmutex)->mutex->mutex = *ospmutex;
    (*pmutex)->mutex->pool = pool;

    if (register_cleanup) {
        apr_pool_cleanup_register(pool, *pmutex, apr_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);
}