/*
 * 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.
 */

#ifndef AXIS2_THREAD_POOL_H
#define AXIS2_THREAD_POOL_H

/**
 * @file axis2_thread_pool.h
 * @brief Axis2 thread pool interface
 */

#include <axis2_utils_defines.h>
#include <axis2_allocator.h>
#include <axis2_thread.h>

#ifdef __cplusplus
extern "C"
{
#endif

/**
 * @defgroup axis2_thread_pool thread pool
 * @ingroup axis2_util 
 * @{
 */
 
typedef struct axis2_thread_pool_ops axis2_thread_pool_ops_t;
typedef struct axis2_thread_pool axis2_thread_pool_t;
struct axis2_env;

/** 
  * \brief Axis2 thread_pool
  *
  * Encapsulator for thread pooling routines
  */
 struct axis2_thread_pool_ops
{
  /**
   * Retrives a thread from the thread pool
   * @param func function to be executed in the new thread
   * @param data arguments to be passed to the function
   * @return pointer to a thread in ready state.
   */
   axis2_thread_t * (AXIS2_CALL *
   get_thread) (axis2_thread_pool_t *pool, 
             axis2_thread_start_t func, 
                 void *data);
  /**
   * Blocks until the desired thread stops executing.
   * @param thd The thread to joined
   * @return status of the operation
   */
   axis2_status_t (AXIS2_CALL *
   join_thread) (axis2_thread_pool_t *pool, 
              axis2_thread_t *thd);
  /**
   * Stop the execution of current thread
   * @param thd thread to be stopped
   * @return status of the operation
   */
   axis2_status_t (AXIS2_CALL *
   exit_thread) (axis2_thread_pool_t *pool, 
              axis2_thread_t *thd);
  /**
   * Detaches a thread
   * @param thd thread to be detached
   * @return status of the operation
   */
   axis2_status_t (AXIS2_CALL *
   thread_detach) (axis2_thread_pool_t *pool, 
               axis2_thread_t *thd);
  /**
   * Frees resources used by thread_pool
   * @param pool thread_pool to be freed
   */
   axis2_status_t (AXIS2_CALL *
   free) (axis2_thread_pool_t *pool);
};

/**
 * @brief Thread Pool struct
 * Axis2 Thread Pool
 */
 struct axis2_thread_pool
{
   axis2_thread_pool_ops_t *ops;
};
/**
* Initializes (creates) an thread_pool.
* @param allocator user defined allocator for the memory allocation.
* @return initialized thread_pool. NULL on error.
*/
AXIS2_EXTERN axis2_thread_pool_t * AXIS2_CALL axis2_thread_pool_init(
               axis2_allocator_t *allocator);

/**
 * This function can be used to initialize the environment in case of 
 * spawning a new thread via a thread function
 */
AXIS2_EXTERN struct axis2_env * AXIS2_CALL
axis2_init_thread_env(const struct axis2_env *system_env);

/**
 * This function can be used to free the environment that was used  
 * in a thread function
 */
AXIS2_EXTERN void AXIS2_CALL
axis2_free_thread_env(struct axis2_env *thread_env);

#define AXIS2_THREAD_POOL_GET_THREAD(thread_pool, func, data) \
      ((thread_pool)->ops->get_thread(thread_pool, func, data))

#define AXIS2_THREAD_POOL_JOIN_THREAD(thread_pool, thd) \
      ((thread_pool)->ops->join_thread(thread_pool, thd))

#define AXIS2_THREAD_POOL_EXIT_THREAD(thread_pool, thd) \
      ((thread_pool)->ops->exit_thread(thread_pool, thd))

#define AXIS2_THREAD_POOL_THREAD_DETACH(thread_pool, thd) \
      ((thread_pool)->ops->thread_detach(thread_pool, thd))

#define AXIS2_THREAD_POOL_FREE(thread_pool) \
      ((thread_pool)->ops->free(thread_pool))

/** @} */
    
#ifdef __cplusplus
}
#endif

#endif    /* AXIS2_THREAD_POOL_H */