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/*
* Copyright (C) 2013-2020 Argonne National Laboratory, Department of Energy,
* UChicago Argonne, LLC and The HDF Group.
* All rights reserved.
*
* The full copyright notice, including terms governing use, modification,
* and redistribution, is contained in the COPYING file that can be
* found at the root of the source code distribution tree.
*/
#ifndef MERCURY_THREAD_POOL_H
#define MERCURY_THREAD_POOL_H
#include "mercury_queue.h"
#include "mercury_thread.h"
#include "mercury_thread_condition.h"
/*************************************/
/* Public Type and Struct Definition */
/*************************************/
typedef struct hg_thread_pool hg_thread_pool_t;
struct hg_thread_pool {
unsigned int sleeping_worker_count;
HG_QUEUE_HEAD(hg_thread_work) queue;
int shutdown;
hg_thread_mutex_t mutex;
hg_thread_cond_t cond;
};
struct hg_thread_work {
hg_thread_func_t func;
void * args;
HG_QUEUE_ENTRY(hg_thread_work) entry; /* Internal */
};
/*****************/
/* Public Macros */
/*****************/
/*********************/
/* Public Prototypes */
/*********************/
#ifdef __cplusplus
extern "C" {
#endif
/**
* Initialize the thread pool.
*
* \param thread_count [IN] number of threads that will be created at
* initialization
* \param pool [OUT] pointer to pool object
*
* \return Non-negative on success or negative on failure
*/
HG_UTIL_PUBLIC int hg_thread_pool_init(unsigned int thread_count, hg_thread_pool_t **pool);
/**
* Destroy the thread pool.
*
* \param pool [IN/OUT] pointer to pool object
*
* \return Non-negative on success or negative on failure
*/
HG_UTIL_PUBLIC int hg_thread_pool_destroy(hg_thread_pool_t *pool);
/**
* Post work to the pool. Note that the operation may be queued depending on
* the number of threads and number of tasks already running.
*
* \param pool [IN/OUT] pointer to pool object
* \param work [IN] pointer to work struct
*
* \return Non-negative on success or negative on failure
*/
static HG_UTIL_INLINE int hg_thread_pool_post(hg_thread_pool_t *pool, struct hg_thread_work *work);
/*---------------------------------------------------------------------------*/
static HG_UTIL_INLINE int
hg_thread_pool_post(hg_thread_pool_t *pool, struct hg_thread_work *work)
{
int ret = HG_UTIL_SUCCESS;
if (!pool || !work)
return HG_UTIL_FAIL;
if (!work->func)
return HG_UTIL_FAIL;
hg_thread_mutex_lock(&pool->mutex);
/* Are we shutting down ? */
if (pool->shutdown) {
ret = HG_UTIL_FAIL;
goto unlock;
}
/* Add task to task queue */
HG_QUEUE_PUSH_TAIL(&pool->queue, work, entry);
/* Wake up sleeping worker */
if (pool->sleeping_worker_count && (hg_thread_cond_signal(&pool->cond) != HG_UTIL_SUCCESS))
ret = HG_UTIL_FAIL;
unlock:
hg_thread_mutex_unlock(&pool->mutex);
return ret;
}
#ifdef __cplusplus
}
#endif
#endif /* MERCURY_THREAD_POOL_H */
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