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505d298e81
These can be used to implement some kind of flow control in the caller. E.g. unless pthreadpool_queued_jobs() is lower than pthreadpool_max_threads() is good to prepare new jobs. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* threadpool implementation based on pthreads
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* Copyright (C) Volker Lendecke 2009,2011
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __PTHREADPOOL_H__
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#define __PTHREADPOOL_H__
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struct pthreadpool;
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/**
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* @defgroup pthreadpool The pthreadpool API
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*
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* This API provides a way to run threadsafe functions in a helper
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* thread. It is initially intended to run getaddrinfo asynchronously.
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*/
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/**
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* @brief Create a pthreadpool
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*
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* A struct pthreadpool is the basis for for running threads in the
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* background.
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*
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* @param[in] max_threads Maximum parallelism in this pool
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* @param[out] presult Pointer to the threadpool returned
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* @return success: 0, failure: errno
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*
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* max_threads=0 means unlimited parallelism. The caller has to take
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* care to not overload the system.
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*/
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int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult,
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int (*signal_fn)(int jobid,
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void (*job_fn)(void *private_data),
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void *job_fn_private_data,
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void *private_data),
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void *signal_fn_private_data);
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/**
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* @brief Get the max threads value of pthreadpool
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*
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* @note This can be 0 for strict sync processing.
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*
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* @param[in] pool The pool
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* @return number of possible threads
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*/
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size_t pthreadpool_max_threads(struct pthreadpool *pool);
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/**
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* @brief The number of queued jobs of pthreadpool
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*
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* This is the number of jobs added by pthreadpool_add_job(),
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* which are not yet processed by a thread.
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*
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* @param[in] pool The pool
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* @return The number of jobs
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*/
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size_t pthreadpool_queued_jobs(struct pthreadpool *pool);
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/**
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* @brief Destroy a pthreadpool
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*
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* Destroy a pthreadpool. If jobs are submitted, but not yet active in
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* a thread, they won't get executed. If a job has already been
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* submitted to a thread, the job function will continue running, and
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* the signal function might still be called. The caller of
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* pthreadpool_init must make sure the required resources are still
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* around when the pool is destroyed with pending jobs. The last
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* thread to exit will finally free() the pool memory.
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*
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* @param[in] pool The pool to destroy
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* @return success: 0, failure: errno
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*/
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int pthreadpool_destroy(struct pthreadpool *pool);
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/**
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* @brief Add a job to a pthreadpool
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*
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* This adds a job to a pthreadpool. The job can be identified by
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* job_id. This integer will be passed to signal_fn() when the
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* job is completed.
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*
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* @param[in] pool The pool to run the job on
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* @param[in] job_id A custom identifier
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* @param[in] fn The function to run asynchronously
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* @param[in] private_data Pointer passed to fn
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* @return success: 0, failure: errno
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*/
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int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
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void (*fn)(void *private_data), void *private_data);
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#endif
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