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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/*
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* Copyright (c) 2016-2020 Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef POOL_H
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#define POOL_H
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#if defined (__cplusplus)
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extern "C" {
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#endif
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#include <stddef.h> /* size_t */
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typedef struct POOL_ctx_s POOL_ctx;
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/*! POOL_create() :
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* Create a thread pool with at most `numThreads` threads.
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* `numThreads` must be at least 1.
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* The maximum number of queued jobs before blocking is `queueSize`.
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* @return : POOL_ctx pointer on success, else NULL.
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*/
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POOL_ctx* POOL_create(size_t numThreads, size_t queueSize);
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/*! POOL_free() :
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* Free a thread pool returned by POOL_create().
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*/
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void POOL_free(POOL_ctx* ctx);
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/*! POOL_resize() :
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* Expands or shrinks pool's number of threads.
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* This is more efficient than releasing + creating a new context,
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* since it tries to preserve and re-use existing threads.
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* `numThreads` must be at least 1.
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* @return : 0 when resize was successful,
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* !0 (typically 1) if there is an error.
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* note : only numThreads can be resized, queueSize remains unchanged.
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*/
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int POOL_resize(POOL_ctx* ctx, size_t numThreads);
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/*! POOL_sizeof() :
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* @return threadpool memory usage
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* note : compatible with NULL (returns 0 in this case)
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*/
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size_t POOL_sizeof(POOL_ctx* ctx);
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/*! POOL_function :
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* The function type that can be added to a thread pool.
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*/
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typedef void (*POOL_function)(void*);
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/*! POOL_add() :
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* Add the job `function(opaque)` to the thread pool. `ctx` must be valid.
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* Possibly blocks until there is room in the queue.
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* Note : The function may be executed asynchronously,
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* therefore, `opaque` must live until function has been completed.
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*/
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void POOL_add(POOL_ctx* ctx, POOL_function function, void* opaque);
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/*! POOL_tryAdd() :
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* Add the job `function(opaque)` to thread pool _if_ a worker is available.
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* Returns immediately even if not (does not block).
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* @return : 1 if successful, 0 if not.
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*/
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int POOL_tryAdd(POOL_ctx* ctx, POOL_function function, void* opaque);
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#if defined (__cplusplus)
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}
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#endif
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#endif
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