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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2008 Blender Foundation.
* All rights reserved.
*/
#pragma once
/** \file
* \ingroup bli
*
* Shared logic for #BLI_task_parallel_mempool to create a threaded iterator,
* without exposing the these functions publicly.
*/
#include "BLI_compiler_attrs.h"
#include "BLI_mempool.h"
#include "BLI_task.h"
typedef struct BLI_mempool_threadsafe_iter {
BLI_mempool_iter iter;
struct BLI_mempool_chunk **curchunk_threaded_shared;
} BLI_mempool_threadsafe_iter;
typedef struct ParallelMempoolTaskData {
BLI_mempool_threadsafe_iter ts_iter;
TaskParallelTLS tls;
} ParallelMempoolTaskData;
/**
* Initialize an array of mempool iterators, #BLI_MEMPOOL_ALLOW_ITER flag must be set.
*
* This is used in threaded code, to generate as much iterators as needed
* (each task should have its own),
* such that each iterator goes over its own single chunk,
* and only getting the next chunk to iterate over has to be
* protected against concurrency (which can be done in a lock-less way).
*
* To be used when creating a task for each single item in the pool is totally overkill.
*
* See #BLI_task_parallel_mempool implementation for detailed usage example.
*/
ParallelMempoolTaskData *mempool_iter_threadsafe_create(BLI_mempool *pool, const size_t num_iter)
ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
void mempool_iter_threadsafe_destroy(ParallelMempoolTaskData *iter_arr) ATTR_NONNULL();
/**
* A version of #BLI_mempool_iterstep that uses
* #BLI_mempool_threadsafe_iter.curchunk_threaded_shared for threaded iteration support.
* (threaded section noted in comments).
*/
void *mempool_iter_threadsafe_step(BLI_mempool_threadsafe_iter *iter);
#ifdef __cplusplus
}
#endif
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