a4f7fabc26
We have more mutexes/condition variables whose initialization is unchecked. Also use a proper namespace for these functions. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
67 lines
3.0 KiB
C
67 lines
3.0 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_PTHREAD_INTERNAL_H
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#define AVCODEC_PTHREAD_INTERNAL_H
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#include "avcodec.h"
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/* H.264 slice threading seems to be buggy with more than 16 threads,
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* limit the number of threads to 16 for automatic detection */
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#define MAX_AUTO_THREADS 16
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int ff_slice_thread_init(AVCodecContext *avctx);
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void ff_slice_thread_free(AVCodecContext *avctx);
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int ff_frame_thread_init(AVCodecContext *avctx);
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void ff_frame_thread_free(AVCodecContext *avctx, int thread_count);
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#define THREAD_SENTINEL 0 // This forbids putting a mutex/condition variable at the front.
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/**
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* Initialize/destroy a list of mutexes/conditions contained in a structure.
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* The positions of these mutexes/conditions in the structure are given by
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* their offsets. Because it is undefined behaviour to destroy
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* an uninitialized mutex/condition, ff_pthread_init() stores the number
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* of successfully initialized mutexes and conditions in the object itself
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* and ff_pthread_free() uses this number to destroy exactly the mutexes and
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* condition variables that have been successfully initialized.
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*
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* @param obj The object containing the mutexes/conditions.
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* @param[in] offsets An array of offsets. Its first member gives the offset
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* of the variable that contains the count of successfully
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* initialized mutexes/condition variables; said variable
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* must be an unsigned int. Two arrays of offsets, each
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* delimited by a THREAD_SENTINEL follow. The first
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* contains the offsets of all the mutexes, the second
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* contains the offsets of all the condition variables.
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*/
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int ff_pthread_init(void *obj, const unsigned offsets[]);
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void ff_pthread_free(void *obj, const unsigned offsets[]);
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/**
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* Macros to help creating the above lists. mutexes and conds need
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* to be parentheses-enclosed lists of offsets in the containing structure.
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*/
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#define OFFSET_ARRAY(...) __VA_ARGS__, THREAD_SENTINEL
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#define DEFINE_OFFSET_ARRAY(type, name, cnt_variable, mutexes, conds) \
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static const unsigned name ## _offsets[] = { offsetof(type, cnt_variable), \
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OFFSET_ARRAY mutexes, \
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OFFSET_ARRAY conds }
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#endif // AVCODEC_PTHREAD_INTERNAL_H
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