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Add a compat stdatomic.h implementation based on GCC atomics
Adapted from the code by Rémi Denis-Courmont from VLC
This merges libav commit 4e928ef340.
Signed-off-by: Wan-Teh Chang <wtc@google.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Anton Khirnov
James Almer
parent
4059cd3952
commit
3359eede8f
173
compat/atomics/gcc/stdatomic.h
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173
compat/atomics/gcc/stdatomic.h
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/*
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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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/*
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* based on vlc_atomic.h from VLC
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* Copyright (C) 2010 Rémi Denis-Courmont
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*/
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#ifndef FFMPEG_COMPAT_ATOMICS_GCC_STDATOMIC_H
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#define FFMPEG_COMPAT_ATOMICS_GCC_STDATOMIC_H
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#include <stddef.h>
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#include <stdint.h>
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#define ATOMIC_FLAG_INIT 0
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#define ATOMIC_VAR_INIT(value) (value)
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#define atomic_init(obj, value) \
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do { \
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*(obj) = (value); \
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} while(0)
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#define kill_dependency(y) ((void)0)
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#define atomic_thread_fence(order) \
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__sync_synchronize()
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#define atomic_signal_fence(order) \
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((void)0)
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#define atomic_is_lock_free(obj) 0
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typedef _Bool atomic_flag;
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typedef _Bool atomic_bool;
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typedef char atomic_char;
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typedef signed char atomic_schar;
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typedef unsigned char atomic_uchar;
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typedef short atomic_short;
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typedef unsigned short atomic_ushort;
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typedef int atomic_int;
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typedef unsigned int atomic_uint;
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typedef long atomic_long;
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typedef unsigned long atomic_ulong;
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typedef long long atomic_llong;
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typedef unsigned long long atomic_ullong;
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typedef wchar_t atomic_wchar_t;
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typedef int_least8_t atomic_int_least8_t;
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typedef uint_least8_t atomic_uint_least8_t;
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typedef int_least16_t atomic_int_least16_t;
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typedef uint_least16_t atomic_uint_least16_t;
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typedef int_least32_t atomic_int_least32_t;
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typedef uint_least32_t atomic_uint_least32_t;
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typedef int_least64_t atomic_int_least64_t;
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typedef uint_least64_t atomic_uint_least64_t;
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typedef int_fast8_t atomic_int_fast8_t;
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typedef uint_fast8_t atomic_uint_fast8_t;
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typedef int_fast16_t atomic_int_fast16_t;
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typedef uint_fast16_t atomic_uint_fast16_t;
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typedef int_fast32_t atomic_int_fast32_t;
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typedef uint_fast32_t atomic_uint_fast32_t;
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typedef int_fast64_t atomic_int_fast64_t;
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typedef uint_fast64_t atomic_uint_fast64_t;
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typedef intptr_t atomic_intptr_t;
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typedef uintptr_t atomic_uintptr_t;
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typedef size_t atomic_size_t;
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typedef ptrdiff_t atomic_ptrdiff_t;
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typedef intmax_t atomic_intmax_t;
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typedef uintmax_t atomic_uintmax_t;
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#define atomic_store(object, desired) \
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do { \
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*(object) = (desired); \
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__sync_synchronize(); \
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} while (0)
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#define atomic_store_explicit(object, desired, order) \
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atomic_store(object, desired)
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#define atomic_load(object) \
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(__sync_synchronize(), *(object))
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#define atomic_load_explicit(object, order) \
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atomic_load(object)
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#define atomic_exchange(object, desired) \
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({ \
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typeof(object) _obj = (object); \
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typeof(*object) _old; \
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do \
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_old = atomic_load(_obj); \
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while (!__sync_bool_compare_and_swap(_obj, _old, (desired))); \
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_old; \
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})
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#define atomic_exchange_explicit(object, desired, order) \
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atomic_exchange(object, desired)
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#define atomic_compare_exchange_strong(object, expected, desired) \
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({ \
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typeof(object) _exp = (expected); \
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typeof(*object) _old = *_exp; \
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*_exp = __sync_val_compare_and_swap((object), _old, (desired)); \
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*_exp == _old; \
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})
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#define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \
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atomic_compare_exchange_strong(object, expected, desired)
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#define atomic_compare_exchange_weak(object, expected, desired) \
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atomic_compare_exchange_strong(object, expected, desired)
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#define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \
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atomic_compare_exchange_weak(object, expected, desired)
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#define atomic_fetch_add(object, operand) \
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__sync_fetch_and_add(object, operand)
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#define atomic_fetch_add_explicit(object, operand, order) \
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atomic_fetch_add(object, operand)
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#define atomic_fetch_sub(object, operand) \
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__sync_fetch_and_sub(object, operand)
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#define atomic_fetch_sub_explicit(object, operand, order) \
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atomic_fetch_sub(object, operand)
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#define atomic_fetch_or(object, operand) \
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__sync_fetch_and_or(object, operand)
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#define atomic_fetch_or_explicit(object, operand, order) \
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atomic_fetch_or(object, operand)
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#define atomic_fetch_xor(object, operand) \
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__sync_fetch_and_sub(object, operand)
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#define atomic_fetch_xor_explicit(object, operand, order) \
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atomic_fetch_sub(object, operand)
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#define atomic_fetch_and(object, operand) \
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__sync_fetch_and_and(object, operand)
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#define atomic_fetch_and_explicit(object, operand, order) \
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atomic_fetch_and(object, operand)
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#define atomic_flag_test_and_set(object) \
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atomic_exchange(object, 1)
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#define atomic_flag_test_and_set_explicit(object, order) \
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atomic_flag_test_and_set(object)
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#define atomic_flag_clear(object) \
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atomic_store(object, 0)
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#define atomic_flag_clear_explicit(object, order) \
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atomic_flag_clear(object)
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#endif /* FFMPEG_COMPAT_ATOMICS_GCC_STDATOMIC_H */
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6
configure
vendored
6
configure
vendored
@ -6381,6 +6381,12 @@ for thread in $THREADS_LIST; do
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fi
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done
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if disabled stdatomic_h; then
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if enabled atomics_gcc; then
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add_cppflags '-I\$(SRC_PATH)/compat/atomics/gcc'
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fi
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fi
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enabled zlib && add_cppflags -DZLIB_CONST
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# conditional library dependencies, in linking order
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