mirror of https://code.videolan.org/videolan/vlc
225 lines
7.0 KiB
C
225 lines
7.0 KiB
C
/*****************************************************************************
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* vlc_atomic.h:
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*****************************************************************************
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* Copyright (C) 2010 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 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 License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_ATOMIC_H
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# define VLC_ATOMIC_H
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/**
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* \file
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* Atomic operations do not require locking, but they are not very powerful.
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*/
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/* Clang older versions support atomics but lacks the stdatomic.h header */
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#if defined(__clang__)
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# if !defined(__has_include) || !__has_include(<stdatomic.h>)
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# define __STDC_NO_ATOMICS__ 1
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# endif
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#endif
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# ifndef __cplusplus
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# if (__STDC_VERSION__ >= 201112L) && !defined (__STDC_NO_ATOMICS__)
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/*** Native C11 atomics ***/
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# include <stdatomic.h>
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# else
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/*** Intel/GCC atomics ***/
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# define ATOMIC_FLAG_INIT false
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# define ATOMIC_VAR_INIT(value) (value)
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# define atomic_init(obj, value) \
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do { *(obj) = (value); } while(0)
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# define kill_dependency(y) \
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((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) \
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false
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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 char16_t atomic_char16_t;
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//typedef char32_t atomic_char32_t;
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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(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(object,expected,desired) \
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atomic_compare_exchange(object, expected, desired)
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# define atomic_compare_exchange_strong_explicit(object,expected,desired,order) \
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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(object, expected, desired)
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# define atomic_compare_exchange_weak_explicit(object,expected,desired,order) \
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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, true)
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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, false)
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# define atomic_flag_clear_explicit(object,order) \
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atomic_flag_clear(object)
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# endif /* !C11 */
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typedef atomic_uint_least32_t vlc_atomic_float;
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static inline void vlc_atomic_init_float(vlc_atomic_float *var, float f)
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{
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union { float f; uint32_t i; } u;
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u.f = f;
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atomic_init(var, u.i);
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}
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/** Helper to retrieve a single precision from an atom. */
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static inline float vlc_atomic_load_float(vlc_atomic_float *atom)
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{
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union { float f; uint32_t i; } u;
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u.i = atomic_load(atom);
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return u.f;
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}
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/** Helper to store a single precision into an atom. */
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static inline void vlc_atomic_store_float(vlc_atomic_float *atom, float f)
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{
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union { float f; uint32_t i; } u;
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u.f = f;
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atomic_store(atom, u.i);
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}
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# else /* C++ */
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/*** Native C++11 atomics ***/
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# include <atomic>
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# endif /* C++ */
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#endif
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