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65f1d45dcc
These could be used for reference counting, or for keeping track of decoding progress in references in multithreaded decoders. Support is provided by gcc/msvc/suncc intrinsics, with a fallback using pthread mutexes. Signed-off-by: Anton Khirnov <anton@khirnov.net>
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
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* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include <windows.h>
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#include "atomic.h"
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#define avpriv_atomic_int_get atomic_int_get_win32
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static inline int atomic_int_get_win32(volatile int *ptr)
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{
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MemoryBarrier();
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return *ptr;
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}
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#define avpriv_atomic_int_set atomic_int_set_win32
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static inline void atomic_int_set_win32(volatile int *ptr, int val)
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{
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*ptr = val;
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MemoryBarrier();
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}
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#define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_win32
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static inline int atomic_int_add_and_fetch_win32(volatile int *ptr, int inc)
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{
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return inc + InterlockedExchangeAdd(ptr, inc);
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}
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#define avpriv_atomic_ptr_cas atomic_ptr_cas_win32
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static inline void *atomic_ptr_cas_win32(void * volatile *ptr,
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void *oldval, void *newval)
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{
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return InterlockedCompareExchangePointer(ptr, newval, oldval);
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}
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