From 65f1d45dcc71186ede72fff950996099d23359bd Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Sun, 2 Dec 2012 14:34:50 -0800 Subject: lavu: add support for atomic operations. 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 --- libavutil/atomic_win32.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 libavutil/atomic_win32.h (limited to 'libavutil/atomic_win32.h') diff --git a/libavutil/atomic_win32.h b/libavutil/atomic_win32.h new file mode 100644 index 0000000000..6ae61f6c4d --- /dev/null +++ b/libavutil/atomic_win32.h @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2012 Ronald S. Bultje + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "atomic.h" + +#define avpriv_atomic_int_get atomic_int_get_win32 +static inline int atomic_int_get_win32(volatile int *ptr) +{ + MemoryBarrier(); + return *ptr; +} + +#define avpriv_atomic_int_set atomic_int_set_win32 +static inline void atomic_int_set_win32(volatile int *ptr, int val) +{ + *ptr = val; + MemoryBarrier(); +} + +#define avpriv_atomic_int_add_and_fetch atomic_int_add_and_fetch_win32 +static inline int atomic_int_add_and_fetch_win32(volatile int *ptr, int inc) +{ + return inc + InterlockedExchangeAdd(ptr, inc); +} + +#define avpriv_atomic_ptr_cas atomic_ptr_cas_win32 +static inline void *atomic_ptr_cas_win32(void * volatile *ptr, + void *oldval, void *newval) +{ + return InterlockedCompareExchangePointer(ptr, newval, oldval); +} -- cgit v1.2.3