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73 lines
2.4 KiB
73 lines
2.4 KiB
/*****************************************************************************
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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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/** Static initializer for \ref vlc_atomic_t */
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# define VLC_ATOMIC_INIT(val) { (val) }
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/* All functions return the atom value _after_ the operation. */
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VLC_API uintptr_t vlc_atomic_get(const vlc_atomic_t *);
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VLC_API uintptr_t vlc_atomic_set(vlc_atomic_t *, uintptr_t);
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VLC_API uintptr_t vlc_atomic_add(vlc_atomic_t *, uintptr_t);
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static inline uintptr_t vlc_atomic_sub (vlc_atomic_t *atom, uintptr_t v)
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{
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return vlc_atomic_add (atom, -v);
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}
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static inline uintptr_t vlc_atomic_inc (vlc_atomic_t *atom)
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{
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return vlc_atomic_add (atom, 1);
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}
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static inline uintptr_t vlc_atomic_dec (vlc_atomic_t *atom)
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{
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return vlc_atomic_sub (atom, 1);
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}
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VLC_API uintptr_t vlc_atomic_swap(vlc_atomic_t *, uintptr_t);
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VLC_API uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *, uintptr_t, uintptr_t);
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/** Helper to retrieve a single precision from an atom. */
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static inline float vlc_atomic_getf(const vlc_atomic_t *atom)
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{
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union { float f; uintptr_t i; } u;
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u.i = vlc_atomic_get(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 float vlc_atomic_setf(vlc_atomic_t *atom, float f)
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{
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union { float f; uintptr_t i; } u;
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u.f = f;
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vlc_atomic_set(atom, u.i);
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return f;
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}
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#endif
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