62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* Copyright © 2009 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Chris Wilson <chris@chris-wilson.co.uk>
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*
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*/
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/**
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* @file intel_atomics.h
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*
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* Private definitions for atomic operations
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*/
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#ifndef INTEL_ATOMICS_H
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#define INTEL_ATOMICS_H
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if HAVE_INTEL_ATOMIC_PRIMITIVES
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#define HAS_ATOMIC_OPS 1
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typedef struct {
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int atomic;
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} atomic_t;
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# define atomic_read(x) ((x)->atomic)
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# define atomic_set(x, val) ((x)->atomic = (val))
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# define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
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# define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1)
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# define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
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#endif
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#if ! HAS_ATOMIC_OPS
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#error libdrm-intel requires atomic operations, please define them for your CPU/compiler.
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#endif
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#endif
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