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xf86atomic.h
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xf86atomic.h
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/*
* Copyright © 2009 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
/**
* @file xf86atomics.h
*
* Private definitions for atomic operations
*/
#ifndef LIBDRM_ATOMICS_H
#define LIBDRM_ATOMICS_H
#if HAVE_LIBDRM_ATOMIC_PRIMITIVES
#define HAS_ATOMIC_OPS 1
typedef struct {
int atomic;
} atomic_t;
# define atomic_read(x) ((x)->atomic)
# define atomic_set(x, val) ((x)->atomic = (val))
# define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
# define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
# define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0)
# define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
# define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
# define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
#endif
#if HAVE_LIB_ATOMIC_OPS
#define AO_REQUIRE_CAS
#include <atomic_ops.h>
#define HAS_ATOMIC_OPS 1
typedef struct {
AO_t atomic;
} atomic_t;
# define atomic_read(x) AO_load_full(&(x)->atomic)
# define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
# define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
# define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1)
# define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v)))
# define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v)))
# define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
# define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
#endif
#if (defined(__sun) || defined(__NetBSD__)) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris & NetBSD */
#include <sys/atomic.h>
#define HAS_ATOMIC_OPS 1
#if defined(__NetBSD__)
#define LIBDRM_ATOMIC_TYPE int
#else
#define LIBDRM_ATOMIC_TYPE uint_t
#endif
typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t;
# define atomic_read(x) (int) ((x)->atomic)
# define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val))
# define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
# define atomic_inc_return(x) (atomic_inc_uint_nv(&(x)->atomic))
# define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0)
# define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
# define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
# define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
#endif
#if !defined(HAS_ATOMIC_OPS)
#error libdrm requires atomic operations, please define them for your CPU/compiler.
#endif
static inline int atomic_add_unless(atomic_t *v, int add, int unless)
{
int c, old;
c = atomic_read(v);
while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c)
c = old;
return c != unless;
}
#endif