You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.8 KiB
115 lines
3.8 KiB
4 months ago
|
/*
|
||
|
|
* 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
|