114 lines
3.8 KiB
C
114 lines
3.8 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 xf86atomics.h
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*
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* Private definitions for atomic operations
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*/
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#ifndef LIBDRM_ATOMICS_H
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#define LIBDRM_ATOMICS_H
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#if HAVE_LIBDRM_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_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
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# define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0)
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# define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
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# define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
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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 HAVE_LIB_ATOMIC_OPS
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#include <atomic_ops.h>
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#define HAS_ATOMIC_OPS 1
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typedef struct {
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AO_t atomic;
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} atomic_t;
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# define atomic_read(x) AO_load_full(&(x)->atomic)
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# define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
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# define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
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# define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1)
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# define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v)))
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# define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v)))
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# define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
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# define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
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#endif
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#if (defined(__sun) || defined(__NetBSD__)) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris & NetBSD */
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#include <sys/atomic.h>
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#define HAS_ATOMIC_OPS 1
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#if defined(__NetBSD__)
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#define LIBDRM_ATOMIC_TYPE int
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#else
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#define LIBDRM_ATOMIC_TYPE uint_t
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#endif
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typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t;
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# define atomic_read(x) (int) ((x)->atomic)
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# define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val))
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# define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
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# define atomic_inc_return(x) (atomic_inc_uint_nv(&(x)->atomic))
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# define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0)
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# define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
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# define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
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# define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
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#endif
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#if !defined(HAS_ATOMIC_OPS)
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#error libdrm requires atomic operations, please define them for your CPU/compiler.
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#endif
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static inline int atomic_add_unless(atomic_t *v, int add, int unless)
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{
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int c, old;
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c = atomic_read(v);
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while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c)
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c = old;
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return c == unless;
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}
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#endif
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