IABSD.fr/xenocara/lib/libdrm/xf86atomic.h

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• Author : jsg
  Date : 2018-09-13 12:02:27
  Hash : d4accf84
  Message : Merge libdrm 2.4.94

• lib/libdrm/xf86atomic.h

• /*
   * 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
  #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