2 * Copyright (c) 2003-2004 Hewlett-Packard Development Company, L.P.
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * This file adds definitions appropriate for environments in which an unsigned char
25 * volatile load has acquire semantics, and an unsigned char volatile store has release
26 * semantics. This is true with the standard Itanium ABI.
28 #if !defined(AO_GCC_BARRIER)
29 # if defined(__GNUC__)
30 # define AO_GCC_BARRIER() AO_compiler_barrier()
32 # define AO_GCC_BARRIER()
36 AO_INLINE unsigned char
37 AO_char_load_acquire(volatile unsigned char *p)
39 unsigned char result = *p;
40 /* A normal volatile load generates an ld.acq */
44 #define AO_HAVE_char_load_acquire
47 AO_char_store_release(volatile unsigned char *p, unsigned char val)
50 /* A normal volatile store generates an st.rel */
53 #define AO_HAVE_char_store_release