Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
       3             :  *
       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:
      10             :  *
      11             :  * The above copyright notice and this permission notice shall be included in
      12             :  * all copies or substantial portions of the Software.
      13             :  *
      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
      20             :  * SOFTWARE.
      21             :  */
      22             : 
      23             : /* Definitions for architectures on which loads of given type are       */
      24             : /* atomic (either for suitably aligned data only or for any legal       */
      25             : /* alignment).                                                          */
      26             : 
      27             : AO_INLINE AO_t
      28     1376415 : AO_load(const volatile AO_t *addr)
      29             : {
      30             : # ifdef AO_ACCESS_CHECK_ALIGNED
      31     1376415 :     assert(((size_t)addr & (sizeof(*addr) - 1)) == 0);
      32             : # endif
      33             :   /* Cast away the volatile for architectures like IA64 where   */
      34             :   /* volatile adds barrier (fence) semantics.                   */
      35     1376415 :   return *(const AO_t *)addr;
      36             : }
      37             : #define AO_HAVE_load