atomic.hpp revision 1472
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
public:
// Atomically store to a location
// Atomically add to a location, return updated value
// Atomically increment location
// Atomically decrement a location
// Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
static unsigned int xchg(unsigned int exchange_value,
volatile unsigned int* dest);
// Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
// if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
// barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
static unsigned int cmpxchg(unsigned int exchange_value,
volatile unsigned int* dest,
unsigned int compare_value);
static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
};