9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jfr/recorder/storage/jfrStorageControl.hpp"
27 #include "runtime/atomic.hpp"
28 #include "runtime/mutexLocker.hpp"
29 #include "runtime/orderAccess.inline.hpp"
30
31 // returns the updated value
32 static jlong atomic_add(size_t value, size_t volatile* const dest) {
33 size_t compare_value;
34 size_t exchange_value;
35 do {
36 compare_value = OrderAccess::load_acquire(dest);
37 exchange_value = compare_value + value;
38 } while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
39 return exchange_value;
40 }
41
42 static jlong atomic_dec(size_t volatile* const dest) {
43 size_t compare_value;
44 size_t exchange_value;
45 do {
46 compare_value = OrderAccess::load_acquire(dest);
47 assert(compare_value >= 1, "invariant");
48 exchange_value = compare_value - 1;
49 } while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jfr/recorder/storage/jfrStorageControl.hpp"
27 #include "runtime/atomic.hpp"
28 #include "runtime/mutexLocker.hpp"
29 #include "runtime/orderAccess.hpp"
30
31 // returns the updated value
32 static jlong atomic_add(size_t value, size_t volatile* const dest) {
33 size_t compare_value;
34 size_t exchange_value;
35 do {
36 compare_value = OrderAccess::load_acquire(dest);
37 exchange_value = compare_value + value;
38 } while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
39 return exchange_value;
40 }
41
42 static jlong atomic_dec(size_t volatile* const dest) {
43 size_t compare_value;
44 size_t exchange_value;
45 do {
46 compare_value = OrderAccess::load_acquire(dest);
47 assert(compare_value >= 1, "invariant");
48 exchange_value = compare_value - 1;
49 } while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
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