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 #ifndef SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
26 #define SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/semaphore.hpp"
30
31 // Except for the barrier tag it self, it uses two counter to keep the semaphore
32 // count correct and not leave any late thread hanging.
33 class GenericWaitBarrier : public CHeapObj<mtInternal> {
34 volatile int _barrier_tag;
35 // The number of threads waiting on or about to wait on the semaphore.
36 volatile int _waiters;
37 // The number of threads in the wait path, before or after the tag check.
38 // Which means it can become a waiter.
39 volatile int _barrier_threads;
40 Semaphore _sem_barrier;
41
42 // Prevent copying and assignment of GenericWaitBarrier instances.
43 GenericWaitBarrier(const GenericWaitBarrier&);
44 GenericWaitBarrier& operator=(const GenericWaitBarrier&);
45
46 int wake_if_needed();
47
48 public:
49 GenericWaitBarrier() : _barrier_tag(0), _waiters(0), _barrier_threads(0), _sem_barrier(0) {}
50 ~GenericWaitBarrier() {}
51
52 const char* description() { return "semaphore"; }
53
54 void arm(int barrier_tag);
55 void disarm();
56 void wake();
57 void wait(int barrier_tag);
58 };
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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 #ifndef SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
26 #define SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/semaphore.hpp"
30
31 // Except for the barrier tag itself, it uses two counters to keep the semaphore
32 // count correct and not leave any late thread waiting.
33 class GenericWaitBarrier : public CHeapObj<mtInternal> {
34 volatile int _barrier_tag;
35 // The number of threads waiting on or about to wait on the semaphore.
36 volatile int _waiters;
37 // The number of threads in the wait path, before or after the tag check.
38 // These threads can become waiters.
39 volatile int _barrier_threads;
40 Semaphore _sem_barrier;
41
42 // Prevent copying and assignment of GenericWaitBarrier instances.
43 GenericWaitBarrier(const GenericWaitBarrier&);
44 GenericWaitBarrier& operator=(const GenericWaitBarrier&);
45
46 int wake_if_needed();
47
48 public:
49 GenericWaitBarrier() : _barrier_tag(0), _waiters(0), _barrier_threads(0), _sem_barrier(0) {}
50 ~GenericWaitBarrier() {}
51
52 const char* description() { return "semaphore"; }
53
54 void arm(int barrier_tag);
55 void disarm();
56 void wake();
57 void wait(int barrier_tag);
58 };
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