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_GC_G1_G1FREEIDSET_HPP
26 #define SHARE_GC_G1_G1FREEIDSET_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/semaphore.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 // Represents a set of free small integer ids.
33 class G1FreeIdSet : public CHeapObj<mtGC> {
34 Semaphore _sem;
35 uint* _next;
36 uint _start;
37 uint _size;
38 uintx _head_index_mask;
39 volatile uintx _head;
40
41 uint head_index(uintx head) const;
42 uintx make_head(uint index, uintx old_head) const;
43
44 // Noncopyable.
45 G1FreeIdSet(const G1FreeIdSet&);
46 G1FreeIdSet& operator=(const G1FreeIdSet&);
47
48 public:
49 G1FreeIdSet(uint start, uint size);
50 ~G1FreeIdSet();
51
52 // Returns an unclaimed parallel id (waiting for one to be released if
|
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_GC_G1_G1FREEIDSET_HPP
26 #define SHARE_GC_G1_G1FREEIDSET_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/semaphore.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 // Represents a set of small integer ids, from which elements can be
33 // temporarily allocated for exclusive use. The ids are in a
34 // contiguous range from 'start' to 'start + size'. Used to obtain a
35 // distinct worker_id value for a mutator thread that doesn't normally
36 // have such an id.
37 class G1FreeIdSet : public CHeapObj<mtGC> {
38 Semaphore _sem;
39 uint* _next;
40 uint _start;
41 uint _size;
42 uintx _head_index_mask;
43 volatile uintx _head;
44
45 uint head_index(uintx head) const;
46 uintx make_head(uint index, uintx old_head) const;
47
48 // Noncopyable.
49 G1FreeIdSet(const G1FreeIdSet&);
50 G1FreeIdSet& operator=(const G1FreeIdSet&);
51
52 public:
53 G1FreeIdSet(uint start, uint size);
54 ~G1FreeIdSet();
55
56 // Returns an unclaimed parallel id (waiting for one to be released if
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