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_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
27
28 #include "gc_implementation/g1/ptrQueue.hpp"
29
30 class ObjectClosure;
31 class JavaThread;
32 class SATBMarkQueueSet;
33
34 // A ptrQueue whose elements are "oops", pointers to object heads.
35 class ObjPtrQueue: public PtrQueue {
36 friend class SATBMarkQueueSet;
37
38 private:
39 // Filter out unwanted entries from the buffer.
40 void filter();
41
42 // Apply the closure to all elements.
43 void apply_closure(ObjectClosure* cl);
44
45 // Apply the closure to all elements and empty the buffer;
46 void apply_closure_and_empty(ObjectClosure* cl);
47
48 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
49 static void apply_closure_to_buffer(ObjectClosure* cl,
50 void** buf, size_t index, size_t sz);
51
52 public:
53 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
54 // SATB queues are only active during marking cycles. We create
55 // them with their active field set to false. If a thread is
56 // created during a cycle and its SATB queue needs to be activated
101 static void handle_zero_index_for_thread(JavaThread* t);
102
103 // Apply "set_active(active)" to all SATB queues in the set. It should be
104 // called only with the world stopped. The method will assert that the
105 // SATB queues of all threads it visits, as well as the SATB queue
106 // set itself, has an active value same as expected_active.
107 void set_active_all_threads(bool active, bool expected_active);
108
109 // Filter all the currently-active SATB buffers.
110 void filter_thread_buffers();
111
112 // Register "blk" as "the closure" for all queues. Only one such closure
113 // is allowed. The "apply_closure_to_completed_buffer" method will apply
114 // this closure to a completed buffer, and "iterate_closure_all_threads"
115 // applies it to partially-filled buffers (the latter should only be done
116 // with the world stopped).
117 void set_closure(ObjectClosure* closure);
118 // Set the parallel closures: pointer is an array of pointers to
119 // closures, one for each parallel GC thread.
120 void set_par_closure(int i, ObjectClosure* closure);
121
122 // Apply the registered closure to all entries on each
123 // currently-active buffer and then empty the buffer. It should only
124 // be called serially and at a safepoint.
125 void iterate_closure_all_threads();
126 // Parallel version of the above.
127 void par_iterate_closure_all_threads(uint worker);
128
129 // If there exists some completed buffer, pop it, then apply the
130 // registered closure to all its elements, and return true. If no
131 // completed buffers exist, return false.
132 bool apply_closure_to_completed_buffer() {
133 return apply_closure_to_completed_buffer_work(false, 0);
134 }
135 // Parallel version of the above.
136 bool par_apply_closure_to_completed_buffer(uint worker) {
137 return apply_closure_to_completed_buffer_work(true, worker);
138 }
139
140 // Apply the given closure on enqueued and currently-active buffers
141 // respectively. Both methods are read-only, i.e., they do not
142 // modify any of the buffers.
143 void iterate_completed_buffers_read_only(ObjectClosure* cl);
144 void iterate_thread_buffers_read_only(ObjectClosure* cl);
145
146 #ifndef PRODUCT
147 // Helpful for debugging
|
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_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
27
28 #include "gc_implementation/g1/ptrQueue.hpp"
29
30 class ObjectClosure;
31 class JavaThread;
32 class SATBMarkQueueSet;
33
34 // A ptrQueue whose elements are "oops", pointers to object heads.
35 class ObjPtrQueue: public PtrQueue {
36 friend class Threads;
37 friend class SATBMarkQueueSet;
38 friend class G1RemarkThreadsClosure;
39
40 private:
41 // Filter out unwanted entries from the buffer.
42 void filter();
43
44 // Apply the closure to all elements.
45 void apply_closure(ObjectClosure* cl);
46
47 // Apply the closure to all elements and empty the buffer;
48 void apply_closure_and_empty(ObjectClosure* cl);
49
50 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
51 static void apply_closure_to_buffer(ObjectClosure* cl,
52 void** buf, size_t index, size_t sz);
53
54 public:
55 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
56 // SATB queues are only active during marking cycles. We create
57 // them with their active field set to false. If a thread is
58 // created during a cycle and its SATB queue needs to be activated
103 static void handle_zero_index_for_thread(JavaThread* t);
104
105 // Apply "set_active(active)" to all SATB queues in the set. It should be
106 // called only with the world stopped. The method will assert that the
107 // SATB queues of all threads it visits, as well as the SATB queue
108 // set itself, has an active value same as expected_active.
109 void set_active_all_threads(bool active, bool expected_active);
110
111 // Filter all the currently-active SATB buffers.
112 void filter_thread_buffers();
113
114 // Register "blk" as "the closure" for all queues. Only one such closure
115 // is allowed. The "apply_closure_to_completed_buffer" method will apply
116 // this closure to a completed buffer, and "iterate_closure_all_threads"
117 // applies it to partially-filled buffers (the latter should only be done
118 // with the world stopped).
119 void set_closure(ObjectClosure* closure);
120 // Set the parallel closures: pointer is an array of pointers to
121 // closures, one for each parallel GC thread.
122 void set_par_closure(int i, ObjectClosure* closure);
123
124 // If there exists some completed buffer, pop it, then apply the
125 // registered closure to all its elements, and return true. If no
126 // completed buffers exist, return false.
127 bool apply_closure_to_completed_buffer() {
128 return apply_closure_to_completed_buffer_work(false, 0);
129 }
130 // Parallel version of the above.
131 bool par_apply_closure_to_completed_buffer(uint worker) {
132 return apply_closure_to_completed_buffer_work(true, worker);
133 }
134
135 // Apply the given closure on enqueued and currently-active buffers
136 // respectively. Both methods are read-only, i.e., they do not
137 // modify any of the buffers.
138 void iterate_completed_buffers_read_only(ObjectClosure* cl);
139 void iterate_thread_buffers_read_only(ObjectClosure* cl);
140
141 #ifndef PRODUCT
142 // Helpful for debugging
|