8 *
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 #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 and empty the buffer;
45 void apply_closure_and_empty(ObjectClosure* cl);
46
47 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
48 static void apply_closure_to_buffer(ObjectClosure* cl,
49 void** buf, size_t index, size_t sz);
50
51 public:
52 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
53 // SATB queues are only active during marking cycles. We create
54 // them with their active field set to false. If a thread is
55 // created during a cycle and its SATB queue needs to be activated
56 // before the thread starts running, we'll need to set its active
57 // field to true. This is done in JavaThread::initialize_queues().
58 PtrQueue(qset, perm, false /* active */) { }
59
60 // Process queue entries and free resources.
61 void flush();
62
63 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
64 // definition for more information.
65 virtual bool should_enqueue_buffer();
66
67 #ifndef PRODUCT
68 // Helpful for debugging
69 void print(const char* name);
70 static void print(const char* name, void** buf, size_t index, size_t sz);
71 #endif // PRODUCT
72 };
73
74 class SATBMarkQueueSet: public PtrQueueSet {
75 ObjPtrQueue _shared_satb_queue;
76
77 #ifdef ASSERT
78 void dump_active_states(bool expected_active);
79 void verify_active_states(bool expected_active);
80 #endif // ASSERT
81
82 public:
83 SATBMarkQueueSet();
84
85 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
86 int process_completed_threshold,
87 Mutex* lock);
88
89 static void handle_zero_index_for_thread(JavaThread* t);
90
91 // Apply "set_active(active)" to all SATB queues in the set. It should be
92 // called only with the world stopped. The method will assert that the
93 // SATB queues of all threads it visits, as well as the SATB queue
94 // set itself, has an active value same as expected_active.
95 void set_active_all_threads(bool active, bool expected_active);
96
97 // Filter all the currently-active SATB buffers.
98 void filter_thread_buffers();
99
100 // If there exists some completed buffer, pop it, then apply the
101 // closure to all its elements, and return true. If no
102 // completed buffers exist, return false.
103 bool apply_closure_to_completed_buffer(ObjectClosure* closure);
104
105 #ifndef PRODUCT
106 // Helpful for debugging
107 void print_all(const char* msg);
108 #endif // PRODUCT
109
110 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
111
112 // If a marking is being abandoned, reset any unprocessed log buffers.
113 void abandon_partial_marking();
114 };
115
116 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
|
8 *
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
27
28 #include "memory/allocation.hpp"
29 #include "gc_implementation/g1/ptrQueue.hpp"
30
31 class JavaThread;
32 class SATBMarkQueueSet;
33
34 // Base class for processing the contents of a SATB buffer.
35 class SATBBufferClosure : public StackObj {
36 protected:
37 ~SATBBufferClosure() { }
38
39 public:
40 // Process the SATB entries in the designated buffer range.
41 virtual void do_buffer(void** buffer, size_t size) = 0;
42 };
43
44 // A ptrQueue whose elements are "oops", pointers to object heads.
45 class ObjPtrQueue: public PtrQueue {
46 friend class SATBMarkQueueSet;
47
48 private:
49 // Filter out unwanted entries from the buffer.
50 void filter();
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
57 // before the thread starts running, we'll need to set its active
58 // field to true. This is done in JavaThread::initialize_queues().
59 PtrQueue(qset, perm, false /* active */) { }
60
61 // Process queue entries and free resources.
62 void flush();
63
64 // Apply cl to the active part of the buffer.
65 // Prerequisite: Must be at a safepoint.
66 void apply_closure_and_empty(SATBBufferClosure* cl);
67
68 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
69 // definition for more information.
70 virtual bool should_enqueue_buffer();
71
72 #ifndef PRODUCT
73 // Helpful for debugging
74 void print(const char* name);
75 static void print(const char* name, void** buf, size_t index, size_t sz);
76 #endif // PRODUCT
77 };
78
79 class SATBMarkQueueSet: public PtrQueueSet {
80 ObjPtrQueue _shared_satb_queue;
81
82 #ifdef ASSERT
83 void dump_active_states(bool expected_active);
84 void verify_active_states(bool expected_active);
85 #endif // ASSERT
86
87 public:
88 SATBMarkQueueSet();
89
90 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
91 int process_completed_threshold,
92 Mutex* lock);
93
94 static void handle_zero_index_for_thread(JavaThread* t);
95
96 // Apply "set_active(active)" to all SATB queues in the set. It should be
97 // called only with the world stopped. The method will assert that the
98 // SATB queues of all threads it visits, as well as the SATB queue
99 // set itself, has an active value same as expected_active.
100 void set_active_all_threads(bool active, bool expected_active);
101
102 // Filter all the currently-active SATB buffers.
103 void filter_thread_buffers();
104
105 // If there exists some completed buffer, pop and process it, and
106 // return true. Otherwise return false. Processing a buffer
107 // consists of applying the closure to the buffer range starting
108 // with the first non-NULL entry to the end of the buffer; the
109 // leading entries may be NULL due to filtering.
110 bool apply_closure_to_completed_buffer(SATBBufferClosure* cl);
111
112 #ifndef PRODUCT
113 // Helpful for debugging
114 void print_all(const char* msg);
115 #endif // PRODUCT
116
117 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
118
119 // If a marking is being abandoned, reset any unprocessed log buffers.
120 void abandon_partial_marking();
121 };
122
123 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
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