1 /*
2 * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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 //
26 // Prioritized queue of VM operations.
27 //
28 // Encapsulates both queue management and
29 // and priority policy
30 //
31 class VMOperationQueue : public CHeapObj {
32 private:
33 enum Priorities {
34 SafepointPriority, // Highest priority (operation executed at a safepoint)
35 MediumPriority, // Medium priority
36 nof_priorities
37 };
38
39 // We maintain a doubled linked list, with explicit count.
40 int _queue_length[nof_priorities];
41 int _queue_counter;
42 VM_Operation* _queue [nof_priorities];
43 // we also allow the vmThread to register the ops it has drained so we
44 // can scan them from oops_do
127 void verify();
128
129 // Performance measurement
130 static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; }
131
132 // Entry for starting vm thread
133 virtual void run();
134
135 // Creations/Destructions
136 static void create();
137 static void destroy();
138
139 private:
140 // VM_Operation support
141 static VM_Operation* _cur_vm_operation; // Current VM operation
142 static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations
143
144 // Pointer to single-instance of VM thread
145 static VMThread* _vm_thread;
146 };
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1 /*
2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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_RUNTIME_VMTHREAD_HPP
26 #define SHARE_VM_RUNTIME_VMTHREAD_HPP
27
28 #include "runtime/perfData.hpp"
29 #include "runtime/vm_operations.hpp"
30 #ifdef TARGET_OS_FAMILY_linux
31 # include "thread_linux.inline.hpp"
32 #endif
33 #ifdef TARGET_OS_FAMILY_solaris
34 # include "thread_solaris.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_windows
37 # include "thread_windows.inline.hpp"
38 #endif
39
40 //
41 // Prioritized queue of VM operations.
42 //
43 // Encapsulates both queue management and
44 // and priority policy
45 //
46 class VMOperationQueue : public CHeapObj {
47 private:
48 enum Priorities {
49 SafepointPriority, // Highest priority (operation executed at a safepoint)
50 MediumPriority, // Medium priority
51 nof_priorities
52 };
53
54 // We maintain a doubled linked list, with explicit count.
55 int _queue_length[nof_priorities];
56 int _queue_counter;
57 VM_Operation* _queue [nof_priorities];
58 // we also allow the vmThread to register the ops it has drained so we
59 // can scan them from oops_do
142 void verify();
143
144 // Performance measurement
145 static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; }
146
147 // Entry for starting vm thread
148 virtual void run();
149
150 // Creations/Destructions
151 static void create();
152 static void destroy();
153
154 private:
155 // VM_Operation support
156 static VM_Operation* _cur_vm_operation; // Current VM operation
157 static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations
158
159 // Pointer to single-instance of VM thread
160 static VMThread* _vm_thread;
161 };
162
163 #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP
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