Wed, 15 Feb 2012 16:29:40 -0800
7142680: default GC affected by jvm path
Summary: Removed old tiered code
Reviewed-by: never, kvn
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.
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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.
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23 */
25 #ifndef SHARE_VM_RUNTIME_VMTHREAD_HPP
26 #define SHARE_VM_RUNTIME_VMTHREAD_HPP
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 #ifdef TARGET_OS_FAMILY_bsd
40 # include "thread_bsd.inline.hpp"
41 #endif
43 //
44 // Prioritized queue of VM operations.
45 //
46 // Encapsulates both queue management and
47 // and priority policy
48 //
49 class VMOperationQueue : public CHeapObj {
50 private:
51 enum Priorities {
52 SafepointPriority, // Highest priority (operation executed at a safepoint)
53 MediumPriority, // Medium priority
54 nof_priorities
55 };
57 // We maintain a doubled linked list, with explicit count.
58 int _queue_length[nof_priorities];
59 int _queue_counter;
60 VM_Operation* _queue [nof_priorities];
61 // we also allow the vmThread to register the ops it has drained so we
62 // can scan them from oops_do
63 VM_Operation* _drain_list;
65 // Double-linked non-empty list insert.
66 void insert(VM_Operation* q,VM_Operation* n);
67 void unlink(VM_Operation* q);
69 // Basic queue manipulation
70 bool queue_empty (int prio);
71 void queue_add_front (int prio, VM_Operation *op);
72 void queue_add_back (int prio, VM_Operation *op);
73 VM_Operation* queue_remove_front(int prio);
74 void queue_oops_do(int queue, OopClosure* f);
75 void drain_list_oops_do(OopClosure* f);
76 VM_Operation* queue_drain(int prio);
77 // lock-free query: may return the wrong answer but must not break
78 bool queue_peek(int prio) { return _queue_length[prio] > 0; }
80 public:
81 VMOperationQueue();
83 // Highlevel operations. Encapsulates policy
84 bool add(VM_Operation *op);
85 VM_Operation* remove_next(); // Returns next or null
86 VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); }
87 VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); }
88 void set_drain_list(VM_Operation* list) { _drain_list = list; }
89 bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); }
91 // GC support
92 void oops_do(OopClosure* f);
94 void verify_queue(int prio) PRODUCT_RETURN;
95 };
98 //
99 // A single VMThread (the primordial thread) spawns all other threads
100 // and is itself used by other threads to offload heavy vm operations
101 // like scavenge, garbage_collect etc.
102 //
104 class VMThread: public NamedThread {
105 private:
106 static ThreadPriority _current_priority;
108 static bool _should_terminate;
109 static bool _terminated;
110 static Monitor * _terminate_lock;
111 static PerfCounter* _perf_accumulated_vm_operation_time;
113 void evaluate_operation(VM_Operation* op);
114 public:
115 // Constructor
116 VMThread();
118 // Tester
119 bool is_VM_thread() const { return true; }
120 bool is_GC_thread() const { return true; }
122 // The ever running loop for the VMThread
123 void loop();
125 // Called to stop the VM thread
126 static void wait_for_vm_thread_exit();
127 static bool should_terminate() { return _should_terminate; }
128 static bool is_terminated() { return _terminated == true; }
130 // Execution of vm operation
131 static void execute(VM_Operation* op);
133 // Returns the current vm operation if any.
134 static VM_Operation* vm_operation() { return _cur_vm_operation; }
136 // Returns the single instance of VMThread.
137 static VMThread* vm_thread() { return _vm_thread; }
139 // GC support
140 void oops_do(OopClosure* f, CodeBlobClosure* cf);
142 // Debugging
143 void print_on(outputStream* st) const;
144 void print() const { print_on(tty); }
145 void verify();
147 // Performance measurement
148 static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; }
150 // Entry for starting vm thread
151 virtual void run();
153 // Creations/Destructions
154 static void create();
155 static void destroy();
157 private:
158 // VM_Operation support
159 static VM_Operation* _cur_vm_operation; // Current VM operation
160 static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations
162 // Pointer to single-instance of VM thread
163 static VMThread* _vm_thread;
164 };
166 #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP