Mercurial > hg > graal-compiler
comparison src/share/vm/runtime/vmThread.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 148e5441d916 |
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1 /* | |
2 * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any 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 | |
45 VM_Operation* _drain_list; | |
46 | |
47 // Double-linked non-empty list insert. | |
48 void insert(VM_Operation* q,VM_Operation* n); | |
49 void unlink(VM_Operation* q); | |
50 | |
51 // Basic queue manipulation | |
52 bool queue_empty (int prio); | |
53 void queue_add_front (int prio, VM_Operation *op); | |
54 void queue_add_back (int prio, VM_Operation *op); | |
55 VM_Operation* queue_remove_front(int prio); | |
56 void queue_oops_do(int queue, OopClosure* f); | |
57 void drain_list_oops_do(OopClosure* f); | |
58 VM_Operation* queue_drain(int prio); | |
59 // lock-free query: may return the wrong answer but must not break | |
60 bool queue_peek(int prio) { return _queue_length[prio] > 0; } | |
61 | |
62 public: | |
63 VMOperationQueue(); | |
64 | |
65 // Highlevel operations. Encapsulates policy | |
66 bool add(VM_Operation *op); | |
67 VM_Operation* remove_next(); // Returns next or null | |
68 VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); } | |
69 VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); } | |
70 void set_drain_list(VM_Operation* list) { _drain_list = list; } | |
71 bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); } | |
72 | |
73 // GC support | |
74 void oops_do(OopClosure* f); | |
75 | |
76 void verify_queue(int prio) PRODUCT_RETURN; | |
77 }; | |
78 | |
79 | |
80 // | |
81 // A single VMThread (the primordial thread) spawns all other threads | |
82 // and is itself used by other threads to offload heavy vm operations | |
83 // like scavenge, garbage_collect etc. | |
84 // | |
85 | |
86 class VMThread: public Thread { | |
87 private: | |
88 static ThreadPriority _current_priority; | |
89 | |
90 static bool _should_terminate; | |
91 static bool _terminated; | |
92 static Monitor * _terminate_lock; | |
93 static PerfCounter* _perf_accumulated_vm_operation_time; | |
94 | |
95 void evaluate_operation(VM_Operation* op); | |
96 public: | |
97 // Constructor | |
98 VMThread(); | |
99 | |
100 // Tester | |
101 bool is_VM_thread() const { return true; } | |
102 bool is_GC_thread() const { return true; } | |
103 | |
104 char* name() const { return (char*)"VM Thread"; } | |
105 | |
106 // The ever running loop for the VMThread | |
107 void loop(); | |
108 | |
109 // Called to stop the VM thread | |
110 static void wait_for_vm_thread_exit(); | |
111 static bool should_terminate() { return _should_terminate; } | |
112 static bool is_terminated() { return _terminated == true; } | |
113 | |
114 // Execution of vm operation | |
115 static void execute(VM_Operation* op); | |
116 | |
117 // Returns the current vm operation if any. | |
118 static VM_Operation* vm_operation() { return _cur_vm_operation; } | |
119 | |
120 // Returns the single instance of VMThread. | |
121 static VMThread* vm_thread() { return _vm_thread; } | |
122 | |
123 // GC support | |
124 void oops_do(OopClosure* f); | |
125 | |
126 // Debugging | |
127 void print_on(outputStream* st) const; | |
128 void print() const { print_on(tty); } | |
129 void verify(); | |
130 | |
131 // Performance measurement | |
132 static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; } | |
133 | |
134 // Entry for starting vm thread | |
135 virtual void run(); | |
136 | |
137 // Creations/Destructions | |
138 static void create(); | |
139 static void destroy(); | |
140 | |
141 private: | |
142 // VM_Operation support | |
143 static VM_Operation* _cur_vm_operation; // Current VM operation | |
144 static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations | |
145 | |
146 // Pointer to single-instance of VM thread | |
147 static VMThread* _vm_thread; | |
148 }; |