Mercurial > hg > truffle
annotate src/share/vm/runtime/vmThread.hpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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 | |
0 | 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 | |
60 VM_Operation* _drain_list; | |
61 | |
62 // Double-linked non-empty list insert. | |
63 void insert(VM_Operation* q,VM_Operation* n); | |
64 void unlink(VM_Operation* q); | |
65 | |
66 // Basic queue manipulation | |
67 bool queue_empty (int prio); | |
68 void queue_add_front (int prio, VM_Operation *op); | |
69 void queue_add_back (int prio, VM_Operation *op); | |
70 VM_Operation* queue_remove_front(int prio); | |
71 void queue_oops_do(int queue, OopClosure* f); | |
72 void drain_list_oops_do(OopClosure* f); | |
73 VM_Operation* queue_drain(int prio); | |
74 // lock-free query: may return the wrong answer but must not break | |
75 bool queue_peek(int prio) { return _queue_length[prio] > 0; } | |
76 | |
77 public: | |
78 VMOperationQueue(); | |
79 | |
80 // Highlevel operations. Encapsulates policy | |
81 bool add(VM_Operation *op); | |
82 VM_Operation* remove_next(); // Returns next or null | |
83 VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); } | |
84 VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); } | |
85 void set_drain_list(VM_Operation* list) { _drain_list = list; } | |
86 bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); } | |
87 | |
88 // GC support | |
89 void oops_do(OopClosure* f); | |
90 | |
91 void verify_queue(int prio) PRODUCT_RETURN; | |
92 }; | |
93 | |
94 | |
95 // | |
96 // A single VMThread (the primordial thread) spawns all other threads | |
97 // and is itself used by other threads to offload heavy vm operations | |
98 // like scavenge, garbage_collect etc. | |
99 // | |
100 | |
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101 class VMThread: public NamedThread { |
0 | 102 private: |
103 static ThreadPriority _current_priority; | |
104 | |
105 static bool _should_terminate; | |
106 static bool _terminated; | |
107 static Monitor * _terminate_lock; | |
108 static PerfCounter* _perf_accumulated_vm_operation_time; | |
109 | |
110 void evaluate_operation(VM_Operation* op); | |
111 public: | |
112 // Constructor | |
113 VMThread(); | |
114 | |
115 // Tester | |
116 bool is_VM_thread() const { return true; } | |
117 bool is_GC_thread() const { return true; } | |
118 | |
119 // The ever running loop for the VMThread | |
120 void loop(); | |
121 | |
122 // Called to stop the VM thread | |
123 static void wait_for_vm_thread_exit(); | |
124 static bool should_terminate() { return _should_terminate; } | |
125 static bool is_terminated() { return _terminated == true; } | |
126 | |
127 // Execution of vm operation | |
128 static void execute(VM_Operation* op); | |
129 | |
130 // Returns the current vm operation if any. | |
131 static VM_Operation* vm_operation() { return _cur_vm_operation; } | |
132 | |
133 // Returns the single instance of VMThread. | |
134 static VMThread* vm_thread() { return _vm_thread; } | |
135 | |
136 // GC support | |
989 | 137 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 138 |
139 // Debugging | |
140 void print_on(outputStream* st) const; | |
141 void print() const { print_on(tty); } | |
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 }; | |
1972 | 162 |
163 #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP |