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annotate src/share/vm/runtime/vmThread.hpp @ 21445:567fd5394b80
NodeLIRBuilder#getExactPhiKind: handle non-java constants.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 21 May 2015 11:51:32 +0200 |
parents | 7848fc12602b |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, 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" | |
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29 #include "runtime/thread.inline.hpp" |
1972 | 30 #include "runtime/vm_operations.hpp" |
31 | |
0 | 32 // |
33 // Prioritized queue of VM operations. | |
34 // | |
35 // Encapsulates both queue management and | |
36 // and priority policy | |
37 // | |
6197 | 38 class VMOperationQueue : public CHeapObj<mtInternal> { |
0 | 39 private: |
40 enum Priorities { | |
41 SafepointPriority, // Highest priority (operation executed at a safepoint) | |
42 MediumPriority, // Medium priority | |
43 nof_priorities | |
44 }; | |
45 | |
46 // We maintain a doubled linked list, with explicit count. | |
47 int _queue_length[nof_priorities]; | |
48 int _queue_counter; | |
49 VM_Operation* _queue [nof_priorities]; | |
50 // we also allow the vmThread to register the ops it has drained so we | |
51 // can scan them from oops_do | |
52 VM_Operation* _drain_list; | |
53 | |
54 // Double-linked non-empty list insert. | |
55 void insert(VM_Operation* q,VM_Operation* n); | |
56 void unlink(VM_Operation* q); | |
57 | |
58 // Basic queue manipulation | |
59 bool queue_empty (int prio); | |
60 void queue_add_front (int prio, VM_Operation *op); | |
61 void queue_add_back (int prio, VM_Operation *op); | |
62 VM_Operation* queue_remove_front(int prio); | |
63 void queue_oops_do(int queue, OopClosure* f); | |
64 void drain_list_oops_do(OopClosure* f); | |
65 VM_Operation* queue_drain(int prio); | |
66 // lock-free query: may return the wrong answer but must not break | |
67 bool queue_peek(int prio) { return _queue_length[prio] > 0; } | |
68 | |
69 public: | |
70 VMOperationQueue(); | |
71 | |
72 // Highlevel operations. Encapsulates policy | |
73 bool add(VM_Operation *op); | |
74 VM_Operation* remove_next(); // Returns next or null | |
75 VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); } | |
76 VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); } | |
77 void set_drain_list(VM_Operation* list) { _drain_list = list; } | |
78 bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); } | |
79 | |
80 // GC support | |
81 void oops_do(OopClosure* f); | |
82 | |
83 void verify_queue(int prio) PRODUCT_RETURN; | |
84 }; | |
85 | |
86 | |
87 // | |
88 // A single VMThread (the primordial thread) spawns all other threads | |
89 // and is itself used by other threads to offload heavy vm operations | |
90 // like scavenge, garbage_collect etc. | |
91 // | |
92 | |
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93 class VMThread: public NamedThread { |
0 | 94 private: |
95 static ThreadPriority _current_priority; | |
96 | |
97 static bool _should_terminate; | |
98 static bool _terminated; | |
99 static Monitor * _terminate_lock; | |
100 static PerfCounter* _perf_accumulated_vm_operation_time; | |
101 | |
102 void evaluate_operation(VM_Operation* op); | |
103 public: | |
104 // Constructor | |
105 VMThread(); | |
106 | |
107 // Tester | |
108 bool is_VM_thread() const { return true; } | |
109 bool is_GC_thread() const { return true; } | |
110 | |
111 // The ever running loop for the VMThread | |
112 void loop(); | |
113 | |
114 // Called to stop the VM thread | |
115 static void wait_for_vm_thread_exit(); | |
116 static bool should_terminate() { return _should_terminate; } | |
117 static bool is_terminated() { return _terminated == true; } | |
118 | |
119 // Execution of vm operation | |
120 static void execute(VM_Operation* op); | |
121 | |
122 // Returns the current vm operation if any. | |
123 static VM_Operation* vm_operation() { return _cur_vm_operation; } | |
124 | |
125 // Returns the single instance of VMThread. | |
126 static VMThread* vm_thread() { return _vm_thread; } | |
127 | |
128 // GC support | |
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129 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
0 | 130 |
131 // Debugging | |
132 void print_on(outputStream* st) const; | |
133 void print() const { print_on(tty); } | |
134 void verify(); | |
135 | |
136 // Performance measurement | |
137 static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; } | |
138 | |
139 // Entry for starting vm thread | |
140 virtual void run(); | |
141 | |
142 // Creations/Destructions | |
143 static void create(); | |
144 static void destroy(); | |
145 | |
146 private: | |
147 // VM_Operation support | |
148 static VM_Operation* _cur_vm_operation; // Current VM operation | |
149 static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations | |
150 | |
151 // Pointer to single-instance of VM thread | |
152 static VMThread* _vm_thread; | |
153 }; | |
1972 | 154 |
155 #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP |