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comparison: src/share/vm/runtime/vmThread.hpp
src/share/vm/runtime/vmThread.hpp
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| 1 /* | |
| 2 * Copyright (c) 1998, 2012, 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/thread.inline.hpp" | |
| 30 #include "runtime/vm_operations.hpp" | |
| 31 | |
| 32 // | |
| 33 // Prioritized queue of VM operations. | |
| 34 // | |
| 35 // Encapsulates both queue management and | |
| 36 // and priority policy | |
| 37 // | |
| 38 class VMOperationQueue : public CHeapObj<mtInternal> { | |
| 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 | |
| 93 class VMThread: public NamedThread { | |
| 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 | |
| 129 void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf); | |
| 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 }; | |
| 154 | |
| 155 #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP |
