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comparison src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp @ 4132:6d7d0790074d

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7119584: UseParallelGC barrier task can be overwritten. Summary: Provoke a GC for a metadata allocation failure. Reviewed-by: johnc, iveresov
author jmasa
date Fri, 09 Dec 2011 19:28:34 -0800
parents bca17e38de00
children d2a62e0f25eb
comparison
equal deleted inserted replaced
4131:e9b91fd07263 4132:6d7d0790074d
1 1
2 /* 2 /*
3 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 * 5 *
6 * This code is free software; you can redistribute it and/or modify it 6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as 7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation. 8 * published by the Free Software Foundation.
127 HandleMark hm_inner; 127 HandleMark hm_inner;
128 ResourceMark rm_inner; 128 ResourceMark rm_inner;
129 for (; /* break */; ) { 129 for (; /* break */; ) {
130 // This will block until there is a task to be gotten. 130 // This will block until there is a task to be gotten.
131 GCTask* task = manager()->get_task(which()); 131 GCTask* task = manager()->get_task(which());
132 // Record if this is an idle task for later use.
133 bool is_idle_task = task->is_idle_task();
132 // In case the update is costly 134 // In case the update is costly
133 if (PrintGCTaskTimeStamps) { 135 if (PrintGCTaskTimeStamps) {
134 timer.update(); 136 timer.update();
135 } 137 }
136 138
137 jlong entry_time = timer.ticks(); 139 jlong entry_time = timer.ticks();
138 char* name = task->name(); 140 char* name = task->name();
139 141
142 // If this is the barrier task, it can be destroyed
143 // by the GC task manager once the do_it() executes.
140 task->do_it(manager(), which()); 144 task->do_it(manager(), which());
141 145
142 if (!task->is_idle_task()) { 146 // Use the saved value of is_idle_task because references
147 // using "task" are not reliable for the barrier task.
148 if (!is_idle_task) {
143 manager()->note_completion(which()); 149 manager()->note_completion(which());
144 150
145 if (PrintGCTaskTimeStamps) { 151 if (PrintGCTaskTimeStamps) {
146 assert(_time_stamps != NULL, 152 assert(_time_stamps != NULL,
147 "Sanity (PrintGCTaskTimeStamps set late?)"); 153 "Sanity (PrintGCTaskTimeStamps set late?)");