author | stefank |
Thu, 22 Feb 2018 18:36:32 +0100 | |
changeset 49048 | 4e8c86b75428 |
parent 47216 | 71c04702a3d5 |
child 54623 | 1126f0607c70 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/shared/concurrentGCPhaseManager.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/thread.hpp" |
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|
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#define assert_ConcurrentGC_thread() \ |
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assert(Thread::current()->is_ConcurrentGC_thread(), "precondition") |
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|
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#define assert_not_enter_unconstrained(phase) \ |
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assert((phase) != UNCONSTRAINED_PHASE, "Cannot enter \"unconstrained\" phase") |
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#define assert_manager_is_tos(manager, stack, kind) \ |
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assert((manager) == (stack)->_top, kind " manager is not top of stack") |
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ConcurrentGCPhaseManager::Stack::Stack() : |
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_requested_phase(UNCONSTRAINED_PHASE), |
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_top(NULL) |
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{ } |
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ConcurrentGCPhaseManager::ConcurrentGCPhaseManager(int phase, Stack* stack) : |
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_phase(phase), |
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_active(true), |
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_prev(NULL), |
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_stack(stack) |
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{ |
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assert_ConcurrentGC_thread(); |
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assert_not_enter_unconstrained(phase); |
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assert(stack != NULL, "precondition"); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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if (stack->_top != NULL) { |
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assert(stack->_top->_active, "precondition"); |
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_prev = stack->_top; |
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} |
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stack->_top = this; |
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ml.notify_all(); |
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} |
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|
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ConcurrentGCPhaseManager::~ConcurrentGCPhaseManager() { |
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assert_ConcurrentGC_thread(); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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assert_manager_is_tos(this, _stack, "This"); |
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wait_when_requested_impl(); |
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_stack->_top = _prev; |
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ml.notify_all(); |
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} |
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bool ConcurrentGCPhaseManager::is_requested() const { |
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assert_ConcurrentGC_thread(); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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assert_manager_is_tos(this, _stack, "This"); |
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return _active && (_stack->_requested_phase == _phase); |
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} |
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bool ConcurrentGCPhaseManager::wait_when_requested_impl() const { |
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assert_ConcurrentGC_thread(); |
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assert_lock_strong(CGCPhaseManager_lock); |
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bool waited = false; |
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while (_active && (_stack->_requested_phase == _phase)) { |
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waited = true; |
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CGCPhaseManager_lock->wait(Mutex::_no_safepoint_check_flag); |
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} |
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return waited; |
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} |
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bool ConcurrentGCPhaseManager::wait_when_requested() const { |
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assert_ConcurrentGC_thread(); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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assert_manager_is_tos(this, _stack, "This"); |
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return wait_when_requested_impl(); |
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} |
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void ConcurrentGCPhaseManager::set_phase(int phase, bool force) { |
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assert_ConcurrentGC_thread(); |
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assert_not_enter_unconstrained(phase); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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assert_manager_is_tos(this, _stack, "This"); |
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if (!force) wait_when_requested_impl(); |
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_phase = phase; |
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ml.notify_all(); |
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} |
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void ConcurrentGCPhaseManager::deactivate() { |
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assert_ConcurrentGC_thread(); |
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MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); |
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assert_manager_is_tos(this, _stack, "This"); |
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_active = false; |
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ml.notify_all(); |
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} |
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bool ConcurrentGCPhaseManager::wait_for_phase(int phase, Stack* stack) { |
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assert(Thread::current()->is_Java_thread(), "precondition"); |
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assert(stack != NULL, "precondition"); |
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MonitorLockerEx ml(CGCPhaseManager_lock); |
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// Update request and notify service of change. |
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if (stack->_requested_phase != phase) { |
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stack->_requested_phase = phase; |
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ml.notify_all(); |
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} |
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if (phase == UNCONSTRAINED_PHASE) { |
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return true; |
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} |
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// Wait until phase or IDLE is active. |
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while (true) { |
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bool idle = false; |
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for (ConcurrentGCPhaseManager* manager = stack->_top; |
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manager != NULL; |
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manager = manager->_prev) { |
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if (manager->_phase == phase) { |
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return true; // phase is active. |
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} else if (manager->_phase == IDLE_PHASE) { |
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137 |
idle = true; // Note idle active, continue search for phase. |
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138 |
} |
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139 |
} |
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140 |
if (idle) { |
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141 |
return false; // idle is active and phase is not. |
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142 |
} else { |
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143 |
ml.wait(); // Wait for phase change. |
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|
144 |
} |
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parents:
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|
145 |
} |
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146 |
} |