author | rkennke |
Tue, 02 Apr 2019 18:13:42 +0200 | |
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parent 53244 | 9807daeb47c4 |
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/* |
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* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. |
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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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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHHEAPLOCK_HPP |
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#define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPLOCK_HPP |
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#include "memory/allocation.hpp" |
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#include "runtime/thread.hpp" |
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class ShenandoahHeapLock { |
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private: |
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enum LockState { unlocked = 0, locked = 1 }; |
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DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int)); |
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volatile int _state; |
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DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile Thread*)); |
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volatile Thread* _owner; |
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DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, 0); |
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public: |
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ShenandoahHeapLock() : _state(unlocked), _owner(NULL) {}; |
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void lock() { |
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Thread::SpinAcquire(&_state, "Shenandoah Heap Lock"); |
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#ifdef ASSERT |
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assert(_state == locked, "must be locked"); |
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assert(_owner == NULL, "must not be owned"); |
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_owner = Thread::current(); |
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#endif |
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} |
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void unlock() { |
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#ifdef ASSERT |
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assert (_owner == Thread::current(), "sanity"); |
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_owner = NULL; |
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#endif |
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Thread::SpinRelease(&_state); |
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} |
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#ifdef ASSERT |
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void assert_owned_by_current_thread() { |
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assert(_state == locked, "must be locked"); |
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assert(_owner == Thread::current(), "must be owned by current thread"); |
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} |
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void assert_not_owned_by_current_thread() { |
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assert(_owner != Thread::current(), "must be not owned by current thread"); |
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} |
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void assert_owned_by_current_thread_or_safepoint() { |
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Thread* thr = Thread::current(); |
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assert((_state == locked && _owner == thr) || |
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(SafepointSynchronize::is_at_safepoint() && thr->is_VM_thread()), |
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"must own heap lock or by VM thread at safepoint"); |
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} |
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#endif |
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}; |
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class ShenandoahHeapLocker : public StackObj { |
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private: |
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ShenandoahHeapLock* _lock; |
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public: |
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ShenandoahHeapLocker(ShenandoahHeapLock* lock) { |
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_lock = lock; |
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_lock->lock(); |
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} |
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~ShenandoahHeapLocker() { |
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_lock->unlock(); |
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} |
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}; |
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAPLOCK_HPP |