author | stefank |
Mon, 25 Nov 2019 12:22:13 +0100 | |
changeset 59247 | 56bf71d64d51 |
parent 53244 | 9807daeb47c4 |
child 59290 | 97d13893ec3c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 2019, 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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#ifndef SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP |
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#define SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP |
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#include "runtime/atomic.hpp" |
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#include "runtime/orderAccess.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "utilities/globalCounter.hpp" |
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||
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inline GlobalCounter::CSContext |
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GlobalCounter::critical_section_begin(Thread *thread) { |
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assert(thread == Thread::current(), "must be current thread"); |
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uintx old_cnt = Atomic::load(thread->get_rcu_counter()); |
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// Retain the old counter value if already active, e.g. nested. |
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// Otherwise, set the counter to the current version + active bit. |
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uintx new_cnt = old_cnt; |
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if ((new_cnt & COUNTER_ACTIVE) == 0) { |
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new_cnt = Atomic::load(&_global_counter._counter) | COUNTER_ACTIVE; |
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} |
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Atomic::release_store_fence(thread->get_rcu_counter(), new_cnt); |
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return static_cast<CSContext>(old_cnt); |
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} |
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inline void |
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GlobalCounter::critical_section_end(Thread *thread, CSContext context) { |
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assert(thread == Thread::current(), "must be current thread"); |
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assert((*thread->get_rcu_counter() & COUNTER_ACTIVE) == COUNTER_ACTIVE, "must be in critical section"); |
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// Restore the counter value from before the associated begin. |
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Atomic::release_store(thread->get_rcu_counter(), |
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static_cast<uintx>(context)); |
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} |
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class GlobalCounter::CriticalSection { |
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private: |
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Thread* _thread; |
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CSContext _context; |
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public: |
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inline CriticalSection(Thread* thread) : |
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_thread(thread), |
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_context(GlobalCounter::critical_section_begin(_thread)) |
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{} |
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inline ~CriticalSection() { |
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GlobalCounter::critical_section_end(_thread, _context); |
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} |
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}; |
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#endif // SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP |