1 /* 2 * Copyright (c) 2015, 2019, 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 #ifndef SHARE_GC_Z_ZLOCK_INLINE_HPP 25 #define SHARE_GC_Z_ZLOCK_INLINE_HPP 26 27 #include "gc/z/zLock.hpp" 28 #include "runtime/atomic.hpp" 29 #include "runtime/os.inline.hpp" 30 #include "runtime/thread.hpp" 31 #include "utilities/debug.hpp" 32 33 inline void ZLock::lock() { 34 _lock.lock(); 35 } 36 37 inline bool ZLock::try_lock() { 38 return _lock.try_lock(); 39 } 40 41 inline void ZLock::unlock() { 42 _lock.unlock(); 43 } 44 45 inline ZReentrantLock::ZReentrantLock() : 46 _lock(), 47 _owner(NULL), 48 _count(0) {} 49 50 inline void ZReentrantLock::lock() { 51 Thread* const thread = Thread::current(); 52 Thread* const owner = Atomic::load(&_owner); 53 54 if (owner != thread) { 55 _lock.lock(); 56 Atomic::store(thread, &_owner); 57 } 58 59 _count++; 60 } 61 62 inline void ZReentrantLock::unlock() { 63 assert(is_owned(), "Invalid owner"); 64 assert(_count > 0, "Invalid count"); 65 66 _count--; 67 68 if (_count == 0) { 69 Atomic::store((Thread*)NULL, &_owner); 70 _lock.unlock(); 71 } 72 } 73 74 inline bool ZReentrantLock::is_owned() const { 75 Thread* const thread = Thread::current(); 76 Thread* const owner = Atomic::load(&_owner); 77 return owner == thread; 78 } 79 80 template <typename T> 81 inline ZLocker<T>::ZLocker(T* lock) : 82 _lock(lock) { 83 _lock->lock(); 84 } 85 86 template <typename T> 87 inline ZLocker<T>::~ZLocker() { 88 _lock->unlock(); 89 } 90 91 #endif // SHARE_GC_Z_ZLOCK_INLINE_HPP