1 /* 2 * Copyright (c) 2015, 2018, 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_HPP 25 #define SHARE_GC_Z_ZLOCK_HPP 26 27 #include "memory/allocation.hpp" 28 #include <pthread.h> 29 30 class ZLock { 31 private: 32 pthread_mutex_t _lock; 33 34 public: 35 ZLock(); 36 ~ZLock(); 37 38 void lock(); 39 bool try_lock(); 40 void unlock(); 41 }; 42 43 class ZReentrantLock { 44 private: 45 ZLock _lock; 46 Thread* volatile _owner; 47 uint64_t _count; 48 49 public: 50 ZReentrantLock(); 51 52 void lock(); 53 void unlock(); 54 55 bool is_owned() const; 56 }; 57 58 template <typename T> 59 class ZLocker : public StackObj { 60 private: 61 T* const _lock; 62 63 public: 64 ZLocker(T* lock); 65 ~ZLocker(); 66 }; 67 68 #endif // SHARE_GC_Z_ZLOCK_HPP