1 /* 2 * Copyright (c) 2016, 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 25 #ifndef SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP 26 #define SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP 27 28 #include "jfr/writers/jfrStorageHost.inline.hpp" 29 30 #ifdef ASSERT 31 class ExclusiveAccessAssert { 32 private: 33 bool _acquired; 34 public: 35 ExclusiveAccessAssert() : _acquired(false) {} 36 void acquire() { assert_non_acquired(); _acquired = true; } 37 void release() { assert_acquired(); _acquired = false; } 38 bool is_acquired() const { return _acquired; } 39 void assert_acquired() const { assert(_acquired, "Not acquired!"); } 40 void assert_non_acquired() const { assert(!_acquired, "Already acquired!"); } 41 }; 42 #else 43 class ExclusiveAccessAssert {}; 44 #endif 45 46 template <typename Adapter, typename AP, typename AccessAssert = ExclusiveAccessAssert> 47 class MemoryWriterHost : public StorageHost<Adapter, AP> { 48 debug_only(AccessAssert _access;) 49 public: 50 typedef typename Adapter::StorageType StorageType; 51 protected: 52 void bytes(void* dest, const void* buf, size_t len); 53 MemoryWriterHost(StorageType* storage, Thread* thread); 54 MemoryWriterHost(StorageType* storage, size_t size); 55 MemoryWriterHost(Thread* thread); 56 debug_only(bool is_acquired() const;) 57 public: 58 void acquire(); 59 void release(); 60 }; 61 62 template <typename Adapter, typename AP> 63 class AcquireReleaseMemoryWriterHost : public MemoryWriterHost<Adapter, AP> { 64 public: 65 typedef typename Adapter::StorageType StorageType; 66 AcquireReleaseMemoryWriterHost(StorageType* storage, Thread* thread); 67 AcquireReleaseMemoryWriterHost(StorageType* storage, size_t size); 68 AcquireReleaseMemoryWriterHost(Thread* thread); 69 ~AcquireReleaseMemoryWriterHost(); 70 }; 71 72 #endif // SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP