1 /* 2 * Copyright (c) 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_UTILITIES_GLOBAL_COUNTER_INLINE_HPP 26 #define SHARE_UTILITIES_GLOBAL_COUNTER_INLINE_HPP 27 28 #include "runtime/orderAccess.inline.hpp" 29 #include "runtime/thread.inline.hpp" 30 #include "utilities/globalCounter.hpp" 31 32 inline void GlobalCounter::critical_section_begin(Thread *thread) { 33 assert(thread == Thread::current(), "must be current thread"); 34 assert(thread->is_VM_thread() || thread->is_Java_thread(), "must be VMThread or JavaThread"); 35 assert((*thread->get_rcu_counter() & COUNTER_ACTIVE) == 0x0, "nestled critical sections, not supported yet"); 36 uintx gbl_cnt = OrderAccess::load_acquire(&_global_counter._counter); 37 OrderAccess::release_store_fence(thread->get_rcu_counter(), gbl_cnt | COUNTER_ACTIVE); 38 } 39 40 inline void GlobalCounter::critical_section_end(Thread *thread) { 41 assert(thread == Thread::current(), "must be current thread"); 42 assert(thread->is_VM_thread() || thread->is_Java_thread(), "must be VMThread or JavaThread"); 43 assert((*thread->get_rcu_counter() & COUNTER_ACTIVE) == COUNTER_ACTIVE, "must be in ctitical section"); 44 // Mainly for debugging we set it to 'now'. 45 uintx gbl_cnt = OrderAccess::load_acquire(&_global_counter._counter); 46 OrderAccess::release_store(thread->get_rcu_counter(), gbl_cnt); 47 } 48 49 class GlobalCounter::CriticalSection { 50 private: 51 Thread* _thread; 52 public: 53 inline CriticalSection(Thread* thread) : _thread(thread) { 54 GlobalCounter::critical_section_begin(_thread); 55 } 56 inline ~CriticalSection() { 57 GlobalCounter::critical_section_end(_thread); 58 } 59 }; 60 61 #endif // include guard