1 /* 2 * Copyright (c) 2017, 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 25 #ifndef SHARE_RUNTIME_THREADSMR_INLINE_HPP 26 #define SHARE_RUNTIME_THREADSMR_INLINE_HPP 27 28 #include "runtime/atomic.hpp" 29 #include "memory/iterator.hpp" 30 #include "runtime/prefetch.inline.hpp" 31 #include "runtime/thread.inline.hpp" 32 #include "runtime/threadSMR.hpp" 33 34 // Devirtualize known thread closure types. 35 template <class T> 36 inline void ThreadsList::threads_do_dispatch(T *cl, JavaThread *const thread) const { 37 cl->T::do_thread(thread); 38 } 39 40 template <> 41 inline void ThreadsList::threads_do_dispatch<ThreadClosure>(ThreadClosure *cl, JavaThread *const thread) const { 42 cl->do_thread(thread); 43 } 44 45 template <class T> 46 inline void ThreadsList::threads_do(T *cl) const { 47 const intx scan_interval = PrefetchScanIntervalInBytes; 48 JavaThread *const *const end = _threads + _length; 49 for (JavaThread *const *current_p = _threads; current_p != end; current_p++) { 50 Prefetch::read((void*)current_p, scan_interval); 51 JavaThread *const current = *current_p; 52 threads_do_dispatch(cl, current); 53 } 54 } 55 56 // These three inlines are private to ThreadsSMRSupport, but 57 // they are called by public inline update_tlh_stats() below: 58 59 inline void ThreadsSMRSupport::add_tlh_times(uint add_value) { 60 Atomic::add(&_tlh_times, add_value); 61 } 62 63 inline void ThreadsSMRSupport::inc_tlh_cnt() { 64 Atomic::inc(&_tlh_cnt); 65 } 66 67 inline void ThreadsSMRSupport::update_tlh_time_max(uint new_value) { 68 while (true) { 69 uint cur_value = _tlh_time_max; 70 if (new_value <= cur_value) { 71 // No need to update max value so we're done. 72 break; 73 } 74 if (Atomic::cmpxchg(&_tlh_time_max, cur_value, new_value) == cur_value) { 75 // Updated max value so we're done. Otherwise try it all again. 76 break; 77 } 78 } 79 } 80 81 inline ThreadsList* ThreadsSMRSupport::get_java_thread_list() { 82 return (ThreadsList*)Atomic::load_acquire(&_java_thread_list); 83 } 84 85 inline bool ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(JavaThread *thread, bool skiplock) { 86 MutexLocker ml(Threads_lock->owned_by_self() || skiplock ? NULL : Threads_lock); 87 return is_a_protected_JavaThread(thread); 88 } 89 90 inline void ThreadsSMRSupport::update_tlh_stats(uint millis) { 91 ThreadsSMRSupport::inc_tlh_cnt(); 92 ThreadsSMRSupport::add_tlh_times(millis); 93 ThreadsSMRSupport::update_tlh_time_max(millis); 94 } 95 96 #endif // SHARE_RUNTIME_THREADSMR_INLINE_HPP