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