1 /* 2 * Copyright (c) 1997, 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 #include "precompiled.hpp" 26 #include "gc/shared/barrierSet.hpp" 27 #include "gc/shared/barrierSetAssembler.hpp" 28 #include "runtime/thread.hpp" 29 #include "utilities/macros.hpp" 30 31 BarrierSet* BarrierSet::_barrier_set = NULL; 32 33 class SetBarrierSetNonJavaThread : public ThreadClosure { 34 BarrierSet* _barrier_set; 35 size_t _count; 36 37 public: 38 SetBarrierSetNonJavaThread(BarrierSet* barrier_set) : 39 _barrier_set(barrier_set), _count(0) {} 40 41 virtual void do_thread(Thread* thread) { 42 _barrier_set->on_thread_create(thread); 43 ++_count; 44 } 45 46 size_t count() const { return _count; } 47 }; 48 49 void BarrierSet::set_barrier_set(BarrierSet* barrier_set) { 50 assert(_barrier_set == NULL, "Already initialized"); 51 _barrier_set = barrier_set; 52 53 // Some threads are created before the barrier set, so the call to 54 // BarrierSet::on_thread_create had to be deferred for them. Now that 55 // we have the barrier set, do those deferred calls. 56 57 // First do any non-JavaThreads. 58 SetBarrierSetNonJavaThread njt_closure(_barrier_set); 59 Threads::non_java_threads_do(&njt_closure); 60 61 // Do the current (main) thread. Ensure it's the one and only 62 // JavaThread so far. Also verify that it isn't yet on the thread 63 // list, else we'd also need to call BarrierSet::on_thread_attach. 64 assert(Thread::current()->is_Java_thread(), 65 "Expected main thread to be a JavaThread"); 66 assert((njt_closure.count() + 1) == Threads::threads_before_barrier_set(), 67 "Unexpected JavaThreads before barrier set initialization: " 68 "Non-JavaThreads: " SIZE_FORMAT ", all: " SIZE_FORMAT, 69 njt_closure.count(), Threads::threads_before_barrier_set()); 70 assert(!JavaThread::current()->on_thread_list(), 71 "Main thread already on thread list."); 72 _barrier_set->on_thread_create(Thread::current()); 73 } 74 75 // Called from init.cpp 76 void gc_barrier_stubs_init() { 77 BarrierSet* bs = BarrierSet::barrier_set(); 78 #ifndef ZERO 79 BarrierSetAssembler* bs_assembler = bs->barrier_set_assembler(); 80 bs_assembler->barrier_stubs_init(); 81 #endif 82 }