1 /* 2 * Copyright (c) 2000, 2015, 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 "classfile/stringTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/codeCache.hpp" 29 #include "gc_interface/collectedHeap.inline.hpp" 30 #include "memory/sharedHeap.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/atomic.inline.hpp" 33 #include "runtime/fprofiler.hpp" 34 #include "runtime/java.hpp" 35 #include "utilities/copy.hpp" 36 #include "utilities/workgroup.hpp" 37 38 SharedHeap* SharedHeap::_sh; 39 40 SharedHeap::SharedHeap() : 41 CollectedHeap(), 42 _workers(NULL) 43 { 44 _sh = this; // ch is static, should be set only once. 45 if (UseConcMarkSweepGC || UseG1GC) { 46 _workers = new FlexibleWorkGang("GC Thread", ParallelGCThreads, 47 /* are_GC_task_threads */true, 48 /* are_ConcurrentGC_threads */false); 49 if (_workers == NULL) { 50 vm_exit_during_initialization("Failed necessary allocation."); 51 } else { 52 _workers->initialize_workers(); 53 } 54 } 55 } 56 57 bool SharedHeap::heap_lock_held_for_gc() { 58 Thread* t = Thread::current(); 59 return Heap_lock->owned_by_self() 60 || ( (t->is_GC_task_thread() || t->is_VM_thread()) 61 && _thread_holds_heap_lock_for_gc); 62 } 63 64 void SharedHeap::set_par_threads(uint t) { 65 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); 66 _n_par_threads = t; 67 } 68 69 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate) 70 : MarkScope(activate), _sh(heap) 71 { 72 if (_active) { 73 Threads::change_thread_claim_parity(); 74 // Zero the claimed high water mark in the StringTable 75 StringTable::clear_parallel_claimed_index(); 76 } 77 } 78 79 SharedHeap::StrongRootsScope::~StrongRootsScope() { 80 Threads::assert_all_threads_claimed(); 81 } 82 83 void SharedHeap::set_barrier_set(BarrierSet* bs) { 84 _barrier_set = bs; 85 // Cached barrier set for fast access in oops 86 oopDesc::set_bs(bs); 87 } 88 89 void SharedHeap::post_initialize() { 90 CollectedHeap::post_initialize(); 91 ref_processing_init(); 92 } 93 94 void SharedHeap::ref_processing_init() {}