1 /* 2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP 26 27 #include "gc/shared/workgroup.hpp" 28 #include "gc/shenandoah/shenandoahTaskqueue.hpp" 29 #include "memory/allocation.hpp" 30 31 class ShenandoahObjToScanQueueSet; 32 33 class ShenandoahWorkerScope : public StackObj { 34 private: 35 uint _n_workers; 36 WorkGang* _workers; 37 public: 38 ShenandoahWorkerScope(WorkGang* workers, uint nworkers, const char* msg, bool do_check = true); 39 ~ShenandoahWorkerScope(); 40 }; 41 42 class ShenandoahPushWorkerScope : StackObj { 43 protected: 44 uint _n_workers; 45 uint _old_workers; 46 WorkGang* _workers; 47 48 public: 49 ShenandoahPushWorkerScope(WorkGang* workers, uint nworkers, bool do_check = true); 50 ~ShenandoahPushWorkerScope(); 51 }; 52 53 class ShenandoahPushWorkerQueuesScope : public ShenandoahPushWorkerScope { 54 private: 55 ShenandoahObjToScanQueueSet* _queues; 56 57 public: 58 ShenandoahPushWorkerQueuesScope(WorkGang* workers, ShenandoahObjToScanQueueSet* queues, uint nworkers, bool do_check = true); 59 ~ShenandoahPushWorkerQueuesScope(); 60 }; 61 62 class ShenandoahWorkGang : public WorkGang { 63 private: 64 bool _initialize_gclab; 65 public: ShenandoahWorkGang(const char * name,uint workers,bool are_GC_task_threads,bool are_ConcurrentGC_threads)66 ShenandoahWorkGang(const char* name, 67 uint workers, 68 bool are_GC_task_threads, 69 bool are_ConcurrentGC_threads) : 70 WorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads), _initialize_gclab(false) { 71 } 72 73 // Create a GC worker and install it into the work gang. 74 // We need to initialize gclab for dynamic allocated workers 75 AbstractGangWorker* install_worker(uint which); 76 77 // We allow _active_workers < _total_workers when UseDynamicNumberOfGCThreads is off. 78 // We use the same WorkGang for concurrent and parallel processing, and honor 79 // ConcGCThreads and ParallelGCThreads settings active_workers() const80 virtual uint active_workers() const { 81 assert(_active_workers > 0, "no active worker"); 82 assert(_active_workers <= _total_workers, 83 "_active_workers: %u > _total_workers: %u", _active_workers, _total_workers); 84 return _active_workers; 85 } 86 set_initialize_gclab()87 void set_initialize_gclab() { assert(!_initialize_gclab, "Can only enable once"); _initialize_gclab = true; } 88 }; 89 90 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP 91