1 /* 2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. 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_SHENANDOAH_WORKGROUP_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAH_WORKGROUP_HPP 26 27 #include "gc/shared/workgroup.hpp" 28 #include "memory/allocation.hpp" 29 30 31 class ShenandoahWorkerScope : public StackObj { 32 private: 33 uint _n_workers; 34 WorkGang* _workers; 35 public: 36 ShenandoahWorkerScope(WorkGang* workers, uint nworkers); 37 ~ShenandoahWorkerScope(); 38 }; 39 40 41 class ShenandoahPushWorkerScope : StackObj { 42 private: 43 uint _n_workers; 44 uint _old_workers; 45 WorkGang* _workers; 46 47 public: 48 ShenandoahPushWorkerScope(WorkGang* workers, uint nworkers); 49 ~ShenandoahPushWorkerScope(); 50 }; 51 52 class ShenandoahWorkGang : public WorkGang { 53 private: 54 bool _initialize_gclab; 55 public: 56 ShenandoahWorkGang(const char* name, 57 uint workers, 58 bool are_GC_task_threads, 59 bool are_ConcurrentGC_threads) : 60 WorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads), _initialize_gclab(false) { 61 } 62 63 // Create a GC worker and install it into the work gang. 64 // We need to initialize gclab for dynamic allocated workers 65 AbstractGangWorker* install_worker(uint which); 66 67 // We allow _active_workers < _total_workers when UseDynamicNumberOfGCThreads is off. 68 // We use the same WorkGang for concurrent and parallel processing, and honor 69 // ConcGCThreads and ParallelGCThreads settings 70 virtual uint active_workers() const { 71 assert(_active_workers > 0, "no active worker"); 72 assert(_active_workers <= _total_workers, 73 "_active_workers: %u > _total_workers: %u", _active_workers, _total_workers); 74 return _active_workers; 75 } 76 77 void set_initialize_gclab() { assert(!_initialize_gclab, "Can only enable once"); _initialize_gclab = true; } 78 }; 79 80 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAH_WORKGROUP_HPP