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_SHENANDOAH_WORKGROUP_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAH_WORKGROUP_HPP 26 27 #include "gc_implementation/shenandoah/shenandoahTaskqueue.hpp" 28 #include "utilities/workgroup.hpp" 29 #include "memory/allocation.hpp" 30 31 class ShenandoahWorkGang; 32 33 class ShenandoahWorkerScope : public StackObj { 34 private: 35 uint _n_workers; 36 ShenandoahWorkGang* _workers; 37 public: 38 ShenandoahWorkerScope(ShenandoahWorkGang* workers, uint nworkers, const char* msg, bool do_check = true); 39 ~ShenandoahWorkerScope(); 40 }; 41 42 class ShenandoahPushWorkerScope : StackObj { 43 private: 44 uint _n_workers; 45 uint _old_workers; 46 ShenandoahWorkGang* _workers; 47 48 public: 49 ShenandoahPushWorkerScope(ShenandoahWorkGang* workers, uint nworkers, bool do_check = true); 50 ~ShenandoahPushWorkerScope(); 51 }; 52 53 class ShenandoahWorkGang : public FlexibleWorkGang { 54 public: 55 ShenandoahWorkGang(const char* name, uint workers, 56 bool are_GC_task_threads, 57 bool are_ConcurrentGC_threads) : 58 FlexibleWorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads) { 59 } 60 61 // Hide FlexibleWorkGang's implementation, avoid _active_workers == _total_workers 62 // check 63 void set_active_workers(uint v) { 64 assert(v <= _total_workers, 65 "Trying to set more workers active than there are"); 66 _active_workers = MIN2(v, _total_workers); 67 assert(v != 0, "Trying to set active workers to 0"); 68 _active_workers = MAX2(1U, _active_workers); 69 } 70 }; 71 72 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP