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_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP
25#define SHARE_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP
26
27#include "gc/shared/workgroup.hpp"
28#include "gc/shenandoah/shenandoahTaskqueue.hpp"
29#include "memory/allocation.hpp"
30
31class ShenandoahObjToScanQueueSet;
32
33class ShenandoahWorkerScope : public StackObj {
34private:
35 uint _n_workers;
36 WorkGang* _workers;
37public:
38 ShenandoahWorkerScope(WorkGang* workers, uint nworkers, const char* msg, bool do_check = true);
39 ~ShenandoahWorkerScope();
40};
41
42class ShenandoahPushWorkerScope : StackObj {
43protected:
44 uint _n_workers;
45 uint _old_workers;
46 WorkGang* _workers;
47
48public:
49 ShenandoahPushWorkerScope(WorkGang* workers, uint nworkers, bool do_check = true);
50 ~ShenandoahPushWorkerScope();
51};
52
53class ShenandoahPushWorkerQueuesScope : public ShenandoahPushWorkerScope {
54private:
55 ShenandoahObjToScanQueueSet* _queues;
56
57public:
58 ShenandoahPushWorkerQueuesScope(WorkGang* workers, ShenandoahObjToScanQueueSet* queues, uint nworkers, bool do_check = true);
59 ~ShenandoahPushWorkerQueuesScope();
60};
61
62class ShenandoahWorkGang : public WorkGang {
63private:
64 bool _initialize_gclab;
65public:
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
80 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
87 void set_initialize_gclab() { assert(!_initialize_gclab, "Can only enable once"); _initialize_gclab = true; }
88};
89
90#endif // SHARE_GC_SHENANDOAH_SHENANDOAHWORKGROUP_HPP
91