1 /*
 2  * Copyright (c) 2017, 2021, Red Hat, Inc. All rights reserved.
 3  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  *
24  */
25 
26 #include "precompiled.hpp"
27 
28 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
30 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
31 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
32 
33 #include "logging/log.hpp"
34 #include "runtime/threads.hpp"
35 
36 ShenandoahWorkerScope::ShenandoahWorkerScope(WorkerThreads* workers, uint nworkers, const char* msg, bool check) :
37   _workers(workers) {
38   assert(msg != nullptr, "Missing message");
39 
40   _n_workers = _workers->set_active_workers(nworkers);
41   assert(_n_workers <= nworkers, "Must be");
42 
43   log_info(gc, task)("Using %u of %u workers for %s",
44     _n_workers, ShenandoahHeap::heap()->max_workers(), msg);
45 
46   if (check) {
47     ShenandoahHeap::heap()->assert_gc_workers(_n_workers);
48   }
49 }
50 
51 ShenandoahWorkerScope::~ShenandoahWorkerScope() {
52   assert(_workers->active_workers() == _n_workers,
53     "Active workers can not be changed within this scope");
54 }
55 
56 ShenandoahPushWorkerScope::ShenandoahPushWorkerScope(WorkerThreads* workers, uint nworkers, bool check) :
57   _old_workers(workers->active_workers()),
58   _workers(workers) {
59   _n_workers = _workers->set_active_workers(nworkers);
60   assert(_n_workers <= nworkers, "Must be");
61 
62   // bypass concurrent/parallel protocol check for non-regular paths, e.g. verifier, etc.
63   if (check) {
64     ShenandoahHeap::heap()->assert_gc_workers(_n_workers);
65   }
66 }
67 
68 ShenandoahPushWorkerScope::~ShenandoahPushWorkerScope() {
69   assert(_workers->active_workers() == _n_workers,
70     "Active workers can not be changed within this scope");
71   // Restore old worker value
72   uint nworkers = _workers->set_active_workers(_old_workers);
73   assert(nworkers == _old_workers, "Must be able to restore");
74 }
75 
76 void ShenandoahWorkerThreads::on_create_worker(WorkerThread* worker) {
77   if (_initialize_gclab) {
78     ShenandoahThreadLocalData::initialize_gclab(worker);
79   }
80 }