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