1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. 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 #include "gc/shared/barrierSet.hpp"
27 #include "gc/shared/barrierSetAssembler.hpp"
28 #include "runtime/thread.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 BarrierSet* BarrierSet::_barrier_set = NULL;
33
set_barrier_set(BarrierSet * barrier_set)34 void BarrierSet::set_barrier_set(BarrierSet* barrier_set) {
35 assert(_barrier_set == NULL, "Already initialized");
36 _barrier_set = barrier_set;
37
38 // Notify barrier set of the current (main) thread. Normally the
39 // Thread constructor deals with this, but the main thread is
40 // created before we get here. Verify it isn't yet on the thread
41 // list, else we'd also need to call BarrierSet::on_thread_attach.
42 // This is the only thread that can exist at this point; the Thread
43 // constructor objects to other threads being created before the
44 // barrier set is available.
45 assert(Thread::current()->is_Java_thread(),
46 "Expected main thread to be a JavaThread");
47 assert(!JavaThread::current()->on_thread_list(),
48 "Main thread already on thread list.");
49 _barrier_set->on_thread_create(Thread::current());
50 }
51
52 // Called from init.cpp
gc_barrier_stubs_init()53 void gc_barrier_stubs_init() {
54 BarrierSet* bs = BarrierSet::barrier_set();
55 #ifndef ZERO
56 BarrierSetAssembler* bs_assembler = bs->barrier_set_assembler();
57 bs_assembler->barrier_stubs_init();
58 #endif
59 }
60