1 /*
2 * Copyright (c) 2014, 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_implementation/shared/suspendibleThreadSet.hpp"
27 #include "runtime/mutexLocker.hpp"
28 #include "runtime/thread.inline.hpp"
29
30 uint SuspendibleThreadSet::_nthreads = 0;
31 uint SuspendibleThreadSet::_nthreads_stopped = 0;
32 bool SuspendibleThreadSet::_suspend_all = false;
33 double SuspendibleThreadSet::_suspend_all_start = 0.0;
34
35 void SuspendibleThreadSet::join() {
36 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
37 while (_suspend_all) {
38 ml.wait(Mutex::_no_safepoint_check_flag);
39 }
40 _nthreads++;
41 }
42
43 void SuspendibleThreadSet::leave() {
44 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
45 assert(_nthreads > 0, "Invalid");
46 _nthreads--;
47 if (_suspend_all) {
48 ml.notify_all();
49 }
50 }
51
52 void SuspendibleThreadSet::yield() {
53 if (_suspend_all) {
54 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
55 if (_suspend_all) {
56 _nthreads_stopped++;
57 if (_nthreads_stopped == _nthreads) {
58 if (ConcGCYieldTimeout > 0) {
59 double now = os::elapsedTime();
60 guarantee((now - _suspend_all_start) * 1000.0 < (double)ConcGCYieldTimeout, "Long delay");
61 }
62 }
63 ml.notify_all();
64 while (_suspend_all) {
65 ml.wait(Mutex::_no_safepoint_check_flag);
66 }
67 assert(_nthreads_stopped > 0, "Invalid");
68 _nthreads_stopped--;
69 ml.notify_all();
70 }
71 }
72 }
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1 /*
2 * Copyright (c) 2014, 2015, 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_implementation/shared/suspendibleThreadSet.hpp"
27 #include "runtime/mutexLocker.hpp"
28 #include "runtime/thread.inline.hpp"
29
30 uint SuspendibleThreadSet::_nthreads = 0;
31 uint SuspendibleThreadSet::_nthreads_stopped = 0;
32 bool SuspendibleThreadSet::_suspend_all = false;
33 double SuspendibleThreadSet::_suspend_all_start = 0.0;
34
35 void SuspendibleThreadSet::join() {
36 assert(Thread::current()->is_suspendible_thread() == false,
37 "Thread already joined");
38 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
39 while (_suspend_all) {
40 ml.wait(Mutex::_no_safepoint_check_flag);
41 }
42 _nthreads++;
43 #ifdef ASSERT
44 Thread::current()->set_suspendible_thread();
45 #endif
46 }
47
48 void SuspendibleThreadSet::leave() {
49 assert(Thread::current()->is_suspendible_thread(),
50 "Thread not joined");
51 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
52 assert(_nthreads > 0, "Invalid");
53 #ifdef ASSERT
54 Thread::current()->clear_suspendible_thread();
55 #endif
56 _nthreads--;
57 if (_suspend_all) {
58 ml.notify_all();
59 }
60 }
61
62 void SuspendibleThreadSet::yield() {
63 assert(Thread::current()->is_suspendible_thread(), "Must have joined");
64 if (_suspend_all) {
65 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
66 if (_suspend_all) {
67 _nthreads_stopped++;
68 if (_nthreads_stopped == _nthreads) {
69 if (ConcGCYieldTimeout > 0) {
70 double now = os::elapsedTime();
71 guarantee((now - _suspend_all_start) * 1000.0 < (double)ConcGCYieldTimeout, "Long delay");
72 }
73 }
74 ml.notify_all();
75 while (_suspend_all) {
76 ml.wait(Mutex::_no_safepoint_check_flag);
77 }
78 assert(_nthreads_stopped > 0, "Invalid");
79 _nthreads_stopped--;
80 ml.notify_all();
81 }
82 }
83 }
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