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comparison src/share/vm/gc_implementation/shared/suspendibleThreadSet.cpp @ 20192:581e70386ec9

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8039147: Cleanup SuspendibleThreadSet Reviewed-by: brutisso, tschatzl, mgerdin
author pliden
date Fri, 11 Apr 2014 12:29:24 +0200
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20191:fd81a5764900 20192:581e70386ec9
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 }
73
74 void SuspendibleThreadSet::synchronize() {
75 assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
76 if (ConcGCYieldTimeout > 0) {
77 _suspend_all_start = os::elapsedTime();
78 }
79 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
80 assert(!_suspend_all, "Only one at a time");
81 _suspend_all = true;
82 while (_nthreads_stopped < _nthreads) {
83 ml.wait(Mutex::_no_safepoint_check_flag);
84 }
85 }
86
87 void SuspendibleThreadSet::desynchronize() {
88 assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
89 MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
90 assert(_nthreads_stopped == _nthreads, "Invalid");
91 _suspend_all = false;
92 ml.notify_all();
93 }