Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/shared/suspendibleThreadSet.cpp @ 20192:581e70386ec9
8039147: Cleanup SuspendibleThreadSet
Reviewed-by: brutisso, tschatzl, mgerdin
author | pliden |
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date | Fri, 11 Apr 2014 12:29:24 +0200 |
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20191:fd81a5764900 | 20192:581e70386ec9 |
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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 } |