Mercurial > hg > orthanc
annotate Core/MultiThreading/SharedMessageQueue.cpp @ 995:8c67382f44a7 lua-scripting
limit number of jobs in the scheduler
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 03 Jul 2014 15:58:53 +0200 |
parents | a811bdf8b8eb |
children | 7266c37d0354 |
rev | line source |
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450 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
689 | 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
450 | 4 * Belgium |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
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33 #include "../PrecompiledHeaders.h" |
450 | 34 #include "SharedMessageQueue.h" |
35 | |
36 namespace Orthanc | |
37 { | |
38 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) | |
39 { | |
40 maxSize_ = maxSize; | |
41 } | |
42 | |
43 | |
44 SharedMessageQueue::~SharedMessageQueue() | |
45 { | |
656 | 46 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it) |
450 | 47 { |
48 delete *it; | |
49 } | |
50 } | |
51 | |
52 | |
53 void SharedMessageQueue::Enqueue(IDynamicObject* message) | |
54 { | |
55 boost::mutex::scoped_lock lock(mutex_); | |
56 | |
57 if (maxSize_ != 0 && queue_.size() > maxSize_) | |
58 { | |
59 // Too many elements in the queue: First remove the oldest | |
60 delete queue_.front(); | |
61 queue_.pop_front(); | |
62 } | |
63 | |
64 queue_.push_back(message); | |
65 elementAvailable_.notify_one(); | |
66 } | |
67 | |
68 | |
69 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout) | |
70 { | |
71 boost::mutex::scoped_lock lock(mutex_); | |
72 | |
73 // Wait for a message to arrive in the FIFO queue | |
74 while (queue_.empty()) | |
75 { | |
76 if (millisecondsTimeout == 0) | |
77 { | |
78 elementAvailable_.wait(lock); | |
79 } | |
80 else | |
81 { | |
82 bool success = elementAvailable_.timed_wait | |
83 (lock, boost::posix_time::milliseconds(millisecondsTimeout)); | |
84 if (!success) | |
85 { | |
86 return NULL; | |
87 } | |
88 } | |
89 } | |
90 | |
91 std::auto_ptr<IDynamicObject> message(queue_.front()); | |
92 queue_.pop_front(); | |
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changeset
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93 |
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94 if (queue_.empty()) |
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95 { |
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96 emptied_.notify_all(); |
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97 } |
450 | 98 |
99 return message.release(); | |
100 } | |
452 | 101 |
102 | |
103 | |
104 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout) | |
105 { | |
106 boost::mutex::scoped_lock lock(mutex_); | |
107 | |
108 // Wait for the queue to become empty | |
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changeset
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109 while (!queue_.empty()) |
452 | 110 { |
111 if (millisecondsTimeout == 0) | |
112 { | |
113 emptied_.wait(lock); | |
114 } | |
115 else | |
116 { | |
117 if (!emptied_.timed_wait | |
118 (lock, boost::posix_time::milliseconds(millisecondsTimeout))) | |
119 { | |
120 return false; | |
121 } | |
122 } | |
123 } | |
124 | |
125 return true; | |
126 } | |
450 | 127 } |