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comparison Core/MultiThreading/Semaphore.cpp @ 995:8c67382f44a7 lua-scripting

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limit number of jobs in the scheduler
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 03 Jul 2014 15:58:53 +0200
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children 6e7e5ed91c2d
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994:b3d4f8a30324 995:8c67382f44a7
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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
33 #include "Semaphore.h"
34
35 #include "../OrthancException.h"
36
37
38 namespace Orthanc
39 {
40 Semaphore::Semaphore(unsigned int count) : count_(count)
41 {
42 if (count == 0)
43 {
44 throw OrthancException(ErrorCode_ParameterOutOfRange);
45 }
46 }
47
48 void Semaphore::Release()
49 {
50 boost::mutex::scoped_lock lock(mutex_);
51
52 count_++;
53 condition_.notify_one();
54 }
55
56 void Semaphore::Acquire()
57 {
58 boost::mutex::scoped_lock lock(mutex_);
59
60 while (count_ == 0)
61 {
62 condition_.wait(lock);
63 }
64
65 count_++;
66 }
67 }