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cxSharedMemory.h
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1 /*=========================================================================
2 This file is part of CustusX, an Image Guided Therapy Application.
3 
4 Copyright (c) 2008-2014, SINTEF Department of Medical Technology
5 All rights reserved.
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7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
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10 1. Redistributions of source code must retain the above copyright notice,
11  this list of conditions and the following disclaimer.
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13 2. Redistributions in binary form must reproduce the above copyright notice,
14  this list of conditions and the following disclaimer in the documentation
15  and/or other materials provided with the distribution.
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17 3. Neither the name of the copyright holder nor the names of its contributors
18  may be used to endorse or promote products derived from this software
19  without specific prior written permission.
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21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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25 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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31 =========================================================================*/
32 
33 #ifndef CXSHAREDMEMORY_H_
34 #define CXSHAREDMEMORY_H_
35 
36 #include "cxResourceExport.h"
37 
38 #include <QSharedMemory>
39 #include <QDateTime>
40 
41 namespace cx
42 {
43 
49 
61 class cxResource_EXPORT SharedMemoryServer
62 {
63 private:
64  QSharedMemory mBuffer;
65  int mSize;
66  int mBuffers;
67  int mCurrentBuffer;
68  QDateTime mLastTimestamp;
69 
70 public:
80  SharedMemoryServer(QString key, int buffers, int sizeEach, QObject *parent = 0);
82  int size() { return mSize; }
83  int buffers() { return mBuffers; }
84  QString key() { return mBuffer.key(); }
85  void *buffer();
86  void release();
87 
90  QDateTime lastTimestamp() { return mLastTimestamp; }
94  bool hasBuffer() { return mCurrentBuffer != -1; }
95 private:
96  void internalRelease(bool lock);
97 };
98 
105 class cxResource_EXPORT SharedMemoryClient
106 {
107 private:
108  QSharedMemory mBuffer;
109  int mSize;
110  int mBuffers;
111  int mCurrentBuffer;
112  QDateTime mTimestamp;
113 
114 public:
115  SharedMemoryClient(QObject *parent = 0);
117  bool attach(const QString &key);
118  bool detach();
119  int size() { return mSize; }
120  int buffers() { return mBuffers; }
121  QString key() { return mBuffer.key(); }
122  const void *buffer(bool onlyNew=false);
123  void release();
124  const void *isNew();
125  QDateTime timestamp() { return mTimestamp; }
126 };
127 
128 }
129 
130 #endif
Shared Memory Server.
Shared Memory Client.