blob: 4582bcbbeba92a7ca0b63c77ebd128c389e225e4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* GStreamer
* Copyright (C) 2009 Andrey Nechypurenko <andreynech@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __ASYNCQUEUE_H
#define __ASYNCQUEUE_H
#include <QMutex>
#include <QWaitCondition>
#include <QList>
/**
* This is the thread safe implementation of the Queue. It can be
* used in classical producers/consumers multithreaded scenario. The
* template parameter is the class which can be put/get to/from the
* queue.
*/
template<class T>
class AsyncQueue
{
public:
AsyncQueue() : waitingReaders(0) {}
int size()
{
QMutexLocker locker(&mutex);
return this->buffer.size();
}
void put(const T& item)
{
QMutexLocker locker(&mutex);
this->buffer.push_back(item);
if(this->waitingReaders)
this->bufferIsNotEmpty.wakeOne();
}
T get()
{
QMutexLocker locker(&mutex);
while(this->buffer.size() == 0)
{
++(this->waitingReaders);
this->bufferIsNotEmpty.wait(&mutex);
--(this->waitingReaders);
}
T item = this->buffer.front();
this->buffer.pop_front();
return item;
}
private:
typedef QList<T> Container;
QMutex mutex;
QWaitCondition bufferIsNotEmpty;
Container buffer;
short waitingReaders;
};
#endif // __ASYNCQUEUE_H
|
