1#!/usr/bin/env python
2
3
4#############################################################################
5##
6## Copyright (C) 2014 Riverbank Computing Limited.
7## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
8## All rights reserved.
9##
10## This file is part of the examples of PyQt.
11##
12## $QT_BEGIN_LICENSE:BSD$
13## You may use this file under the terms of the BSD license as follows:
14##
15## "Redistribution and use in source and binary forms, with or without
16## modification, are permitted provided that the following conditions are
17## met:
18##   * Redistributions of source code must retain the above copyright
19##     notice, this list of conditions and the following disclaimer.
20##   * Redistributions in binary form must reproduce the above copyright
21##     notice, this list of conditions and the following disclaimer in
22##     the documentation and/or other materials provided with the
23##     distribution.
24##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
25##     the names of its contributors may be used to endorse or promote
26##     products derived from this software without specific prior written
27##     permission.
28##
29## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
40## $QT_END_LICENSE$
41##
42#############################################################################
43
44
45import sys
46import random
47
48from PyQt5.QtCore import QCoreApplication, QSemaphore, QThread
49
50
51DataSize = 100000
52BufferSize = 8192
53buffer = list(range(BufferSize))
54
55freeBytes = QSemaphore(BufferSize)
56usedBytes = QSemaphore()
57
58
59class Producer(QThread):
60    def run(self):
61        for i in range(DataSize):
62            freeBytes.acquire()
63            buffer[i % BufferSize] = "ACGT"[random.randint(0, 3)]
64            usedBytes.release()
65
66
67class Consumer(QThread):
68    def run(self):
69        for i in range(DataSize):
70            usedBytes.acquire()
71            sys.stderr.write(buffer[i % BufferSize])
72            freeBytes.release()
73
74        sys.stderr.write("\n")
75
76
77if __name__ == '__main__':
78    app = QCoreApplication(sys.argv)
79    producer = Producer()
80    consumer = Consumer()
81    producer.start()
82    consumer.start()
83    producer.wait()
84    consumer.wait()
85