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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwindowspipewriter_p.h"
QT_BEGIN_NAMESPACE
#ifndef QT_NO_THREAD
QWindowsPipeWriter::QWindowsPipeWriter(HANDLE pipe, QObject * parent)
: QThread(parent),
writePipe(INVALID_HANDLE_VALUE),
quitNow(false),
hasWritten(false)
{
#if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)
DuplicateHandle(GetCurrentProcess(), pipe, GetCurrentProcess(),
&writePipe, 0, FALSE, DUPLICATE_SAME_ACCESS);
#else
Q_UNUSED(pipe);
writePipe = GetCurrentProcess();
#endif
}
QWindowsPipeWriter::~QWindowsPipeWriter()
{
lock.lock();
quitNow = true;
waitCondition.wakeOne();
lock.unlock();
if (!wait(100))
terminate();
#if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)
CloseHandle(writePipe);
#endif
}
bool QWindowsPipeWriter::waitForWrite(int msecs)
{
QMutexLocker locker(&lock);
bool hadWritten = hasWritten;
hasWritten = false;
if (hadWritten)
return true;
if (!waitCondition.wait(&lock, msecs))
return false;
hadWritten = hasWritten;
hasWritten = false;
return hadWritten;
}
qint64 QWindowsPipeWriter::write(const char *ptr, qint64 maxlen)
{
if (!isRunning())
return -1;
QMutexLocker locker(&lock);
data.append(QByteArray(ptr, maxlen));
waitCondition.wakeOne();
return maxlen;
}
void QWindowsPipeWriter::run()
{
OVERLAPPED overl = {0, 0, 0, 0, NULL};
overl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
forever {
lock.lock();
while(data.isEmpty() && (!quitNow)) {
waitCondition.wakeOne();
waitCondition.wait(&lock);
}
if (quitNow) {
lock.unlock();
quitNow = false;
break;
}
QByteArray copy = data;
lock.unlock();
const char *ptrData = copy.data();
qint64 maxlen = copy.size();
qint64 totalWritten = 0;
overl.Offset = 0;
overl.OffsetHigh = 0;
while ((!quitNow) && totalWritten < maxlen) {
DWORD written = 0;
// Write 2k at a time to prevent flooding the pipe. If you
// write too much (4k-8k), the pipe can close
// unexpectedly.
if (!WriteFile(writePipe, ptrData + totalWritten,
qMin<int>(2048, maxlen - totalWritten), &written, &overl)) {
if (GetLastError() == 0xE8/*NT_STATUS_INVALID_USER_BUFFER*/) {
// give the os a rest
msleep(100);
continue;
}
#ifndef Q_OS_WINCE
if (GetLastError() == ERROR_IO_PENDING) {
if (!GetOverlappedResult(writePipe, &overl, &written, TRUE)) {
CloseHandle(overl.hEvent);
return;
}
} else {
CloseHandle(overl.hEvent);
return;
}
#else
return;
#endif
}
totalWritten += written;
#if defined QPIPEWRITER_DEBUG
qDebug("QWindowsPipeWriter::run() wrote %d %d/%d bytes",
written, int(totalWritten), int(maxlen));
#endif
lock.lock();
data.remove(0, written);
hasWritten = true;
lock.unlock();
}
emit bytesWritten(totalWritten);
emit canWrite();
}
CloseHandle(overl.hEvent);
}
#endif //QT_NO_THREAD
QT_END_NAMESPACE
|
