1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the QtCore module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "qwindowspipewriter_p.h"

    43 

    44 QT_BEGIN_NAMESPACE

    45 

    46 #ifndef QT_NO_THREAD

    47 

    48 QWindowsPipeWriter::QWindowsPipeWriter(HANDLE pipe, QObject * parent)

    49     : QThread(parent),

    50       writePipe(INVALID_HANDLE_VALUE),

    51       quitNow(false),

    52       hasWritten(false)

    53 {

    54 #if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)

    55     DuplicateHandle(GetCurrentProcess(), pipe, GetCurrentProcess(),

    56                          &writePipe, 0, FALSE, DUPLICATE_SAME_ACCESS);

    57 #else

    58     Q_UNUSED(pipe);

    59     writePipe = GetCurrentProcess();

    60 #endif

    61 }

    62 

    63 QWindowsPipeWriter::~QWindowsPipeWriter()

    64 {

    65     lock.lock();

    66     quitNow = true;

    67     waitCondition.wakeOne();

    68     lock.unlock();

    69     if (!wait(100))

    70         terminate();

    71 #if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)

    72     CloseHandle(writePipe);

    73 #endif

    74 }

    75 

    76 bool QWindowsPipeWriter::waitForWrite(int msecs)

    77 {

    78     QMutexLocker locker(&lock);

    79     bool hadWritten = hasWritten;

    80     hasWritten = false;

    81     if (hadWritten)

    82         return true;

    83     if (!waitCondition.wait(&lock, msecs))

    84         return false;

    85     hadWritten = hasWritten;

    86     hasWritten = false;

    87     return hadWritten;

    88 }

    89 

    90 qint64 QWindowsPipeWriter::write(const char *ptr, qint64 maxlen)

    91 {

    92     if (!isRunning())

    93         return -1;

    94 

    95     QMutexLocker locker(&lock);

    96     data.append(QByteArray(ptr, maxlen));

    97     waitCondition.wakeOne();

    98     return maxlen;

    99 }

   100 

   101 void QWindowsPipeWriter::run()

   102 {

   103     OVERLAPPED overl = {0, 0, 0, 0, NULL};

   104     overl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

   105     forever {

   106         lock.lock();

   107         while(data.isEmpty() && (!quitNow)) {

   108             waitCondition.wakeOne();

   109             waitCondition.wait(&lock);

   110         }

   111 

   112         if (quitNow) {

   113             lock.unlock();

   114             quitNow = false;

   115 	    break;

   116         }

   117 

   118         QByteArray copy = data;

   119 

   120         lock.unlock();

   121 

   122         const char *ptrData = copy.data();

   123         qint64 maxlen = copy.size();

   124         qint64 totalWritten = 0;

   125         overl.Offset = 0;

   126         overl.OffsetHigh = 0;

   127         while ((!quitNow) && totalWritten < maxlen) {

   128             DWORD written = 0;

   129             // Write 2k at a time to prevent flooding the pipe. If you

   130             // write too much (4k-8k), the pipe can close

   131             // unexpectedly.

   132             if (!WriteFile(writePipe, ptrData + totalWritten,

   133                     qMin<int>(2048, maxlen - totalWritten), &written, &overl)) {

   134                 if (GetLastError() == 0xE8/*NT_STATUS_INVALID_USER_BUFFER*/) {

   135                     // give the os a rest

   136                     msleep(100);

   137                     continue;

   138                 }

   139 #ifndef Q_OS_WINCE

   140                 if (GetLastError() == ERROR_IO_PENDING) {

   141                   if (!GetOverlappedResult(writePipe, &overl, &written, TRUE)) {

   142                       CloseHandle(overl.hEvent);

   143                       return;

   144                   }

   145                 } else {

   146                     CloseHandle(overl.hEvent);

   147                     return;

   148                 }

   149 #else

   150                 return;

   151 #endif

   152             }

   153             totalWritten += written;

   154 #if defined QPIPEWRITER_DEBUG

   155             qDebug("QWindowsPipeWriter::run() wrote %d %d/%d bytes",

   156 			    written, int(totalWritten), int(maxlen));

   157 #endif

   158             lock.lock();

   159             data.remove(0, written);

   160             hasWritten = true;

   161             lock.unlock();

   162         }

   163         emit bytesWritten(totalWritten);

   164         emit canWrite();

   165     }

   166     CloseHandle(overl.hEvent);

   167 }

   168 

   169 #endif //QT_NO_THREAD

   170 

   171 QT_END_NAMESPACE