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  1. Qt
  2. QTBUG-14975

waitForReadyRead used with a QTcpSocket may timeout even if data is coming

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • None
    • 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.8.5, 5.4.2, 5.5.1
    • Network
    • Windows 7, Window 8.1 64 bit

    Description

      waitForReadyRead is used to wait more data in a thread (see below). Sometimes (approximately each 4-5 GB transmitted) it will block even data is coming.

      // [..]
forever
{
   bytesRead = socket->read(buffer, 512 * 1024);

   if (bytesRead == 0)
   {
      if (!socket->waitForReadyRead(10000))
      {
         QCoreApplication::processEvents();
         print(socket->bytesAvailable()) // Will always print "8192"!!
         break;
      }
      continue;
   }
   else if (bytesRead == -1)
   {
      break;
   }
   // Data read are used here
}
// [..]

      It will timeout but still says there is some bytes available!

      Attachments

        Issue Links

          is replaced by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-24451 windows - QAbstractSocket::waitForXXX functions are unreliable

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-24451 windows - QAbstractSocket::waitForXXX functions are unreliable

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open
          For Gerrit Dashboard: QTBUG-14975
          # Subject Branch Project Status CR V
          115228,2 QNativeSocketEnginePrivate::nativeSelect - timeouts on Windows dev qt/qtbase Status: DEFERRED 0 0

          Activity

            People

              tpochep Timur Pocheptsov
              gburri Greg Burri
              Votes:
              22 Vote for this issue
              Watchers:
              24 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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