Add a write buffer to QLocalSocket/Win

Commit 0307c008 removed the buffering of data-to-be-written from
QWindowsPipeWriter, because it was assumed that users of this class
(QProcess and QLocalSocket) already buffer data internally.

This assumption was wrong for QLocalSocket. The following sequence
    localSocket->write(someData);
    localSocket->write(someMoreData);
would not write anything on the second write.

Add a write buffer to the Windows implementation of QLocalSocket.

Task-number: QTBUG-52073
Change-Id: I6d0f03a722ec48138cbde3e2f69aae7dafe790d3
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/network/socket/qlocalsocket_p.h b/src/network/socket/qlocalsocket_p.h
index 46c93c01f7..a594605ae0 100644
--- a/src/network/socket/qlocalsocket_p.h
+++ b/src/network/socket/qlocalsocket_p.h
@@ -55,6 +55,7 @@
 #if defined(QT_LOCALSOCKET_TCP)
 #   include "qtcpsocket.h"
 #elif defined(Q_OS_WIN)
+#   include <private/qringbuffer_p.h>
 #   include "private/qwindowspipereader_p.h"
 #   include "private/qwindowspipewriter_p.h"
 #   include <qwineventnotifier.h>
@@ -123,10 +124,12 @@ public:
     ~QLocalSocketPrivate();
     void destroyPipeHandles();
     void setErrorString(const QString &function);
-    void _q_canWrite();
+    void startNextWrite();
+    void _q_bytesWritten(qint64 bytes);
     void _q_pipeClosed();
     void _q_winError(ulong windowsError, const QString &function);
     HANDLE handle;
+    QRingBuffer writeBuffer;
     QWindowsPipeWriter *pipeWriter;
     QWindowsPipeReader *pipeReader;
     QLocalSocket::LocalSocketError error;