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According to here http://doc-snapshot.qt-project.org/4.8/qiodevice.html
Certain subclasses of QIODevice, such as QTcpSocket and QProcess, are asynchronous.
For example, the first write call has been made to send a chunk of data. Now before the first write call finishes, a second write call has also been made to send another chunk of data.
What happens now? Does the second call waits for the first call to completely finish before starting to send the chunks?
The data is buffered at least by the system TCP stack, so each call to
write“just” appends the new chunk to the unwritten data waiting to be sent.But if you call
writefrom 2 unsynchronized threads, the result is undefined.