Thanks for the reply. What I understand now is that while the poll for reading was done away with, the poll for writing still remains. I have created a bugreport at https://bugreports.qt.io/browse/QTBUG-45457 . Hopefully I have explained the problem correctly there.
On Wed, Apr 8, 2015 at 4:18 PM, Joerg Bornemann < [email protected]> wrote: > On 08-Apr-15 09:21, Shantanu Tushar wrote: > > > Lets say I launch an external application on Windows using this code- > [...polling in QProcess...] > > This polling code is there for historical reasons. It's a naive way to > simulate a socket notifier for stdin. If there's no data to write the > _q_notified call doesn't do much. > > > Right now I hack around this by doing this- > > > > QThread t; > > QProcess p; > > p.moveToThread(&t); > > p.start("C:\\Windows\\notepad.exe"); > > > > which basically causes the hasEventDispatcher() if condition to false > > and no polling happens. However, this generates warnings because the > > QProcess attempts to generate children. Further, I lose the ability to > > read stdout from the process. > > That's a bad way to avoid the polling for reasons you already mentioned. > > > Is there a cleaner way to disable the polling? Or at least make it less > > frequent? Just in case you're wondering, this is important because our > > users are freaks about CPU utilization and they don't want to see >0% > > CPU usage when the app is idle from their perspective. > > There's currently no way to disable the polling without changing Qt. > You can change the NOTIFYTIMEOUT define to a higher number and rebuild > Qt to make the polling less frequent. > You might want to create a bug report with a justification why this > issue is bad for you (apart from the fact that the current solution is > inelegant). > > > BR, > > Joerg > _______________________________________________ > Interest mailing list > [email protected] > http://lists.qt-project.org/mailman/listinfo/interest > -- Shantanu Tushar (UTC +0530) shantanu.io
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