Hi,
It really depends on what you want to do in the other thread, and how you've structured your program.
I recommend you start by reading "Multithreading Technologies in Qt":http://doc-snapshot.qt-project.org/qt5-release/threads-technologies.html -- it compares all the different ways to use threads in Qt.
If your program can use the map/filter/reduce pattern, Qt Concurrent provides pause/resume functionality.
[quote author="Jeroi" date="1400188871"]Since I don't seem to find proper knowledge either on google or in IRC[/quote]Did you check Qt's official documentation?
http://qt-project.org/doc/qt-5/qtconcurrent.html
http://qt-project.org/doc/qt-5/examples-threadandconcurrent.html