Wikipedia
ThreadWeaver
ThreadWeaver is system library in KDE Frameworks 5 and KDE Software Compilation 4. and incorporated into KDE Frameworks. ThreadWeaver allows developers to easily take advantage of multi-core processors and multithreading. In ThreadWeaver the workload is divided into individual jobs, then relationship between jobs (what order they should be completed or which has a higher priority); from that ThreadWeaver will work out the most efficient way to execute them. Krita has implemented visual filter previews using ThreadWeaver to prevent GUI lockups.