StackThreads/MP: version 0.77 User's Guide

3.9.3: Check Messages between Workers

        void ST_STEAL_REQ_CHECK();

requesting a thread migration from the calling worker. If it is, it gives an appropriate thread to the requesting worker. This is implicitly called by ST_POLLING(), so this should be usually of no interest for you. Use this API only when you understand how StackThreads/MP works and when you want to migrate threads without freeing stack frames.