somshekar kadam wrote: > Hi, > > I was understanding the context switch code of > Xenomai-2.3.0 for PPC, I got the point that once it > enters rthal_thread_switch , xnarch_thread_trampoline > function is executed, register 15 holds this address > of this function and register 2 holds the > rthal_thread_trampoline function, > what I am not able to understand is how does > rthal_thread_switch function is called,
rthal_thread_switch is called by xnarch_switch_to, which, in turn is called when the scheduler decides that the task (the newly created one, in this case) shoudl run. > > I understand from rthal_thread_trampoline > xnarch_thread_trampoline is called by jumping to > function using mtlr and in link register has the > address of xnarch_thread_trampoline stored in reg 15 > and uses blr to jump to it and executes new thread. > > what I dont understand is how it excutes > rthal_thread_trampoline, may be some pointers on this, xnarch_init_thread prepares the stack and registers of the newly created task so that rthal_thread_switch does the right thing. Perhaps Philippe or Wolfgang will be able to give more details. -- Gilles Chanteperdrix. _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core