Hi! I have some troubles understanding the scheduler source code. Maybe someone can give me some hints. Thx.
Task switching -------------- Task switching is done in rtl_schedule by calling rtl_switch_to(). The switch occurs when the "ret" instruction of rtl_switch_to() is carried out. At this point a new task runs. The remainder of rtl_schedule is postponed until the previous task is activated again. Right? If so I have problems with the floating point support. Why are the floating point registers saved and restored after the call to rtl_switch_to(). Isn't it to late to do this here, because the switch to the task has already occurred and been carried out? I also took a look at the RTAI source code and they do this before switch_to. rtl_switch_to difference between I386 and PPC --------------------------------------------- The I386 implementation of rtl_switch_to ends with a "ret" while the PPC implementation ends with "rfi". Why? The RTAI PPC code is similar but ends with "blr". -- Franz Hollerer Dependable Computer Systems Stumpergasse 48/28, A-1060 Wien, Austria Phone: +43 1 5953935-21 mailto:[EMAIL PROTECTED] Fax: +43 1 5953935-18 http://www.decomsys.com ------------------------------------------------------------------------ Austria Usually we don't have kangaroos. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] -- For more information on Real-Time Linux see: http://www.rtlinux.org/
