Subj : Thread priority and policy
To   : comp.programming.threads
From : hemarangarajan
Date : Fri Mar 18 2005 04:06 am

Hai,

i am basically porting a application fro solaris to thread,
there are 3 threads (POSIX)
thread A is bounded thread
thread b and  c are detached thread ,rest all are default parameters.(
i guess the scheduling policy will be SCHED_OTHER with the default
priority of 0)

while processing i make the thread A as a RealTime thread by changing
it class to SCHED_RR(shuld i go for SCHED_FIFO or SCHED_RR??)
and i need to reduce the thread priority for thread b by 1 less than
the default priority and for thread C one more than the defaulrt
priority.
in solaris i can use thr_setprio to change the priority
but in LINUX,when i try to change the priority(and not the scheduling
class) using pthread_setschedparam.i cannot because they are
SCHED_OTHER and only priority 0 is allowed for these class of thread.
should i make these threads as A RT thread?? if so why?

and what is the main difference between SCHED_FIFO and sched_RR

.