Subj : pthread_attr_setschedparam problem on Linux Redhat AS 4.0.
To   : comp.programming.threads
From : tavoidoi@gmail.com
Date : Wed Aug 31 2005 12:20 pm

Hi,

I call this function to set priority of my thread.
   pthread_attr_setschedparam(&th->tcb, &params);

However, on Linux RedHat AS 4.0, the function
pthread_attr_setschedparam() somehow writes to two fields of th->tcb
structure, "sched_priority" and "detachstate". I see this while
debuging with ddd. The field "detachstate" gets the value that is
supposed to go to "sched_priority". and the "sched_priority" gets a
different value.
The "screwed-up" value of "detachstate" causes pthread_create() (called
later) to fail.

If I changed the line above to
   th->tcb.__schedparam.sched_priority = params.sched_priority;
then pthread_create() returns Ok.

I did not have this problem with Redhat AS 3.0.
Did anyone see the same thing? Is that a RedHat AS 4.0 problem, or my
problem?

thanks a lot,
-Thai Nguyen

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