Problem with threads

[steubi]

Hi,

I am trying to create two threads using the pthread library.
Both threads have the same attributes and do the same thing (they are both listening to UDP port and waiting for messages).
The issue here is that one of the thread (the one created last) is a lot slower than the other. (when I send a message to the second thread it takes longer to process it than when I send it to the first one created).

Here are the attributes I use for the threads:

pthread_attr_init(&custom_attributes);
pthread_attr_setscope(&custom_attributes, PTHREAD_SCOPE_SYSTEM);
pthread_attr_setinheritsched(&custom_attributes, PTHREAD_EXPLICIT_SCHED);
pthread_attr_setschedpolicy(&custom_attributes, SCHED_RR);
rr_param.sched_priority = sched_get_priority_max(SCHED_RR);
pthread_attr_setschedparam(&custom_attributes,&rr_param);

Any idea of what I may do wrong?

Thanks

 

[Salem]

> Any idea of what I may do wrong?
If you send a message to thread 2, then immediately send a message to thread 1, is it equally unresponsive?

--

 

[steubi]

No,
What I have done is send messages to thread 1 and 2 in turn (the message rate being really slow). Thread 1 is always faster than thread 2. But sometimes both of them become even slower.