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Old 05-12-2004, 02:38 PM   #1
godOfThunder
LQ Newbie
 
Registered: Oct 2003
Location: Los Angeles, CA
Distribution: Fedora Core 2
Posts: 5

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LinuxThreads won't schedule real-time


Has anyone been able to get pthreads in Linux to run real-time? I've tried creating a new thread like so:

Code:
  pthread_t      real;
  pthread_attr_t realAttributes;
  sched_param    fifoLevel;
  fifoLevel.sched_priority = (sched_get_priority_max(SCHED_FIFO) +
                              sched_get_priority_min(SCHED_FIFO)) / 2;
                                                                                
  pthread_attr_init(&realAttributes);
  pthread_attr_setscope(&realAttributes, PTHREAD_SCOPE_SYSTEM);
  pthread_attr_setinheritsched(&realAttributes, PTHREAD_EXPLICIT_SCHED);
  pthread_attr_setschedpolicy(&realAttributes, SCHED_FIFO);
  pthread_attr_setschedparam(&realAttributes, &fifoLevel);
  pthread_create(&real, &realAttributes, realmain, NULL);
The new thread just sleeps for a small amount (100 usec) of time and then reports the actual time slept. Although I run this app with sudo, it still won't do anything better than the 10-20 ms sleeps you get with standard user scheduling.

I've gotten this to work if you make the whole process real-time, but why can't I just schedule one thread?

I am using 2.4.22-1.2188.nptl (Fedora Core 1). Thanks!
 
  


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