sched_setscheduler() gives errno EPERM

[Mats Lindbeg]

All,
I have a small program that simply changes the scheduling policy to SCHED_RR with sched_setscheduler and then exec's into another program. This worked fine in FBSD 5.x and 6.x. Now when I'm migrating to 8.1 I get EPERM from the the setscheduler call.
I have learned that If I start the same program with 'rtprio' it is allowed to change the scheduler. Strange to me - since I have always run it as root. What is the policy in 8.1?? Can this behavior be circumvented somehow? Some sysctl?
regards 
/Mats