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threads and semaphores


how can I keep my parent thread working and responding to user inputs while 
the child thread is waiting for a semaphore using semop() which is held by 
some other process.
In linux the parent thread remains active in such situation but in freebsd 
the parent thread stops responding until the child thread returns from 
Is this implementation dependent feature.
Is there something that lets the child thread release resources while 
waiting for the semaphore.
I used pthread_yield() but didn't work.
I also tried to change the scheduling policy and priority of the child 
thread but of no use.
I am using sys V threads with pthread library on freebsd 5.0 release.
Actually I am porting this code from linux to freebsd and facing this 

somebody please suggest some workaround

Chaudhary Anurag

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