pthread_suspend_np() and interrupt : system block

Hi !

I am trying to test a RT-driver for audio card Ensoniq ES1371.
When i test the driver, the calling program which make a
write(fd,buffer,len) to the driver block all the rt-system,
when the write function do a pthread_suspend_np(pthread_self())

May be there is a mistake with the function pthread_suspend_np()
and the fact that there is an hardware interrupt handler conneted ?

( the driver write data to a DMA buffer, and when the DMA ring-buffer
   become full, the driver must suspend themself to wait an interrupt
   from the audio card which read and free the buffer, and
   wake up the write function :
   But before, when the write function enter in pthread_suspend_np() all
   the system block : no activity in system, keyboard not respond )

Can you help me ?

Thanks.




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