realtime file i/o ?

[Nicholas Mc Guire]

Hi !

 I got a realtime task that reads data from a DAQ and writes it into 
 shm , in user-land the shm is droped to a file . My problem is now
 how can I guarantie that the user-land job will not drop some data
 due to overall system-load ?? just setting a nice value for the 
 user-land job is not realy a guarantie . setting a lock on shm is
 no solution because I can't make the shm block big enough (1GB would
 be the minimum). 

 any ideas ?

thx
nmg