non blocking read

[titanius]

Hi

I am trying to implement a non-blocking read along the lines of peekdata() in matlab http://www.mathworks.de/access/helpdesk/help/toolbox/daq/index.html?/access/helpdesk/help/toolbox/da...

I found that I can do non-blocked reads using read + callbacks http://forums.ni.com/ni/board/message?board.id=230&thread.id=2862

Is there another way to achieve non-blocking reads?   The reason is that if i implement the above using matlab's mex interface, Matlab calls the (mex) C file and i have to do the read (has to wait for the trigger to happen) before returning back from the C file (aka again it becomes blocking). So callbacks are not really useful if thought in a single-threaded way that matlab works.

thanks for reading. 

[Doug_L._Bear · Accepted solution]

The way that the driver is written is to block on a DAQmx read.  In a single threaded method this will always be a blocking call as far as I know.

[titanius]

Thanks a lot.

I was able to get around implementing a non-blocking read in mex was via two threads, one always reading in the background and the other polling it.