running three functions simultaneously

I want to run three functions simultaneously, each of which uses real time videos from two usb cameras. One program stores the video frames in a folder,the second one stores the real time feed as a video and the third one processes the real time frames.I have developed the individual functions but i want to run them simultaneously.I have searched a lot but couldn't find an appropriate solution.Please help!!!its urgent!!!

[Sean de Wolski]

You should be able to do what you want with timer functions. It won't be "Perfectly Simultaneous", but how simultaneous do you need?

Answer 1

[Jan]

Matlab runs a single thread only. So sou have to start 3 Matlab sessions.

[Paulo Silva]

+1 vote, wish it could run more threads simultaneously

[Edric Ellis]

While it's true that there's only a single user-visible thread, many MATLAB functions are multithreaded behind the scenes. When this is availalble, it's generally much more efficient than explicit thread management. Of course, that doesn't help the OP in this case where several completely separate tasks are needed simultaneously.

[Jan]

@Edric: Several threads can be started inside a Mex function. It is not necessary that all threads are finished before the Mex function returns to the caller. But these threads are not allowed to call Matlab API functions like mxCreateXYZ. And unfortunately mexCallMATLAB crashs when called from multiple threads.

Answer 2

[Jason Ross]

Although it may not solve all of your problems, this thread might help you out (where Jan and Paulo have already contributed!)

http://www.mathworks.com/matlabcentral/answers/2081-how-to-execute-two-matlab-scripts-simultaneously

[Paulo Silva]

Jan was right and I was wrong when we contributed to that thread, I still wish to be right because it would be useful for many projects to have just one MATLAB instance open running several functions at the same time.