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    <h3>EDIT:</h3> <p>After seeing your edit, a simple solution not involving the use of any toolboxes is the following: </p> <p>Since <code>MAT_2</code> is much slower than <code>MAT_1</code>, start <code>MAT_2</code> with a delay. i.e., start it when <code>MAT_1</code> has finished processing say 5 images or so. If you do this, <code>MAT_2</code> will never catch up with <code>MAT_1</code> and hence will never be in a situation where it has to "wait" for images from <code>MAT_1</code>.</p> <hr> <p>I'm still not clear on a few things from your question:</p> <ol> <li>You say <code>MAT_1</code> processes images sequentially, but <em>does it have to</em>? In other words, does the order in which they are processed matter?</li> <li>You say <code>MAT_2</code> reads the output from <code>MAT_1</code>... Does it have to be in the order that <code>MAT_1</code> finishes or can that be any order?</li> <li>You say <code>MAT_2</code> reads the image using <code>imread</code> and outputs it some where else. Is there any reason that task cannot be combined into <code>MAT_1</code>? </li> </ol> <p>In any case, you can implement some form of execution blocking using the parallel computing toolbox; but instead of using <code>parfor</code> loops (which is what most people use), you'll have to create a distributed job (<a href="http://www.mathworks.com/help/toolbox/distcomp/bq5ntwk.html" rel="nofollow">example</a>).</p> <p>The important thing to note is that each worker (lab) has a <a href="http://www.mathworks.com/help/toolbox/distcomp/labindex.html" rel="nofollow"><code>labindex</code></a>, and you can use <a href="http://www.mathworks.com/help/toolbox/distcomp/labsend.html" rel="nofollow"><code>labSend</code></a> to send data from worker 1 (equivalent of <code>MAT_1</code>) to worker 2 (equivalent of <code>MAT_2</code>), who then receives it using <a href="http://www.mathworks.com/help/toolbox/distcomp/labreceive.html" rel="nofollow"><code>labReceive</code></a>. From the documentation on <code>labReceive</code>:</p> <blockquote> <p>This function blocks execution in the lab until the corresponding call to labSend occurs in the sending lab.</p> </blockquote> <p>which is pretty much what you wanted to do with <code>MAT_1</code> and <code>MAT_2</code>.</p> <p>Another way to do this would be to spawn one additional worker in your current session, but only assign tasks performed by <code>MAT_1</code> to it. You then set the <a href="http://www.mathworks.com.au/help/toolbox/distcomp/finishedfcn.html" rel="nofollow"><code>FinishedFcn</code></a> property for the tasks to execute the set of functions performed by <code>MAT_2</code>, but I wouldn't recommend it as I don't think this was the intent for <code>FinishedFcn</code>, and I don't know if it will break in certain cases. </p>
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    1. POSemaphores and locks in MATLAB
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    1. COThanks @yoda. I might be wrong but I think the last time I used the PCT, it didn't have anything such as `labsend` and `labreceive`. That definitely helps! As for why I require `MAT_1` and `MAT_2` to run in parallel threads, the processing done in `MAT_2` is much slower than that of `MAT_1`, and the output of `MAT_1` feeds other programs and processes (including human inspection) that do not _need_ to wait for `MAT_2` to do its job. In any case, and to clarify (I"ll put it on the original post), I'm particularly interested in solutions that do not require a PCT license.
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    2. CO@AmV: You are correct in that PCT and DCT (distributed computing toolbox) used to be different, but now they've been merged into one. I guess I'll wait for your edit, as more info will certainly be helpful.
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    3. CO@AmV: Please see my edit for a simpler solution that does not involve any toolbox.
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