Semaphore

Matlab has a waitfor function but it only works if you have a figure handle, leading to some somewhat out-of-place code if you want to use it with callbacks.

Semaphore.m is a simple wrapper around waitfor to make downstream code a little cleaner. To use it, create a Semaphore object. If this object is passed to an event handler or timer, then that handler can call Semaphore.Release() when it's finished.

If another thread as a Semaphore.Wait() call, it will wait until the respective Semaphore has been released.

Inspired by http://www.mathworks.com/matlabcentral/fileexchange/32489-semaphore, but I wanted something that didn't require an external library.