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Programming question regarding state variable changes


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I have a state variable called sLastAction - it is set to an integer value which represents, as the name suggests, the most recent "action" that happened in my house - an "action" can be a motion sensor turning on, a wall switch being turned on or off, a Harmony remote control activity starting, door opening, security zone being triggered, etc... - several programs rely on this variable being a specific value to run - they all contain an if statement similar the following "if sLastAction = 128 then..." - my question is:

What happens if the variable changes twice rapidly before the first program testing the first value gets to run?

Will that program be put into a queue so that it is guaranteed to run?  And the test condition will still be true?

Sorry, if this has been asked before




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