volatile bools work, but just know that every time you check it you are doing a non-cached memory read (relatively slow). It can't read from the cache/registers (much faster) because other threads/processes are allowed to modify it at any time (and when they do, they don't/can't modify the cached/in-register copy). I used to use volatile bools in a similar fashion before I discovered Qt... but Qt provides much better ways for managing threads.
If you only need to read from the serial port periodically, you can set your backend up like I did for backend2 in the exampe... which also uses a timer. ....but if it ain't broke, don't fix it... d3fault
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