You fclose the handle when you're done, or you create some kind of synchronized semaphore, if you wanna be extra. The issue is really around having multiple ha

You fclose the handle when you're done, or you create some kind of synchronized semaphore, if you wanna be extra. The issue is really around having multiple handles for writing (not just reading or appending), and the number of times you actually have this problem here is vanishingly rare.