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Real-time Signalssection.kill -lRTMINstarts at 34, not 32 as per you referenced document. This one says it starts at 33, but goes on to say that you shouldn't reference them by numbers as the numbers may vary depending on glibc threading implementation.SIGRTMINset with a#defineline because that number is subject to possible change later when the executable is run. This would have shown up a few years ago when both pthread libs were in use if an application compiled against the one pthread library was run on a system that had been rebooted with the other!