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Asked: 2026-05-28T22:48:00+00:00

I have a main() , which spawns a thread, and then joins to it.

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I have a main(), which spawns a thread, and then joins to it.
I want to be able to CTRL-C the program, so I would install SIGINT handler in main (the spawn thread will ignore this signal). When I am in sig-handler I will cancel the spawned thread with cancel(), but what happens with the current ‘join()’, which was active during the signal invocation.
My guess is that I will get EAGAIN or EINTR, and I would have to make join() in loop. Am I right? Thank you.

The question is: Is this legal with mulithreading. I don’t mind to just set a flag withing SIGINT handle, but what happens with the join() call?

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1 Answer

  1. Editorial Team

    Signals and threads? Here be dragons! You have to fully-specify the masks, or else any thread may receive the signal.

    The signal handler should generally not assume it is running in the “main” thread. Rather, it should post a message and return, analagously to thread interruption. The main thread can pick this up later in an event loop or whatever and then join.

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