I did some testing, and came to the conclusion that, Perl only supports signals in a per process semantic, but not a per thread semantic.

The testing I did is simple: I start a process with two threads, then set up $SIG{ALRM} handler, and call alarm. It doesn't matter whether you call alarm from the main thread or the created thread, the SIGALRM is always delivered to the main thread, i.e. the process. You can imagine that, if I only set up $SIG{ALRM} for the created thread, but not the main thread, then the process will go down, which is the default handling for SIGALRM. ( I tried the same thing for SIGINT with CTRL-C)

Did I lie when I say, Perl only supports per process signal? If yes, I lied, then how to do it in a per thread semantic? I only tested Win, is it different on UNIX? especially Solaris, which I know supports per thread semantic.

In reply to per thread signal? by pg

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