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List:       freebsd-threads
Subject:    broken signal handling
From:       Jean-Yves Lefort <jylefort () freebsd ! org>
Date:       2007-06-03 19:09:30
Message-ID: 20070603210930.8fae0082.jylefort () FreeBSD ! org
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When a stack overflow occurs, signal handlers are not run (6.2):

libpthread:

	$ cc -pthread -o test test.c
	$ ./test
	Bus error: 10 (core dumped)
	$ ./test thread
	Segmentation fault: 11 (core dumped)

libthr:

	$ cc -lthr -o test test.c
	$ ./test
	signal 10 occurred
	$ ./test thread
	Illegal instruction: 4 (core dumped)

As you can see, the appropriate signal handler is only run with
libthr, provided the stack overflow occurs in the main thread.

I don't know what POSIX has to say on this, but it would nevertheless
be desirable to fix the problem. FYI, it works on Linux 2.6.9.

--
Jean-Yves Lefort

jylefort@FreeBSD.org
http://lefort.be.eu.org/

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