Re: blocking signals in signal handler -- True or False quiz

From: Andrew Gierth (andrew@erlenstar.demon.co.uk)
Date: 04/25/03 

From: Andrew Gierth <andrew@erlenstar.demon.co.uk>
Date: 25 Apr 2003 00:58:10 +0100

>>>>> "Marc" == Marc Rochkind <rochkind@basepath.com> writes:

 Marc> Is the following statement true or false and, if false, why:

 Marc> "If, when sigaction is called to establish a signal handler for
 Marc> signal S, the sa_mask member of the sigaction structure is
 Marc> filled and the SA_SIGINFO flag is clear, no other signal
 Marc> handler can execute concurrently when signal S is caught."

no other signal handler can _interrupt_ the one for signal S unless
the handler expressly unmasks a signal. In a multithreaded program,
another thread can (in some implementations) take a signal while the
handler is still executing in the first thread. 

-- 
Andrew.
comp.unix.programmer FAQ: see <URL: http://www.erlenstar.demon.co.uk/unix/>

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