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Subj : Re: Using SIGALRM with pthread
To   : comp.programming.threads
From : gc
Date : Thu Jul 28 2005 10:04 am

I am thinking about implementing a seperate timer thread as well. In my
original implementation, the pthread_cond_wait is not interrupted by
the signal. All the semaphores, pthread_mutex's and pthread_cond's are
used for protecting shared variables and condition variables between
the two threads. And in one of thread, I want to have an asynchronous
alarm signal system that periodically updates certain data structures
and perform certain tasks.  By the way, my signal-catching function
only belongs to one of the two threads.

I wonder if anybody can give me a concrete explanation why is the use
of signal handling in a thread can potentially cause many werid bugs. I
have read from some resources that the signal handling function in a
thread should be kept as simple as possible, but anybody can give a
reason for this or suggests any good resource on this?

I really appreciate your help,

gc

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