Threads and signals

[Ivan Voras <ivoras_(_at_)_freebsd_(_dot_)_org>]

Hi,

How do threads interact with signals? In particular, if I have a "main"
process thread (the one started by main()) which generates items for a
mutex-protected queue which are consumed by a worker thread, and I need
to insert an item in the queue from the signal handler, am I correct
that doing pthread_mutex_lock() from the signal handler could deadlock
if the signal handler is executed by any of the threads (and the mutex
is non-recursive)?

How is this solved in general? By recursive mutexes?

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