calling mutex_lock() twice from one thread

[Bastian Voigt <bastian@voigt.in-berlin.de>]

Dear list,

according to the documentation pthread_mutex_lock() assigns the mutex to 
the calling thread, and if a different thread calls it again it will be 
blocked.

In my scenario I want one thread to block itself, to be waked up later 
by a signal handler. This does not work by simply calling mutex_lock() 
twice, it does not block.

What can you recommend to achieve this? To be more concrete, I do the 
following:

The main thread loads some configuration, then starts some worker 
threads. After the worker threads are running I want the main thread to 
sleep until a signal (Ctrl-C) arrives. Will it work better when using 
semaphores?

Thanks for any hints!

Bastian Voigt