process shared mutex/cond var

I have a bunch of simple programs to test process shared mutex/cond vars 
(attached as zz.tar).

There is a program called store which creates the shared memory and 
prints its pid (the name of the shared memory block is based on the pid).

The program called producer initializes the mutex/cond var in shared 
memory and then goes into a loop writing and broadcasting. It takes the 
store pid as its first argument.

The program called consumer does the pthread_cond_wait thing and also 
takes the store pid as the first argument.

The producer freezes as soon as the consumer starts. The consumer goes 
into an endless loop around the pthread_cond_wait since it returns 
immediately with no error !

Could someone please help me ? These programs work on several platforms 
but that does not mean they are correct.

Thanks.

-Pavan