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I'm glad that I won't end-up maintaining your code...

I played with it a bit, took me some time to get the client working without crash:

- A Pthread_attr_init is missing for rx (Client.c:218)...

Try fprintf(stderr, "%p\n", v); to see if the pointer value has become corrupted somehow.

If all you're passing is one integer, why allocate memory at all?

void *value=(void *)42;
int...

Are you working on Linux? If so, can you run your program under valgrind supervision?

I assume that this is a typo - the second pthread_mutex_lock() should be a pthread_mutex_unlock().

pthread_mutex_lock( &_L_LOCK );
Shared_VariableA.uint16 = in;
...

If properly bounded by mutexes(or other synchronization calls) it shouldn't need "volatile". Atomic operations might still need it.

A few problems with writing it in C.

1) You're assuming variables are atomic. Sometimes they're not.

2) You're assuming different threads have access to the same memory/cache. In multicore...