interprocess synchronization primitives such as mutex, condition vars?

Hi,
I want to realize synchronization between mutiple threads in more than
one processes, I learn that  Posix semaphor is supported in Linux 2.6
and can be used in interprocess synchronization.
posix semaphors have operation functions such as sem_open, sem-close,
sem_unlink.
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But I also want to use mutex and condition variables, i just know they
can only be used between mutiple threads in the same process, is it
right?
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Can you tell me if they are supported  for interprocess
synchronization in linux 2.6 and NPTL now? and how to use them?
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bacause pthread_mutex_t and pthread_cond_t variables are defined just
in a process, how can it be seen in anothor process? I know each
semaphor has a name or key to let it expose to all processes, but=20
mutex and cond vars don't have.
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pthread_mutex_setpshared() and pthread_cond_setpshared() could be used?
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please help me, a word will be appriciated.