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    <p>You can use a pthread mutex in shared memory pthread_mutexattr_setpshared ( <a href="http://linux.die.net/man/3/pthread_mutexattr_setpshared" rel="nofollow noreferrer">http://linux.die.net/man/3/pthread_mutexattr_setpshared</a> ) </p> <p>Also you could try to use futexes directly see <a href="http://people.redhat.com/drepper/futex.pdf" rel="nofollow noreferrer">http://people.redhat.com/drepper/futex.pdf</a> and <a href="http://lxr.linux.no/#linux+v2.6.34/Documentation/robust-futexes.txt" rel="nofollow noreferrer">http://lxr.linux.no/#linux+v2.6.34/Documentation/robust-futexes.txt</a> and <a href="http://www.kernel.org/doc/man-pages/online/pages/man7/futex.7.html" rel="nofollow noreferrer">http://www.kernel.org/doc/man-pages/online/pages/man7/futex.7.html</a> and <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/futex.2.html" rel="nofollow noreferrer">http://www.kernel.org/doc/man-pages/online/pages/man2/futex.2.html</a> particularaly the second one since that talks about getting the kernel to release it when a process holding it dies.</p> <p>Also I think it's possible to make the pthreads locks/CVs robust, which is a better idea since then all the stuff for handling robust locks is done for you (in an even remotely modern distro it should be using the robust futexs described in <a href="http://lxr.linux.no/#linux+v2.6.34/Documentation/robust-futexes.txt" rel="nofollow noreferrer">http://lxr.linux.no/#linux+v2.6.34/Documentation/robust-futexes.txt</a> for pthread_mutex IIRC since that's been in the kernel for quite a while, but you might want to make sure you don't need to do anything to make your pthread_mutex robust)</p>
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