The Linux Programmer's Guide <http://metalab.unc.edu/LDP/LDP/lpg/index.html>
discusses semaphores (and the other SysV IPC mechanisms).  There's
also some documentation at the Info node (libc)Posix Semaphores.

-- 
Aaron M. Ucko, KB1CJC <[EMAIL PROTECTED]> (finger [EMAIL PROTECTED])

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