According to the man pages for sem_wait, etc., POSIX semaphores are available in Linux 2.6 (with the right NTPL threading in glibc). However, I have a program that compiles just fine but won't link because it can't find the library for the semaphore operations. What am I missing? I ran a find and grep through all the libc's on the system and they turned up nothing: $ find /lib /usr/lib -name "*libc\.*" -print -exec nm {} 2>/dev/null \; | grep sem_ (no results) Time is critical (yeah, I know...). Thanks. mhr -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080206/9995d3b7/attachment-0004.html>