/sys$common/syshlp/helplib.hlb POSIX Threads, TIS routines, tis_cond_wait, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 cond

    Address of the condition variable (passed by reference) on which
    to wait.

 mutex

    Address of the mutex (passed by reference) that is associated
    with the condition variable specified in cond.