/sys$common/syshlp/HELPLIB.HLB  —  POSIX Threads, TIS routines, tis_read_trylock, Associated Routines
       tis_read_lock()
       tis_read_unlock()
       tis_rwlock_destroy()
       tis_rwlock_init()
       tis_write_lock()
       tis_write_trylock()
       tis_write_unlock()
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