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Unix Version 7 - man page for lock (v7 section 2)

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LOCK(2) 										  LOCK(2)

       lock - lock a process in primary memory


       If  the	flag  argument	is  non-zero, the process executing this call will not be swapped
       except if it is required to grow.  If the argument is zero, the process is unlocked.  This
       call may only be executed by the super-user.

       Locked  processes  interfere with the compaction of primary memory and can cause deadlock.
       This system call is not considered a permanent part of the system.

       (lock = 53.)
       sys lock; flag

					      local					  LOCK(2)
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