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NAME
     locks - TeamWare locks file

SYNOPSIS
     Codemgr_wsdata/locks

DESCRIPTION
     To assure consistency, the TeamWare commands (formerly known
     as   CodeManager)   bringover,   ws_undo  and  putback  lock
     workspaces while  they  are  working  in  them.   Locks  are
     recorded in the Codemgr_wsdata/locks file in each workspace;
     the TeamWare commands consult that file before acting  in  a
     workspace.  Information written to the locks file includes:

     o   The type of lock (read/write)

     o   The name of the command issuing the lock

     o   The login name of the user issuing the command

     o   The user's host

     Lock information persists in the locks file for the duration
     of the command's execution; the lock entry is removed before
     the command terminates.

     TeamWare employs two types of locks:

     o   A read-lock is used when a command must  assure  that  a
         workspace does not change while it is examining its con-
         tents.  Read-locks may be  obtained  concurrently  by  a
         number of commands; no TeamWare command may write to the
         workspace while a read-lock is in force.  A read-lock is
         obtained  by the bringover command in the parent when it
         is examining files in preparation  for  copying  to  the
         child, and by the putback command in the child when exa-
         mining files in preparation for copying to the parent.

     o   A write-lock is used when a command must assure  that  a
         workspace  does  not  change  while it is writing to it.
         Only one write-lock may be obtained for a  workspace  at
         any  time.   When  a  write-lock  is  in  force only the
         CodeManager command that owns the lock may write to  the
         workspace  and  other  commands cannot obtain read-locks
         from from the workspace.  A write-lock  is  obtained  by
         the  bringover  command for the child when it is copying
         files into it, and by the putback command for the parent
         when it is copying files into it.

SEE ALSO
     TeamWare User's Guide
     bringover(1), def.dir.flp(1), filemerge(1),  fileresolve(1),
     putback(1),      resolve(1),     twmerge(1),     ws_undo(1),
     workspace(1), access_control(4), args(4), children(4),  con-
     flicts(4),    history(4),   nametable(4),   notification(4),
     parent(4), putback.cmt(4)

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