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P4 Server Administration Documentation | 2025.1

# Implement site-wide exclusive locking with p4 typemap

By default, P4 Server supports concurrent development. However, environments in which only one person is expected to have a file open for edit at a time can implement site-wide exclusive locking by using the `+l` (exclusive open) modifier as a partial filetype.

If you use the following typemap, the `+l` modifier is automatically applied to all newly added files in the depot:

    Typemap:
            +l //depot/...

If you use this typemap,

- any file your users add to the depot after you update your typemap automatically has the `+l` modifier applied

- at any given time, only one user can have the file opened

The typemap table applies only to new additions to the depot:

- after you update the typemap table for site-wide exclusive open, files previously submitted without `+l` must be opened for edit with `p4 edit -t+l `filename`` and resubmitted

- similarly, users with files already open for edit must update their filetypes with `p4 reopen -t+l `filename``

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