PVCS Version Manager (originally named Polytron Version Control System) is a software package by Serena Software Inc. for revision control of files, in particular source code files.
PVCS follows the "locking" approach to concurrency control; it has no merge operator built-in (but does, nonetheless, have a separate merge command). However PVCS can also be configured to support several users simultaneously attempting to edit the file; in this case the second committer (chronologically speaking) will have a branch created for him/her so that both modifications, instead of conflicting, will appear as parallel histories for the same file. This is unlike CVS and Subversion where the second committer needs to first merge the changes via the update command and then resolve conflicts (when they exist) before actually committing
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