CHAPTER 3ADVANCED FILE AND DIRECTORY PROCESSING, AND THE REGISTRY
File Locking
An important issue in any system with multiple processes i s coordination and
synchronization of access to shared objects, such as files.
Windows can lock files, in whole or in part, so that no other process (running
program) can access the locked file region. File locks can be read-only (shared ) or
re
ad -write (exclusive). Most important, the locks belong to the process. Any
attempt to access part of a file (using
or ) in violation of an
existing lock will fai l because the locks are mandatoryat the process level. Any
attempt to obtain a conflicting lock will als ...
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