search for: libguestfs_mutex_file

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2013 Feb 18
4
[PATCH for discussion only 0/3] Implement mutexes to limit number of concurrent instances of libguestfs.
...irt has raised concerns about how to limit the number of libguestfs appliances that can run to prevent this from interfering with their ordinary guests. The mutex is easy to use: You specify a POSIX semaphore file and the maximum number of instances you want to allow to run at the same time, eg: LIBGUESTFS_MUTEX_FILE=/guestfs.mutex LIBGUESTFS_MUTEX_LIMIT=3 export LIBGUESTFS_MUTEX_FILE LIBGUESTFS_MUTEX_LIMIT As long as each handle has the same settings, the limit is applied transparently, with handles over the limit waiting for earlier ones to finish. (These can of course also be set through the API). There...