https://github.com/timbunce/semaphoric

lightweight counting semaphore concurrency control shell utility using flock
https://github.com/timbunce/semaphoric

Last synced: about 16 hours ago
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lightweight counting semaphore concurrency control shell utility using flock

• Host: GitHub
• URL: https://github.com/timbunce/semaphoric
• Owner: timbunce
• License: apache-2.0
• Created: 2015-02-22T13:19:57.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2015-03-18T12:55:15.000Z (almost 10 years ago)
• Last Synced: 2023-04-21T14:10:55.690Z (over 1 year ago)
• Language: Shell
• Homepage:
• Size: 137 KB
• Stars: 6
• Watchers: 3
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
semaphoric - lightweight counting semaphore concurrency control using flock

===========================================================================

A utility to limit concurrency by running a command only if fewer than some

number of other commands (associated with an arbitrary id) are running.

The id defines the scope of the semaphore.

If id contains a / then it's treated as the directory to store the semaphores.

Otherwise they're stored in /tmp/semaphoric-$USER/.

Features:

- very lightweight (unlike gnu parallels sem utility)

- most callers block cheaply on file lock until ready

- only one process (the next-to-be-run) polls for a semaphore

- first-in-first-out queuing, no starvation or similar risks

- uses filehandle locks (not SysV semaphores) so is robust and stable

- returns the exit status of the command that was run