ericcrosson / bash-barrier

A synchronization barrier for your terminal

bash-barrier

This project provides a barrier for the synchronization of shell scripts or terminal commands. The shells to be synchronized can be local or remote.

Install

This script is standalone -- download it and ensure it is in your $PATH.

Use

The basic blocking syntax is to invoke the script:

barrier

This will pause execution until another shell has reached the barrier. To wait for multiple notifications, add a numeric argument:

barrier 3

To notify waiting shells that you have reached a barrier, invoke barrier with the hosts to notify as arguments:

barrier localhost
barrier host1 host2 host3

Advanced

To use multiple, independent barriers that should not notify each other, customize the PORT environment variable in the executing shell. For example:

PORT=5656 barrier

will wait for a different shell to execute:

PORT=5656 barrier localhost

and any barriers listening on the default port (64926) will not be affected.

Limitations

This is implemented in-shell for-shell. This is not a performant package. In use cases where multiple broadcasts may be received in a narrow time window, some may be dropped by the listener. The casual user will be fine.

bash-barrier's Issues

Implement the usable interface

Consider a shortcut for `barrier localhost`

Consider printing pings as they arrive

Add travis-ci