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.