tree 916fcd6294ae9a43020634dd08b88b7187e65701
parent 70b1e50febca7562bf9e79857a7bd16bd2072185
author Willy Tarreau <w@1wt.eu> 1567156621 +0200
committer Willy Tarreau <w@1wt.eu> 1567159138 +0200
encoding latin1

MEDIUM: ring: implement a wait mode for watchers

Now it is possible for a reader to subscribe and wait for new events
sent to a ring buffer. When new events are written to a ring buffer,
the applets that are subscribed are woken up to display new events.
For now we only support this with the CLI applet called by "show events"
since the I/O handler is indeed a CLI I/O handler. But it's not
complicated to add other mechanisms to consume events and forward them
to external log servers for example. The wait mode is enabled by adding
"-w" after "show events <sink>". An extra "-n" was added to directly
seek to new events only.