diff options
Diffstat (limited to 'doc/s6-notifywhenup.html')
| -rw-r--r-- | doc/s6-notifywhenup.html | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/s6-notifywhenup.html b/doc/s6-notifywhenup.html index cdd487c..cdfa693 100644 --- a/doc/s6-notifywhenup.html +++ b/doc/s6-notifywhenup.html @@ -18,6 +18,27 @@ <h1> The s6-notifywhenup program </h1> +<em> +<p> +Starting with s6-2.1.4.0, the s6-notifywhenup program has been deprecated, +because there was still a case (albeit extremely rare) where a race +condition would occur and readiness would be improperly advertised. +Readiness notification for a service can now be achieved via a +<tt>notification-fd</tt> file in the +<a href="servicedir.html">service directory</a>, containing the +number of the descriptor the service will write its readiness +notification newline to. The notification will directly be picked by +<a href="s6-supervise.html">s6-supervise</a>. <br /> +</p> + +<p> + Quick upgrade recipe: for every service using s6-notifywhenup, +replace the s6-notifywhenup invocation in your run script with +<tt>fdmove 1 3</tt>, then perform <tt>echo 3 > notification-fd</tt>. +Done! +</p> +</em> + <p> s6-notifywhenup launches a daemon while listening to a file descriptor, and sends a 'U' event to a <a href="fifodir.html">fifodir</a> when it |