|author||Eric Wong <email@example.com>||2014-10-04 02:14:21 +0000|
|committer||Eric Wong <firstname.lastname@example.org>||2015-04-22 18:55:32 +0000|
There may be code in a before_fork hook which should run only once, document an example using a guard variable since it may not be immediately obvious to all users. Inspired-by: Bráulio Bhavamitra <email@example.com> http://bogomips.org/unicorn-public/m/20141004015707.GA1951@dcvr.yhbt.net.html
1 files changed, 11 insertions, 0 deletions
diff --git a/examples/unicorn.conf.rb b/examples/unicorn.conf.rb
index 9dce58a..4b28a5a 100644
@@ -54,12 +54,23 @@ GC.respond_to?(:copy_on_write_friendly=) and
# fast LAN.
+# local variable to guard against running a hook multiple times
+run_once = true
before_fork do |server, worker|
# the following is highly recomended for Rails + "preload_app true"
# as there's no need for the master process to hold a connection
+ # Occasionally, it may be necessary to run non-idempotent code in the
+ # master before forking. Keep in mind the above disconnect! example
+ # is idempotent and does not need a guard.
+ if run_once
+ # do_something_once_here ...
+ run_once = false # prevent from firing again
# The following is only recommended for memory/DB-constrained
# installations. It is not needed if your system can house
# twice as many worker_processes as you have configured.