# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1417488896 -10800
# Node ID f436e9a60b8fba5b94b3b5e96258807ab80dae51
# Parent  8dfee01ff0bdd13de01ba5635d58a584d460e172
Cache: proper wakeup of subrequests.

In case of a cache lock timeout and in the aio handler we now call
r->write_event_handler() instead of a connection write handler,
to make sure to run appropriate subrequest.  Previous code failed to run
inactive subrequests and hence resulted in suboptimal behaviour, see
report by Yichun Zhang:

http://mailman.nginx.org/pipermail/nginx-devel/2013-October/004435.html

(Infinite hang claimed in the report seems impossible without 3rd party
modules, as subrequests will be eventually woken up by the postpone filter.)

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -462,6 +462,8 @@ ngx_http_file_cache_lock_wait_handler(ng
                    "http file cache wait: \"%V?%V\"", &r->uri, &r->args);
 
     ngx_http_file_cache_lock_wait(r, r->cache);
+
+    ngx_http_run_posted_requests(c);
 }
 
 
@@ -505,7 +507,7 @@ wakeup:
 
     c->waiting = 0;
     r->main->blocked--;
-    r->connection->write->handler(r->connection->write);
+    r->write_event_handler(r);
 }
 
 
@@ -692,7 +694,9 @@ ngx_http_cache_aio_event_handler(ngx_eve
     r->main->blocked--;
     r->aio = 0;
 
-    r->connection->write->handler(r->connection->write);
+    r->write_event_handler(r);
+
+    ngx_http_run_posted_requests(c);
 }
 
 #endif