[nginx] Win32: accept_mutex now always disabled (ticket #362).

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/1b70200d83e3
branches:  stable-1.4
changeset: 5275:1b70200d83e3
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Fri May 31 14:59:26 2013 +0400
description:
Win32: accept_mutex now always disabled (ticket #362).

Use of accept mutex on win32 may result in a deadlock if there are multiple
worker_processes configured and the mutex is grabbed by a process which
can't accept connections.

diffstat:

 src/event/ngx_event.c |  11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diffs (21 lines):

diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -607,6 +607,17 @@ ngx_event_process_init(ngx_cycle_t *cycl
         ngx_use_accept_mutex = 0;
     }
 
+#if (NGX_WIN32)
+
+    /*
+     * disable accept mutex on win32 as it may cause deadlock if
+     * grabbed by a process which can't accept connections
+     */
+
+    ngx_use_accept_mutex = 0;
+
+#endif
+
 #if (NGX_THREADS)
     ngx_posted_events_mutex = ngx_mutex_init(cycle->log, 0);
     if (ngx_posted_events_mutex == NULL) {