From 4a8f5f80c5535ad99834b32581f693cc7c5300c5 Mon Sep 17 00:00:00 2001
From: Paul Querna <pquerna@apache.org>
Date: Fri, 5 Dec 2008 08:57:16 +0000
Subject: Add comment explaining the startup mutex.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@723665 13f79535-47bb-0310-9956-ffa450edef68
---
 modules/cluster/mod_heartbeat.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/cluster/mod_heartbeat.c b/modules/cluster/mod_heartbeat.c
index df530f6dd3..4eac07cffb 100644
--- a/modules/cluster/mod_heartbeat.c
+++ b/modules/cluster/mod_heartbeat.c
@@ -191,6 +191,9 @@ static void start_hb_worker(apr_pool_t *p, hb_ctx_t *ctx)
         return;
     }
 
+    /* This mutex fixes problems with a fast start/fast end, where the pool 
+     * cleanup was being invoked before the thread completely spawned. 
+     */
     apr_thread_mutex_lock(ctx->start_mtx);
 
     apr_pool_cleanup_register(p, ctx, hb_pool_cleanup, apr_pool_cleanup_null);
-- 
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