glusterd: adding a comment for code readability

Adding a comment in the source code, so that anyone reading
the code will understand the changes done by d4fa29 better.

fixes: bz#1654270

Change-Id: I75aff4243420c434c47d69a4b310f77bf161bb29
Signed-off-by: Sanju Rakonde <srakonde@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index 9ee88b6d57b..8d3c71e8988 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -1642,6 +1642,16 @@ cleanup_and_exit(int signum)
 #endif
 
         trav = NULL;
+
+        /* previously we were releasing the cleanup mutex lock before the
+           process exit. As we are releasing the cleanup mutex lock, before
+           the process can exit some other thread which is blocked on
+           cleanup mutex lock is acquiring the cleanup mutex lock and
+           trying to acquire some resources which are already freed as a
+           part of cleanup. To avoid this, we are exiting the process without
+           releasing the cleanup mutex lock. This will not cause any lock
+           related issues as the process which acquired the lock is going down
+         */
         /* NOTE: Only the least significant 8 bits i.e (signum & 255)
            will be available to parent process on calling exit() */
         exit(abs(signum));