From 58f23090fc0af2d93c02da68b06e02d1263df499 Mon Sep 17 00:00:00 2001
From: Krishnan Parthasarathi <kparthas@redhat.com>
Date: Fri, 5 Sep 2014 14:55:01 +0530
Subject: synctask: add backtrace per waiting task

The backtrace is 'saved' in a per-task buffer.
This would come handy while debugging code using
synctasks.

Change-Id: I732b275f6d15b31f31361f5ecf2ba47cacde9b54
BUG: 1138503
Signed-off-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-on: http://review.gluster.org/8622
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
---
 libglusterfs/src/syncop.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'libglusterfs/src/syncop.c')

diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index cc25cd58815..3e176cffc17 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -291,8 +291,10 @@ synctask_yield (struct synctask *task)
         task->proc->sched.uc_flags &= ~_UC_TLSBASE;
 #endif
 
-        if (task->state != SYNCTASK_DONE)
+        if (task->state != SYNCTASK_DONE) {
                 task->state = SYNCTASK_SUSPEND;
+                (void) gf_backtrace_save (task->btbuf);
+        }
         if (swapcontext (&task->ctx, &task->proc->sched) < 0) {
                 gf_log ("syncop", GF_LOG_ERROR,
                         "swapcontext failed (%s)", strerror (errno));
-- 
cgit