From 7c0ed171a06addc09f8cd4796bac32821120cf5b Mon Sep 17 00:00:00 2001
From: vraatikka <vilho.raatikka@skysql.com>
Date: Thu, 15 Aug 2013 22:45:11 +0300
Subject: [PATCH] Added trace log to event handling.

---
 server/core/dcb.c  | 35 ++++++++++++++++++++++++++++++++++-
 server/core/poll.c | 13 ++++++++++++-
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/server/core/dcb.c b/server/core/dcb.c
index 576b287db..d6d137e13 100644
--- a/server/core/dcb.c
+++ b/server/core/dcb.c
@@ -425,6 +425,19 @@ pthread_t tid = pthread_self();
 			saved_errno = errno;
 			if (w < 0)
 			{
+                            skygw_log_write(
+                                    LOGFILE_ERROR,
+                                    "%lu [dcb_write] Write to %d failed, errno %d",
+                                    tid,
+                                    dcb->fd,
+                                    saved_errno);
+                            skygw_log_write(
+                                    LOGFILE_TRACE,
+                                    "%lu [dcb_write] Write to %d failed, errno %d",
+                                    tid,
+                                    dcb->fd,
+                                    saved_errno);
+
 				break;
 			}
 
@@ -476,6 +489,7 @@ dcb_drain_writeq(DCB *dcb)
 int n = 0;
 int w;
 int saved_errno = 0;
+pthread_t tid = pthread_self();
 
 	spinlock_acquire(&dcb->writeqlock);
 	if (dcb->writeq)
@@ -494,7 +508,20 @@ int saved_errno = 0;
 			saved_errno = errno;
 			if (w < 0)
 			{
-				break;
+                            skygw_log_write(
+                                    LOGFILE_ERROR,
+                                    "%lu [dcb_drain_writeq] Write to %d failed, errno %d",
+                                    tid,
+                                    dcb->fd,
+                                    saved_errno);
+                            skygw_log_write(
+                                    LOGFILE_TRACE,
+                                    "%lu [dcb_drain_writeq] Write to %d failed, errno %d",
+                                    tid,
+                                    dcb->fd,
+                                    saved_errno);
+                            
+                            break;
 			}
 
 			/*
@@ -506,6 +533,12 @@ int saved_errno = 0;
 			{
 				/* We didn't write all the data */
 			}
+                        skygw_log_write(
+                                LOGFILE_TRACE,
+                                "%lu [dcb_drain_writeq] Wrote %d Bytes to %d",
+                                tid,
+                                w,
+                                dcb->fd);                                                
 			n += w;
 		}
 	}
diff --git a/server/core/poll.c b/server/core/poll.c
index 5262140f0..c351b4c38 100644
--- a/server/core/poll.c
+++ b/server/core/poll.c
@@ -194,8 +194,19 @@ bool                    no_op = FALSE;
 				DCB 		*dcb = (DCB *)events[i].data.ptr;
 				__uint32_t	ev = events[i].events;
 
+                                skygw_log_write(
+                                        LOGFILE_TRACE,
+                                        "%lu [poll_waitevents] event %d",
+                                        tid,
+                                        ev);
 				if (DCB_ISZOMBIE(dcb))
-					continue;
+                                {
+                                        skygw_log_write(
+                                                LOGFILE_TRACE,
+                                                "%lu [poll_waitevents] dcb is zombie",
+                                                tid);
+                                        continue;
+                                }
 
 				if (ev & EPOLLERR)
 				{