Add explicit log flushing when backend connections close to keep log...

Add explicit log flushing when backend connections close to keep log chronology. This is to avoid log lines for the same (reused) FD coming before the closing connection when load is high.

Fixes #739


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5160 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_backend.c

@@ -370,6 +370,11 @@ vbe_GetVbe(struct sess *sp, struct vdi_simple *vs)
 		}
 		VSC_main->backend_toolate++;
 		WSL(sp->wrk, SLT_BackendClose, vc->fd, "%s", bp->vcl_name);
+
+		/* Checkpoint log to flush all info related to this connection
+		   before the OS reuses the FD */
+		WSL_Flush(sp->wrk, 0);
+
 		TCP_close(&vc->fd);
 		VBE_DropRefConn(bp);
 		vc->backend = NULL;

bin/varnishd/cache_dir.c

@@ -52,6 +52,11 @@ VDI_CloseFd(struct sess *sp)
 	bp = sp->vbc->backend;
 
 	WSL(sp->wrk, SLT_BackendClose, sp->vbc->fd, "%s", bp->vcl_name);
+
+	/* Checkpoint log to flush all info related to this connection
+	   before the OS reuses the FD */
+	WSL_Flush(sp->wrk, 0);
+
 	TCP_close(&sp->vbc->fd);
 	VBE_DropRefConn(bp);
 	sp->vbc->backend = NULL;