Import BSDDB 4.7.25 (as of svn r89086)

db_stat/dd.sh

@@ -0,0 +1,81 @@
+#! /bin/sh
+#	$Id: dd.sh,v 12.1 2006/08/30 16:11:57 bostic Exp $
+#
+# Display environment's deadlocks based on "db_stat -Co" output.
+
+t1=__a
+t2=__b
+
+trap 'rm -f $t1 $t2; exit 0' 0 1 2 3 13 15
+
+if [ $# -ne 1 ]; then
+	echo "Usage: dd.sh [db_stat -Co output]"
+	exit 1
+fi
+
+if `egrep '\<WAIT\>.*\<page\>' $1 > /dev/null`; then
+	n=`egrep '\<WAIT\>.*\<page\>' $1 | wc -l | awk '{print $1}'`
+	echo "dd.sh: $1: $n page locks in a WAIT state."
+else
+	echo "dd.sh: $1: No page locks in a WAIT state found."
+	exit 1
+fi
+
+# Print out list of node wait states, and output cycles in the graph.
+egrep '\<WAIT\>.*\<page\>' $1 | awk '{print $1 " " $5 " " $7}' |
+while read l f p; do
+	for i in `egrep "\<HELD\>.*\<$f\>.*\<page\>.*\<$p\>" $1 |
+	    awk '{print $1}'`; do
+		echo "$l $i"
+	done
+done | tsort > /dev/null 2>$t1
+
+# Display the locks in a single cycle.
+c=1
+display_one() {
+	if [ -s $1 ]; then
+		echo "Deadlock #$c ============"
+		c=`expr $c + 1`
+		cat $1 | sort -n +6
+		:> $1
+	fi
+}
+
+# Display the locks in all of the cycles.
+#
+# Requires tsort output some text before each list of nodes in the cycle,
+# and the actual node displayed on the line be the second (white-space)
+# separated item on the line.  For example:
+#
+#	tsort: cycle in data
+#	tsort: 8000177f
+#	tsort: 80001792
+#	tsort: 80001774
+#	tsort: cycle in data
+#	tsort: 80001776
+#	tsort: 80001793
+#	tsort: cycle in data
+#	tsort: 8000176a
+#	tsort: 8000178a
+#
+# XXX
+# Currently, db_stat doesn't display the implicit wait relationship between
+# parent and child transactions, where the parent won't release a lock until
+# the child commits/aborts.  This means the deadlock where parent holds a
+# lock, thread A waits on parent, child waits on thread A won't be shown.
+if [ -s $t1 ]; then
+	:>$t2
+	while read a b; do
+		case $b in
+		[0-9]*)
+			egrep $b $1 >> $t2;;
+		*)
+			display_one $t2;;
+		esac
+	done < $t1
+	display_one $t2
+else
+	echo 'No deadlocks found.'
+fi
+
+exit 0