Add max time limit to 00840_long_concurrent_select_and_drop_deadlock

tests/queries/0_stateless/00840_long_concurrent_select_and_drop_deadlock.sh

@@ -19,15 +19,39 @@ trap cleanup EXIT
 
 $CLICKHOUSE_CLIENT -q "create view view_00840 as select count(*),database,table from system.columns group by database,table"
 
-for _ in {1..100}; do
+
+function thread_drop_create()
+{
+    local TIMELIMIT=$((SECONDS+$1))
+    local it=0
+    while [ $SECONDS -lt "$TIMELIMIT" ] && [ $it -lt 100 ];
+    do
+        it=$((it+1))
         $CLICKHOUSE_CLIENT -nm -q "
             drop table if exists view_00840;
             create view view_00840 as select count(*),database,table from system.columns group by database,table;
         "
-done &
-for _ in {1..250}; do
+    done
+}
+
+function thread_select()
+{
+    local TIMELIMIT=$((SECONDS+$1))
+    local it=0
+    while [ $SECONDS -lt "$TIMELIMIT" ] && [ $it -lt 250 ];
+    do
+        it=$((it+1))
         $CLICKHOUSE_CLIENT -q "select * from view_00840 order by table" >/dev/null 2>&1 || true
-done &
+    done
+}
+
+
+export -f thread_drop_create
+export -f thread_select
+
+TIMEOUT=60
+thread_drop_create $TIMEOUT &
+thread_select $TIMEOUT &
 
 wait
 trap '' EXIT