Import SQLite 3.8.7.4.

third_party/sqlite/src/test/sharedlock.test

Index: third_party/sqlite/src/test/sharedlock.test
diff --git a/third_party/sqlite/src/test/sharedlock.test b/third_party/sqlite/src/test/sharedlock.test
index 1e78eeafdf936256185197764a3c99fb69f60103..caa48f5bbd4417d63fe495252a528f042c68f326 100644
--- a/third_party/sqlite/src/test/sharedlock.test
+++ b/third_party/sqlite/src/test/sharedlock.test
@@ -13,6 +13,7 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+set testprefix sharedlock
 db close
 
 ifcapable !shared_cache {
@@ -47,9 +48,35 @@ do_test sharedlock-1.2 {
   set res
 } {1 one 2 two 3 three}
 
+
+#-------------------------------------------------------------------------
+# Test that a write-lock is taken on a table when its entire contents
+# are deleted using the OP_Clear optimization.
+#
+foreach {tn delete_sql} {
+  1 { DELETE FROM t2 WHERE 1 }
+  2 { DELETE FROM t2 }
+} {
+  do_execsql_test 2.1 {
+    DROP TABLE IF EXISTS t2;
+    CREATE TABLE t2(x, y);
+    INSERT INTO t2 VALUES(1, 2);
+    INSERT INTO t2 VALUES(3, 4);
+  }
+
+  do_test 2.2 { execsql { SELECT * FROM t2 } db2 } {1 2 3 4}
+
+  do_execsql_test 2.3 " BEGIN; $delete_sql; "
+
+  do_test 2.4 { 
+    catchsql { SELECT * FROM t2 } db2 
+  } {1 {database table is locked: t2}}
+
+  do_execsql_test 2.5 COMMIT
+}
+
+
 db close
 db2 close
-
 sqlite3_enable_shared_cache $::enable_shared_cache
 finish_test
-