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+# 2005 January 19
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# $Id: shared2.test,v 1.8 2009/06/05 17:09:12 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+source $testdir/lock_common.tcl
+source $testdir/malloc_common.tcl
+db close
+
+ifcapable !shared_cache {
+  finish_test
+  return
+}
+set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
+
+# Test that if we delete all rows from a table any read-uncommitted 
+# cursors are correctly invalidated. Test on both table and index btrees.
+do_test shared2-1.1 {
+  sqlite3 db1 test.db
+  sqlite3 db2 test.db
+
+  # Set up some data. Table "numbers" has 64 rows after this block 
+  # is executed.
+  execsql {
+    BEGIN;
+    CREATE TABLE numbers(a PRIMARY KEY, b);
+    INSERT INTO numbers(oid) VALUES(NULL);
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    INSERT INTO numbers(oid) SELECT NULL FROM numbers;
+    UPDATE numbers set a = oid, b = 'abcdefghijklmnopqrstuvwxyz0123456789';
+    COMMIT;
+  } db1
+} {}
+do_test shared2-1.2 {
+  # Put connection 2 in read-uncommitted mode and start a SELECT on table 
+  # 'numbers'. Half way through the SELECT, use connection 1 to delete the
+  # contents of this table.
+  execsql {
+    pragma read_uncommitted = 1;
+  } db2
+  set count [execsql {SELECT count(*) FROM numbers} db2]
+  db2 eval {SELECT a FROM numbers ORDER BY oid} {
+    if {$a==32} {
+      execsql {
+        BEGIN;
+        DELETE FROM numbers;
+      } db1
+    }
+  }
+  list $a $count
+} {32 64}
+do_test shared2-1.3 {
+  # Same test as 1.2, except scan using the index this time.
+  execsql {
+    ROLLBACK;
+  } db1
+  set count [execsql {SELECT count(*) FROM numbers} db2]
+  db2 eval {SELECT a, b FROM numbers ORDER BY a} {
+    if {$a==32} {
+      execsql {
+        DELETE FROM numbers;
+      } db1
+    }
+  }
+  list $a $count
+} {32 64}
+
+
+db1 close
+db2 close
+
+do_test shared2-3.2 {
+  sqlite3_enable_shared_cache 1
+} {1}
+
+forcedelete test.db
+
+sqlite3 db test.db
+do_test shared2-4.1 {
+  execsql {
+    CREATE TABLE t0(a, b);
+    CREATE TABLE t1(a, b DEFAULT 'hello world');
+  }
+} {}
+db close
+
+sqlite3 db test.db
+sqlite3 db2 test.db
+
+do_test shared2-4.2 {
+  execsql { SELECT a, b FROM t0 } db
+  execsql { INSERT INTO t1(a) VALUES(1) } db2
+} {}
+
+do_test shared2-4.3 {
+  db2 close
+  db close
+} {}
+
+# At one point, this was causing a crash.
+#
+do_test shared2-5.1 {
+  sqlite3 db test.db
+  sqlite3 db2 test.db
+  execsql { CREATE TABLE t2(a, b, c) }
+  
+  # The following statement would crash when attempting to sqlite3_free()
+  # a pointer allocated from a lookaside buffer.
+  execsql { CREATE INDEX i1 ON t2(a) } db2
+} {}
+
+db close
+db2 close
+
+# The following test verifies that shared-cache mode does not automatically
+# turn on exclusive-locking mode for some reason.
+do_multiclient_test {tn} {
+  sql1 { CREATE TABLE t1(a, b) }
+  sql2 { CREATE TABLE t2(a, b) }
+  do_test shared2-6.$tn.1 { sql1 { SELECT * FROM t2 } } {}
+  do_test shared2-6.$tn.2 { sql2 { SELECT * FROM t1 } } {}
+}
+
+sqlite3_enable_shared_cache $::enable_shared_cache
+finish_test