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# 2009 July 2
#
# 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: sharedlock.test,v 1.1 2009/07/02 17:21:58 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix sharedlock
db close
ifcapable !shared_cache {
finish_test
return
}
set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
sqlite3 db test.db
sqlite3 db2 test.db
do_test sharedlock-1.1 {
execsql {
CREATE TABLE t1(a, b);
INSERT INTO t1 VALUES(1, 'one');
INSERT INTO t1 VALUES(2, 'two');
}
} {}
do_test sharedlock-1.2 {
set res [list]
db eval { SELECT * FROM t1 ORDER BY rowid } {
lappend res $a $b
if {$a == 1} { catch { db eval "INSERT INTO t1 VALUES(3, 'three')" } }
# This should fail. Connection [db] has a read-lock on t1, which should
# prevent connection [db2] from obtaining the write-lock it needs to
# modify t1. At one point there was a bug causing the previous INSERT
# to drop the read-lock belonging to [db].
if {$a == 2} { catch { db2 eval "INSERT INTO t1 VALUES(4, 'four')" } }
}
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
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