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# 2008 May 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.
#
#***********************************************************************
#
# Ticket #3093
#
# Verify that a busy callback waiting on a reserved lock resolves
# once the lock clears.
#
# $Id: tkt3093.test,v 1.2 2008/05/02 14:23:55 drh Exp $
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
# Set up a test database
#
do_test tkt3093.1 {
db eval {
CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1);
SELECT * FROM t1
}
} {1}
# Establish a separate, independent connection to that database.
#
do_test tkt3093.2 {
catch {sqlite3_enable_shared_cache 0}
sqlite3 db2 test.db
db2 eval {
SELECT * FROM t1
}
} {1}
# Make sure that clearing a lock allows a pending request for
# a reserved lock to continue.
#
do_test tkt3093.3 {
# This will be the busy callback for connection db2. On the first
# busy callback, commit the transaction in db. This should clear
# the lock so that there should not be a second callback. If the
# busy handler is called a second time, then fail so that we get
# timeout.
proc busy_callback {cnt} {
if {$cnt==0} {
db eval COMMIT
return 0
} else {
return 1
}
}
db2 busy ::busy_callback
# Start a write transaction on db.
db eval {
BEGIN;
INSERT INTO t1 VALUES(2);
}
# Attempt to modify the database on db2
catchsql {
UPDATE t1 SET x=x+1;
} db2
} {0 {}}
# Verify that everything worked as expected. The db transaction should
# have gone first and added entry 2. Then the db2 transaction would have
# run and added one to each entry.
#
do_test tkt3093.4 {
db eval {SELECT * FROM t1}
} {2 3}
do_test tkt3093.5 {
db2 eval {SELECT * FROM t1}
} {2 3}
db2 close
finish_test
|
