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# 2008 May 2
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# Ticket #3093
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#
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# Verify that a busy callback waiting on a reserved lock resolves
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# once the lock clears.
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#
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# $Id: tkt3093.test,v 1.2 2008/05/02 14:23:55 drh Exp $
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Set up a test database
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#
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do_test tkt3093.1 {
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db eval {
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CREATE TABLE t1(x);
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INSERT INTO t1 VALUES(1);
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SELECT * FROM t1
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}
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} {1}
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# Establish a separate, independent connection to that database.
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#
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do_test tkt3093.2 {
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catch {sqlite3_enable_shared_cache 0}
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sqlite3 db2 test.db
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db2 eval {
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SELECT * FROM t1
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}
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} {1}
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# Make sure that clearing a lock allows a pending request for
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# a reserved lock to continue.
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#
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do_test tkt3093.3 {
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# This will be the busy callback for connection db2. On the first
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# busy callback, commit the transaction in db. This should clear
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# the lock so that there should not be a second callback. If the
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# busy handler is called a second time, then fail so that we get
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# timeout.
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proc busy_callback {cnt} {
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if {$cnt==0} {
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db eval COMMIT
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return 0
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} else {
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return 1
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}
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}
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db2 busy ::busy_callback
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# Start a write transaction on db.
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db eval {
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BEGIN;
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INSERT INTO t1 VALUES(2);
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}
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# Attempt to modify the database on db2
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catchsql {
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UPDATE t1 SET x=x+1;
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} db2
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} {0 {}}
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# Verify that everything worked as expected. The db transaction should
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# have gone first and added entry 2. Then the db2 transaction would have
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# run and added one to each entry.
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#
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do_test tkt3093.4 {
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db eval {SELECT * FROM t1}
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} {2 3}
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do_test tkt3093.5 {
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db2 eval {SELECT * FROM t1}
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} {2 3}
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db2 close
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finish_test
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