120 lines
3.9 KiB
Plaintext
120 lines
3.9 KiB
Plaintext
# 2009 April 10
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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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# This file implements regression tests for SQLite library.
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#
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# This file implements tests to verify that ticket #3793 has been
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# fixed.
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#
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# $Id: tkt3793.test,v 1.2 2009/06/01 16:42:18 shane Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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ifcapable !shared_cache||!attach {
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finish_test
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return
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}
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set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
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do_test tkt3793-1.1 {
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# This is taken from shared.test. The Windows VFS expands
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# ./test.db (and test.db) to be the same thing so the path
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# matches and they share a cache. By changing the case
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# for Windows platform, we get around this and get a separate
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# connection.
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if {$::tcl_platform(platform)=="unix"} {
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sqlite3 db1 test.db
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sqlite3 db2 test.db
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} else {
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sqlite3 db1 TEST.DB
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sqlite3 db2 TEST.DB
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}
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execsql {
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BEGIN;
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CREATE TABLE t1(a, b);
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CREATE TABLE t2(a PRIMARY KEY, b);
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INSERT INTO t1 VALUES(randstr(50,50), randstr(50,50));
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1;
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INSERT INTO t2 SELECT * FROM t1;
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COMMIT;
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}
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} {}
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proc busyhandler {db args} { set ::busyconnection $db ; return 1 }
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db2 busy {busyhandler db2}
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db1 busy {busyhandler db1}
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# Establish a read-lock on the database file using connection [db].
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#
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do_test tkt3793-1.2 {
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execsql {
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BEGIN;
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SELECT count(*) FROM t1;
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}
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} {1024}
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# Set the size of the cache shared by [db1] and [db2] to 10. Then update
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# more than 10 pages of table t1. At this point the shared-cache will
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# hold a RESERVED lock on the database file. Even though there are now
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# more than 10 dirty pages in memory, it cannot upgrade to an EXCLUSIVE
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# lock because of the read-lock held by [db].
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#
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do_test tkt3793-1.3 {
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execsql {
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PRAGMA cache_size = 10;
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BEGIN;
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UPDATE t1 SET b = randstr(50,50);
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} db1
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} {}
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set x 0
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# Run one SELECT query on the shared-cache using [db1], then from within
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# the callback run another via [db2]. Because of the large number of dirty
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# pages within the cache, each time a new page is read from the database
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# SQLite will attempt to upgrade to an EXCLUSIVE lock, and hence invoke
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# the busy-handler. The tests here verify that the correct busy-handler
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# function is invoked (the busy-handler associated with the database
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# connection that called sqlite3_step()). When bug #3793 existed, sometimes
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# the [db2] busy-handler was invoked from within the call to sqlite3_step()
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# associated with [db1].
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#
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# Note: Before the bug was fixed, if [db2] was opened with the "-fullmutex 1"
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# option, then this test case would cause an assert() to fail.
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#
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set ::busyconnection db1
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db1 eval {SELECT * FROM t2 ORDER BY a LIMIT 20} {
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do_test tkt3793-2.[incr x] { set ::busyconnection } db1
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set ::busyconnection db2
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db2 eval { SELECT count(*) FROM t2 }
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do_test tkt3793-2.[incr x] { set ::busyconnection } db2
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set ::busyconnection db1
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}
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do_test tkt3793-3 {
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db1 close
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db2 close
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} {}
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sqlite3_enable_shared_cache $::enable_shared_cache
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finish_test
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