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