1# 2009 April 10 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# This file implements regression tests for SQLite library. 12# 13# This file implements tests to verify that ticket #3793 has been 14# fixed. 15# 16 17 18set testdir [file dirname $argv0] 19source $testdir/tester.tcl 20 21ifcapable !shared_cache||!attach { 22 finish_test 23 return 24} 25set ::enable_shared_cache [sqlite3_enable_shared_cache 1] 26 27do_test tkt3793-1.1 { 28 db close 29 sqlite3 db "file:test.db" -uri 1 30 sqlite3 db1 "file:test.db?cache=private" -uri 1 31 sqlite3 db2 "file:test.db?cache=shared" -uri 1 32 execsql { 33 BEGIN; 34 CREATE TABLE t1(a, b); 35 CREATE TABLE t2(a PRIMARY KEY, b); 36 INSERT INTO t1 VALUES(randstr(50,50), randstr(50,50)); 37 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 38 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 39 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 40 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 41 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 42 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 43 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 44 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 45 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 46 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 47 INSERT INTO t2 SELECT * FROM t1; 48 COMMIT; 49 } 50} {} 51 52proc busyhandler {db args} { set ::busyconnection $db ; return 1 } 53db2 busy {busyhandler db2} 54db1 busy {busyhandler db1} 55 56# Establish a read-lock on the database file using connection [db]. 57# 58do_test tkt3793-1.2 { 59 execsql { 60 BEGIN; 61 SELECT count(*) FROM t1; 62 } 63} {1024} 64 65# Set the size of the cache shared by [db1] and [db2] to 10. Then update 66# more than 10 pages of table t1. At this point the shared-cache will 67# hold a RESERVED lock on the database file. Even though there are now 68# more than 10 dirty pages in memory, it cannot upgrade to an EXCLUSIVE 69# lock because of the read-lock held by [db]. 70# 71do_test tkt3793-1.3 { 72 execsql { 73 PRAGMA cache_size = 10; 74 BEGIN; 75 UPDATE t1 SET b = randstr(50,50); 76 } db1 77} {} 78 79set x 0 80 81# Run one SELECT query on the shared-cache using [db1], then from within 82# the callback run another via [db2]. Because of the large number of dirty 83# pages within the cache, each time a new page is read from the database 84# SQLite will attempt to upgrade to an EXCLUSIVE lock, and hence invoke 85# the busy-handler. The tests here verify that the correct busy-handler 86# function is invoked (the busy-handler associated with the database 87# connection that called sqlite3_step()). When bug #3793 existed, sometimes 88# the [db2] busy-handler was invoked from within the call to sqlite3_step() 89# associated with [db1]. 90# 91# Note: Before the bug was fixed, if [db2] was opened with the "-fullmutex 1" 92# option, then this test case would cause an assert() to fail. 93# 94ifcapable threadsafe { 95 set ::busyconnection db1 96 db1 eval {SELECT * FROM t2 ORDER BY a LIMIT 20} { 97 do_test tkt3793-2.[incr x] { set ::busyconnection } db1 98 set ::busyconnection db2 99 100 db2 eval { SELECT count(*) FROM t2 } 101 do_test tkt3793-2.[incr x] { set ::busyconnection } db2 102 set ::busyconnection db1 103 } 104} 105 106do_test tkt3793-3 { 107 db1 close 108 db2 close 109} {} 110 111sqlite3_enable_shared_cache $::enable_shared_cache 112finish_test 113