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 # $Id: tkt3793.test,v 1.2 2009/06/01 16:42:18 shane Exp $ 17 18 19 set testdir [file dirname $argv0] 20 source $testdir/tester.tcl 21 22 ifcapable !shared_cache||!attach { 23 finish_test 24 return 25 } 26 set ::enable_shared_cache [sqlite3_enable_shared_cache 1] 27 28 do_test tkt3793-1.1 { 29 # This is taken from shared.test. The Windows VFS expands 30 # ./test.db (and test.db) to be the same thing so the path 31 # matches and they share a cache. By changing the case 32 # for Windows platform, we get around this and get a separate 33 # connection. 34 if {$::tcl_platform(platform)=="unix"} { 35 sqlite3 db1 test.db 36 sqlite3 db2 test.db 37 } else { 38 sqlite3 db1 TEST.DB 39 sqlite3 db2 TEST.DB 40 } 41 execsql { 42 BEGIN; 43 CREATE TABLE t1(a, b); 44 CREATE TABLE t2(a PRIMARY KEY, b); 45 INSERT INTO t1 VALUES(randstr(50,50), randstr(50,50)); 46 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 47 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 48 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 49 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 50 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 51 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 52 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 53 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 54 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 55 INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; 56 INSERT INTO t2 SELECT * FROM t1; 57 COMMIT; 58 } 59 } {} 60 61 proc busyhandler {db args} { set ::busyconnection $db ; return 1 } 62 db2 busy {busyhandler db2} 63 db1 busy {busyhandler db1} 64 65 # Establish a read-lock on the database file using connection [db]. 66 # 67 do_test tkt3793-1.2 { 68 execsql { 69 BEGIN; 70 SELECT count(*) FROM t1; 71 } 72 } {1024} 73 74 # Set the size of the cache shared by [db1] and [db2] to 10. Then update 75 # more than 10 pages of table t1. At this point the shared-cache will 76 # hold a RESERVED lock on the database file. Even though there are now 77 # more than 10 dirty pages in memory, it cannot upgrade to an EXCLUSIVE 78 # lock because of the read-lock held by [db]. 79 # 80 do_test tkt3793-1.3 { 81 execsql { 82 PRAGMA cache_size = 10; 83 BEGIN; 84 UPDATE t1 SET b = randstr(50,50); 85 } db1 86 } {} 87 88 set x 0 89 90 # Run one SELECT query on the shared-cache using [db1], then from within 91 # the callback run another via [db2]. Because of the large number of dirty 92 # pages within the cache, each time a new page is read from the database 93 # SQLite will attempt to upgrade to an EXCLUSIVE lock, and hence invoke 94 # the busy-handler. The tests here verify that the correct busy-handler 95 # function is invoked (the busy-handler associated with the database 96 # connection that called sqlite3_step()). When bug #3793 existed, sometimes 97 # the [db2] busy-handler was invoked from within the call to sqlite3_step() 98 # associated with [db1]. 99 # 100 # Note: Before the bug was fixed, if [db2] was opened with the "-fullmutex 1" 101 # option, then this test case would cause an assert() to fail. 102 # 103 set ::busyconnection db1 104 db1 eval {SELECT * FROM t2 ORDER BY a LIMIT 20} { 105 do_test tkt3793-2.[incr x] { set ::busyconnection } db1 106 set ::busyconnection db2 107 108 db2 eval { SELECT count(*) FROM t2 } 109 do_test tkt3793-2.[incr x] { set ::busyconnection } db2 110 set ::busyconnection db1 111 } 112 113 do_test tkt3793-3 { 114 db1 close 115 db2 close 116 } {} 117 118 sqlite3_enable_shared_cache $::enable_shared_cache 119 finish_test 120
