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| 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 |
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