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Annotation of embedaddon/sqlite3/test/tkt3793.test, revision 1.1

1.1     ! misho       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: ifcapable threadsafe {
        !           104:   set ::busyconnection db1
        !           105:   db1 eval {SELECT * FROM t2 ORDER BY a LIMIT 20} {
        !           106:     do_test tkt3793-2.[incr x] { set ::busyconnection } db1
        !           107:     set ::busyconnection db2
        !           108:   
        !           109:     db2 eval { SELECT count(*) FROM t2 }
        !           110:     do_test tkt3793-2.[incr x] { set ::busyconnection } db2
        !           111:     set ::busyconnection db1
        !           112:   }
        !           113: }
        !           114:   
        !           115: do_test tkt3793-3 {
        !           116:   db1 close
        !           117:   db2 close
        !           118: } {}
        !           119: 
        !           120: sqlite3_enable_shared_cache $::enable_shared_cache
        !           121: finish_test