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Annotation of embedaddon/sqlite3/test/tkt3793.test, revision 1.1.1.1

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