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Annotation of embedaddon/sqlite3/test/thread004.test, revision 1.1

1.1     ! misho       1: # 2009 February 26
        !             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: #
        !            12: # $Id: thread004.test,v 1.3 2009/06/05 17:09:12 drh Exp $
        !            13: 
        !            14: set testdir [file dirname $argv0]
        !            15: 
        !            16: source $testdir/tester.tcl
        !            17: if {[run_thread_tests]==0} { finish_test ; return }
        !            18: ifcapable !shared_cache {
        !            19:   finish_test
        !            20:   return
        !            21: }
        !            22: if { [info commands sqlite3_table_column_metadata] eq "" } {
        !            23:   finish_test
        !            24:   return
        !            25: }
        !            26: 
        !            27: # Use shared-cache mode for this test.
        !            28: # 
        !            29: db close
        !            30: set ::enable_shared_cache [sqlite3_enable_shared_cache]
        !            31: sqlite3_enable_shared_cache 1
        !            32: 
        !            33: # Create a table in database test.db
        !            34: #
        !            35: sqlite3 db test.db
        !            36: do_test thread004-1.1 {
        !            37:   execsql { CREATE TABLE t1(a, b, c) }
        !            38: } {}
        !            39: 
        !            40: do_test thread004-1.2 {
        !            41: 
        !            42:   set ThreadOne {
        !            43:     set iStart [clock_seconds]
        !            44:     while {[clock_seconds]<$iStart+20} {
        !            45:       set ::DB [sqlite3_open test.db]
        !            46:       sqlite3_close $::DB
        !            47:     }
        !            48:   }
        !            49:   set ThreadTwo {
        !            50:     set ::DB [sqlite3_open test.db]
        !            51:     set iStart [clock_seconds]
        !            52:     set nErr 0
        !            53:     while {[clock_seconds] <$iStart+20} {
        !            54:       incr nErr [catch {sqlite3_table_column_metadata $::DB main t1 a}]
        !            55:     }
        !            56:     sqlite3_close $::DB
        !            57:     set nErr
        !            58:   }
        !            59:   
        !            60:   # Run two threads. The first thread opens and closes database test.db
        !            61:   # repeatedly. Each time this happens, the in-memory schema used by
        !            62:   # all connections to test.db is discarded.
        !            63:   #
        !            64:   # The second thread calls sqlite3_table_column_metadata() over and
        !            65:   # over again. Each time it is called, the database schema is loaded
        !            66:   # if it is not already in memory. At one point this was crashing.
        !            67:   #
        !            68:   unset -nocomplain finished
        !            69:   thread_spawn finished(1) $thread_procs $ThreadOne
        !            70:   thread_spawn finished(2) $thread_procs $ThreadTwo
        !            71:   
        !            72:   foreach t {1 2} {
        !            73:     if {![info exists finished($t)]} { vwait finished($t) }
        !            74:   }
        !            75: 
        !            76:   set finished(2)
        !            77: } {0}
        !            78: sqlite3_enable_shared_cache $::enable_shared_cache
        !            79: finish_test