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sqlite3

    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 1.1.1.1 2012/02/21 17:04:16 misho 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