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80 lines
2.1 KiB
Text
80 lines
2.1 KiB
Text
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# 2009 February 26
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# $Id: thread004.test,v 1.3 2009/06/05 17:09:12 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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if {[run_thread_tests]==0} { finish_test ; return }
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ifcapable !shared_cache {
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finish_test
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return
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}
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if { [info commands sqlite3_table_column_metadata] eq "" } {
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finish_test
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return
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}
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# Use shared-cache mode for this test.
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#
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db close
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set ::enable_shared_cache [sqlite3_enable_shared_cache]
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sqlite3_enable_shared_cache 1
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# Create a table in database test.db
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#
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sqlite3 db test.db
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do_test thread004-1.1 {
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execsql { CREATE TABLE t1(a, b, c) }
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} {}
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do_test thread004-1.2 {
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set ThreadOne {
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set iStart [clock_seconds]
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while {[clock_seconds]<$iStart+20} {
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set ::DB [sqlite3_open test.db]
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sqlite3_close $::DB
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}
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}
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set ThreadTwo {
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set ::DB [sqlite3_open test.db]
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set iStart [clock_seconds]
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set nErr 0
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while {[clock_seconds] <$iStart+20} {
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incr nErr [catch {sqlite3_table_column_metadata $::DB main t1 a}]
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}
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sqlite3_close $::DB
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set nErr
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}
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# Run two threads. The first thread opens and closes database test.db
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# repeatedly. Each time this happens, the in-memory schema used by
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# all connections to test.db is discarded.
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#
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# The second thread calls sqlite3_table_column_metadata() over and
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# over again. Each time it is called, the database schema is loaded
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# if it is not already in memory. At one point this was crashing.
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#
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unset -nocomplain finished
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thread_spawn finished(1) $thread_procs $ThreadOne
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thread_spawn finished(2) $thread_procs $ThreadTwo
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foreach t {1 2} {
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if {![info exists finished($t)]} { vwait finished($t) }
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}
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set finished(2)
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} {0}
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sqlite3_enable_shared_cache $::enable_shared_cache
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finish_test
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