blob: b2adc460d008a85446bab42c65e7643a70a78fde (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
# 2009 February 26
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
#
# $Id: thread004.test,v 1.3 2009/06/05 17:09:12 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
if {[run_thread_tests]==0} { finish_test ; return }
ifcapable !shared_cache {
finish_test
return
}
if { [info commands sqlite3_table_column_metadata] eq "" } {
finish_test
return
}
# Use shared-cache mode for this test.
#
db close
set ::enable_shared_cache [sqlite3_enable_shared_cache]
sqlite3_enable_shared_cache 1
# Create a table in database test.db
#
sqlite3 db test.db
do_test thread004-1.1 {
execsql { CREATE TABLE t1(a, b, c) }
} {}
do_test thread004-1.2 {
set ThreadOne {
set iStart [clock_seconds]
while {[clock_seconds]<$iStart+20} {
set ::DB [sqlite3_open test.db]
sqlite3_close $::DB
}
}
set ThreadTwo {
set ::DB [sqlite3_open test.db]
set iStart [clock_seconds]
set nErr 0
while {[clock_seconds] <$iStart+20} {
incr nErr [catch {sqlite3_table_column_metadata $::DB main t1 a}]
}
sqlite3_close $::DB
set nErr
}
# Run two threads. The first thread opens and closes database test.db
# repeatedly. Each time this happens, the in-memory schema used by
# all connections to test.db is discarded.
#
# The second thread calls sqlite3_table_column_metadata() over and
# over again. Each time it is called, the database schema is loaded
# if it is not already in memory. At one point this was crashing.
#
unset -nocomplain finished
thread_spawn finished(1) $thread_procs $ThreadOne
thread_spawn finished(2) $thread_procs $ThreadTwo
foreach t {1 2} {
if {![info exists finished($t)]} { vwait finished($t) }
}
set finished(2)
} {0}
sqlite3_enable_shared_cache $::enable_shared_cache
finish_test
|
