xref: /sqlite-3.40.0/test/lock4.test (revision 8a29dfde) 
1# 2007 April 6
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.  The
12# focus of this script is database locks.
13#
14# $Id: lock4.test,v 1.8 2008/03/14 08:57:42 danielk1977 Exp $
15
16
17set testdir [file dirname $argv0]
18source $testdir/tester.tcl
19
20# Initialize the test.db database so that it is non-empty
21#
22do_test lock4-1.1 {
23  db eval {
24     PRAGMA auto_vacuum=OFF;
25     CREATE TABLE t1(x);
26  }
27  file delete -force test2.db test2.db-journal
28  sqlite3 db2 test2.db
29  db2 eval {
30     PRAGMA auto_vacuum=OFF;
31     CREATE TABLE t2(x)
32  }
33  db2 close
34  list [file size test.db] [file size test2.db]
35} {2048 2048}
36
37# Create a script to drive a separate process that will
38#
39#     1.  Create a second database test2.db
40#     2.  Get an exclusive lock on test2.db
41#     3.  Add an entry to test.db in table t1, waiting as necessary.
42#     4.  Commit the change to test2.db.
43#
44# Meanwhile, this process will:
45#
46#     A.  Get an exclusive lock on test.db
47#     B.  Attempt to read from test2.db but get an SQLITE_BUSY error.
48#     C.  Commit the changes to test.db thus alloing the other process
49#         to continue.
50#
51do_test lock4-1.2 {
52
53  # Create a script for the second process to run.
54  #
55  set out [open test2-script.tcl w]
56  puts $out "set sqlite_pending_byte [set sqlite_pending_byte]"
57  puts $out {
58     sqlite3 db2 test2.db
59     db2 eval {
60        BEGIN;
61        INSERT INTO t2 VALUES(2);
62     }
63     sqlite3 db test.db
64     db timeout 1000000
65     db eval {
66        INSERT INTO t1 VALUES(2);
67     }
68     db close
69     db2 eval COMMIT
70     exit
71  }
72  close $out
73
74  # Begin a transaction on test.db.
75  db eval {
76     BEGIN EXCLUSIVE;
77     INSERT INTO t1 VALUES(1);
78  }
79
80  # Kick off the second process.
81  exec [info nameofexec] ./test2-script.tcl &
82
83  # Wait until the second process has started its transaction on test2.db.
84  while {![file exists test2.db-journal]} {
85    after 10
86  }
87
88  # Try to write to test2.db. We are locked out.
89  sqlite3 db2 test2.db
90  catchsql {
91    INSERT INTO t2 VALUES(1)
92  } db2
93} {1 {database is locked}}
94do_test lock4-1.3 {
95  db eval {
96     COMMIT;
97  }
98  while {[file exists test2.db-journal]} {
99    after 10
100  }
101  # The other process has committed its transaction on test2.db by
102  # deleting the journal file. But it might retain the lock for a
103  # fraction longer
104  #
105  db2 eval {
106     SELECT * FROM t2
107  }
108} {2}
109
110
111do_test lock4-999.1 {
112  rename db2 {}
113} {}
114
115finish_test
116