xref: /sqlite-3.40.0/test/lock4.test (revision 69aedc8d) 
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 1.10 2009/05/06 00:52:41 drh Exp $
15
16
17set testdir [file dirname $argv0]
18source $testdir/tester.tcl
19
20if {[atomic_batch_write test.db]} {
21  # This test uses two processes, one of which blocks until the other
22  # creates a *-journal file. Which doesn't work if atomic writes are
23  # available.
24  finish_test
25  return
26}
27
28do_not_use_codec
29
30# Initialize the test.db database so that it is non-empty
31#
32do_test lock4-1.1 {
33  db eval {
34     PRAGMA auto_vacuum=OFF;
35     CREATE TABLE t1(x);
36  }
37  forcedelete test2.db test2.db-journal
38  sqlite3 db2 test2.db
39  db2 eval {
40     PRAGMA auto_vacuum=OFF;
41     CREATE TABLE t2(x)
42  }
43  db2 close
44  list [file size test.db] [file size test2.db]
45} {2048 2048}
46
47# Create a script to drive a separate process that will
48#
49#     1.  Create a second database test2.db
50#     2.  Get an exclusive lock on test2.db
51#     3.  Add an entry to test.db in table t1, waiting as necessary.
52#     4.  Commit the change to test2.db.
53#
54# Meanwhile, this process will:
55#
56#     A.  Get an exclusive lock on test.db
57#     B.  Attempt to read from test2.db but get an SQLITE_BUSY error.
58#     C.  Commit the changes to test.db thus alloing the other process
59#         to continue.
60#
61do_test lock4-1.2 {
62
63  # Create a script for the second process to run.
64  #
65  set out [open test2-script.tcl w]
66  puts $out "sqlite3_test_control_pending_byte [set sqlite_pending_byte]"
67  puts $out {
68     sqlite3 db2 test2.db
69     db2 eval {
70        BEGIN;
71        INSERT INTO t2 VALUES(2);
72     }
73     sqlite3 db test.db
74     db timeout 1000000
75     db eval {
76        INSERT INTO t1 VALUES(2);
77     }
78     db close
79     db2 eval COMMIT
80     exit
81  }
82  close $out
83
84  # Begin a transaction on test.db.
85  db eval {
86     BEGIN EXCLUSIVE;
87     INSERT INTO t1 VALUES(1);
88  }
89
90  # Kick off the second process.
91  exec [info nameofexec] ./test2-script.tcl &
92
93  # Wait until the second process has started its transaction on test2.db.
94  while {![file exists test2.db-journal]} {
95    after 10
96  }
97
98  # Try to write to test2.db. We are locked out.
99  sqlite3 db2 test2.db
100  catchsql {
101    INSERT INTO t2 VALUES(1)
102  } db2
103} {1 {database is locked}}
104do_test lock4-1.3 {
105  db eval {
106     COMMIT;
107  }
108  while {[file exists test2.db-journal]} {
109    after 10
110  }
111  # The other process has committed its transaction on test2.db by
112  # deleting the journal file. But it might retain the lock for a
113  # fraction longer
114  #
115  after 25
116  db2 eval {
117     SELECT * FROM t2
118  }
119} {2}
120
121
122do_test lock4-999.1 {
123  rename db2 {}
124} {}
125
126finish_test
127