AryaWu/sqlite

1# 2007 April 62#3# The author disclaims copyright to this source code.  In place of4# 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.  The12# 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.tcl19 20if {[atomic_batch_write test.db]} {21  # This test uses two processes, one of which blocks until the other22  # creates a *-journal file. Which doesn't work if atomic writes are23  # available.24  finish_test25  return26}27 28do_not_use_codec29 30# Initialize the test.db database so that it is non-empty31#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-journal38  sqlite3 db2 test2.db39  db2 eval {40     PRAGMA auto_vacuum=OFF;41     CREATE TABLE t2(x)42  }43  db2 close44  list [file size test.db] [file size test2.db]45} {2048 2048}46 47# Create a script to drive a separate process that will48#49#     1.  Create a second database test2.db50#     2.  Get an exclusive lock on test2.db51#     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.db57#     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 process59#         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.db69     db2 eval {70        BEGIN;71        INSERT INTO t2 VALUES(2);72     }73     sqlite3 db test.db74     db timeout 100000075     db eval {76        INSERT INTO t1 VALUES(2);77     }78     db close79     db2 eval COMMIT80     exit81  }82  close $out83 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 1096  }97 98  # Try to write to test2.db. We are locked out.99  sqlite3 db2 test2.db100  catchsql {101    INSERT INTO t2 VALUES(1)102  } db2103} {1 {database is locked}}104do_test lock4-1.3 {105  db eval {106     COMMIT;107  }108  while {[file exists test2.db-journal]} {109    after 10110  }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 25116  db2 eval {117     SELECT * FROM t2118  }119} {2}120 121    122do_test lock4-999.1 {123  rename db2 {}124} {}125 126finish_test127