sl@0: # 2007 April 6
sl@0: #
sl@0: # The author disclaims copyright to this source code.  In place of
sl@0: # a legal notice, here is a blessing:
sl@0: #
sl@0: #    May you do good and not evil.
sl@0: #    May you find forgiveness for yourself and forgive others.
sl@0: #    May you share freely, never taking more than you give.
sl@0: #
sl@0: #***********************************************************************
sl@0: # This file implements regression tests for SQLite library.  The
sl@0: # focus of this script is database locks.
sl@0: #
sl@0: # $Id: lock4.test,v 1.8 2008/03/14 08:57:42 danielk1977 Exp $
sl@0: 
sl@0: 
sl@0: set testdir [file dirname $argv0]
sl@0: source $testdir/tester.tcl
sl@0: 
sl@0: # Initialize the test.db database so that it is non-empty
sl@0: #
sl@0: do_test lock4-1.1 {
sl@0:   db eval {
sl@0:      PRAGMA auto_vacuum=OFF;
sl@0:      CREATE TABLE t1(x);
sl@0:   }
sl@0:   file delete -force test2.db test2.db-journal
sl@0:   sqlite3 db2 test2.db
sl@0:   db2 eval {
sl@0:      PRAGMA auto_vacuum=OFF;
sl@0:      CREATE TABLE t2(x)
sl@0:   }
sl@0:   db2 close
sl@0:   list [file size test.db] [file size test2.db]
sl@0: } {2048 2048}
sl@0: 
sl@0: # Create a script to drive a separate process that will
sl@0: #
sl@0: #     1.  Create a second database test2.db
sl@0: #     2.  Get an exclusive lock on test2.db
sl@0: #     3.  Add an entry to test.db in table t1, waiting as necessary.
sl@0: #     4.  Commit the change to test2.db.
sl@0: #
sl@0: # Meanwhile, this process will:
sl@0: # 
sl@0: #     A.  Get an exclusive lock on test.db
sl@0: #     B.  Attempt to read from test2.db but get an SQLITE_BUSY error.
sl@0: #     C.  Commit the changes to test.db thus alloing the other process
sl@0: #         to continue.
sl@0: #
sl@0: do_test lock4-1.2 {
sl@0:  
sl@0:   # Create a script for the second process to run.
sl@0:   #
sl@0:   set out [open test2-script.tcl w]
sl@0:   puts $out "set sqlite_pending_byte [set sqlite_pending_byte]"
sl@0:   puts $out {
sl@0:      sqlite3 db2 test2.db
sl@0:      db2 eval {
sl@0:         BEGIN;
sl@0:         INSERT INTO t2 VALUES(2);
sl@0:      }
sl@0:      sqlite3 db test.db
sl@0:      db timeout 1000000
sl@0:      db eval {
sl@0:         INSERT INTO t1 VALUES(2);
sl@0:      }
sl@0:      db close
sl@0:      db2 eval COMMIT
sl@0:      exit
sl@0:   }
sl@0:   close $out
sl@0: 
sl@0:   # Begin a transaction on test.db.
sl@0:   db eval {
sl@0:      BEGIN EXCLUSIVE;
sl@0:      INSERT INTO t1 VALUES(1);
sl@0:   }
sl@0: 
sl@0:   # Kick off the second process.
sl@0:   exec [info nameofexec] ./test2-script.tcl &
sl@0: 
sl@0:   # Wait until the second process has started its transaction on test2.db.
sl@0:   while {![file exists test2.db-journal]} {
sl@0:     after 10
sl@0:   }
sl@0: 
sl@0:   # Try to write to test2.db. We are locked out.
sl@0:   sqlite3 db2 test2.db
sl@0:   catchsql {
sl@0:     INSERT INTO t2 VALUES(1)
sl@0:   } db2
sl@0: } {1 {database is locked}}
sl@0: do_test lock4-1.3 {
sl@0:   db eval {
sl@0:      COMMIT;
sl@0:   }
sl@0:   while {[file exists test2.db-journal]} {
sl@0:     after 10
sl@0:   }
sl@0:   # The other process has committed its transaction on test2.db by 
sl@0:   # deleting the journal file. But it might retain the lock for a 
sl@0:   # fraction longer 
sl@0:   #
sl@0:   db2 eval {
sl@0:      SELECT * FROM t2
sl@0:   }
sl@0: } {2}
sl@0: 
sl@0:     
sl@0: do_test lock4-999.1 {
sl@0:   rename db2 {}
sl@0: } {}
sl@0: 
sl@0: finish_test