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Annotation of embedaddon/sqlite3/test/lock4.test, revision 1.1.1.1

1.1       misho       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: 
                     17: set testdir [file dirname $argv0]
                     18: source $testdir/tester.tcl
                     19: 
                     20: do_not_use_codec
                     21: 
                     22: # Initialize the test.db database so that it is non-empty
                     23: #
                     24: do_test lock4-1.1 {
                     25:   db eval {
                     26:      PRAGMA auto_vacuum=OFF;
                     27:      CREATE TABLE t1(x);
                     28:   }
                     29:   forcedelete test2.db test2.db-journal
                     30:   sqlite3 db2 test2.db
                     31:   db2 eval {
                     32:      PRAGMA auto_vacuum=OFF;
                     33:      CREATE TABLE t2(x)
                     34:   }
                     35:   db2 close
                     36:   list [file size test.db] [file size test2.db]
                     37: } {2048 2048}
                     38: 
                     39: # Create a script to drive a separate process that will
                     40: #
                     41: #     1.  Create a second database test2.db
                     42: #     2.  Get an exclusive lock on test2.db
                     43: #     3.  Add an entry to test.db in table t1, waiting as necessary.
                     44: #     4.  Commit the change to test2.db.
                     45: #
                     46: # Meanwhile, this process will:
                     47: # 
                     48: #     A.  Get an exclusive lock on test.db
                     49: #     B.  Attempt to read from test2.db but get an SQLITE_BUSY error.
                     50: #     C.  Commit the changes to test.db thus alloing the other process
                     51: #         to continue.
                     52: #
                     53: do_test lock4-1.2 {
                     54:  
                     55:   # Create a script for the second process to run.
                     56:   #
                     57:   set out [open test2-script.tcl w]
                     58:   puts $out "sqlite3_test_control_pending_byte [set sqlite_pending_byte]"
                     59:   puts $out {
                     60:      sqlite3 db2 test2.db
                     61:      db2 eval {
                     62:         BEGIN;
                     63:         INSERT INTO t2 VALUES(2);
                     64:      }
                     65:      sqlite3 db test.db
                     66:      db timeout 1000000
                     67:      db eval {
                     68:         INSERT INTO t1 VALUES(2);
                     69:      }
                     70:      db close
                     71:      db2 eval COMMIT
                     72:      exit
                     73:   }
                     74:   close $out
                     75: 
                     76:   # Begin a transaction on test.db.
                     77:   db eval {
                     78:      BEGIN EXCLUSIVE;
                     79:      INSERT INTO t1 VALUES(1);
                     80:   }
                     81: 
                     82:   # Kick off the second process.
                     83:   exec [info nameofexec] ./test2-script.tcl &
                     84: 
                     85:   # Wait until the second process has started its transaction on test2.db.
                     86:   while {![file exists test2.db-journal]} {
                     87:     after 10
                     88:   }
                     89: 
                     90:   # Try to write to test2.db. We are locked out.
                     91:   sqlite3 db2 test2.db
                     92:   catchsql {
                     93:     INSERT INTO t2 VALUES(1)
                     94:   } db2
                     95: } {1 {database is locked}}
                     96: do_test lock4-1.3 {
                     97:   db eval {
                     98:      COMMIT;
                     99:   }
                    100:   while {[file exists test2.db-journal]} {
                    101:     after 10
                    102:   }
                    103:   # The other process has committed its transaction on test2.db by 
                    104:   # deleting the journal file. But it might retain the lock for a 
                    105:   # fraction longer 
                    106:   #
                    107:   after 25
                    108:   db2 eval {
                    109:      SELECT * FROM t2
                    110:   }
                    111: } {2}
                    112: 
                    113:     
                    114: do_test lock4-999.1 {
                    115:   rename db2 {}
                    116: } {}
                    117: 
                    118: finish_test