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