SQLite

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.146 2004/01/15 13:29:32 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information

*/
static int sqliteDefaultBusyCallback(
 void *Timeout,           /* Maximum amount of time to wait */
 const char *NotUsed,     /* The name of the table that is busy */
 int count                /* Number of times table has been busy */
){
#if SQLITE_MIN_SLEEP_MS==1
  static const char delays[] =
     { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50,  50, 100};
  static const short int totals[] =
     { 0, 1, 3,  8, 18, 33, 53, 78, 103, 128, 178, 228, 287};
# define NDELAY (sizeof(delays)/sizeof(delays[0]))
  int timeout = (int)Timeout;
  int delay, prior;

  if( count <= NDELAY ){

    delay = delays[count-1];
    prior = totals[count-1];
  }else{
    delay = delays[NDELAY-1];
    prior = totals[NDELAY-1] + delay*(count-NDELAY-1);

  }

  if( prior + delay > timeout ){
    delay = timeout - prior;
    if( delay<=0 ) return 0;
  }
  sqliteOsSleep(delay);
  return 1;
#else
  int timeout = (int)Timeout;
  if( (count+1)*1000 > timeout ){

# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is database locks.
#
# $Id: lock.test,v 1.19 2004/01/15 13:29:40 drh Exp $


set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Create an alternative connection to the database
#

  set ::callback_value {}
  db2 busy callback
  set r [catch {execsql {BEGIN TRANSACTION} db2} msg]
  execsql {ROLLBACK} db2
  lappend r $msg
  lappend r $::callback_value
} {0 {} {1 2 3}}

# Test the built-in busy timeout handler
#
do_test lock-2.8 {
  db2 timeout 400
  execsql BEGIN
  catchsql BEGIN db2
} {1 {database is locked}}
do_test lock-2.9 {
  db2 timeout 0
  execsql COMMIT
} {}
integrity_check lock-2.10

# Try to start two transactions in a row
#
do_test lock-3.1 {
  execsql {BEGIN TRANSACTION}
  set r [catch {execsql {BEGIN TRANSACTION}} msg]
  execsql {ROLLBACK}