SQLite

    }
  }

  Tcl_ResetResult(interp);
  return TCL_OK;
}

#if SQLITE_OS_WIN
/*
** Information passed from the main thread into the windows file locker
** background thread.
*/
struct win32FileLocker {
  HANDLE h;           /* Handle of the file to be locked */
  int delay1;         /* Delay before locking */
  int delay2;         /* Delay before unlocking */
  int ok;             /* Finished ok */
  int err;            /* True if an error occurs */
};
#endif


#if SQLITE_OS_WIN
/*
** The background thread that does file locking.
*/
static void win32_file_locker(void *pAppData){
  struct win32FileLocker *p = (struct win32FileLocker*)pAppData;
  if( p->delay1 ) Sleep(p->delay1);
  if( LockFile(p->h, 0, 0, 100000000, 0) ){
    Sleep(p->delay2);
    UnlockFile(p->h, 0, 0, 100000000, 0);
    p->ok = 1;
  }else{
    p->err = 1;
  }
  CloseHandle(p->h);
  p->h = 0;
  p->delay1 = 0;
  p->delay2 = 0;
}
#endif

#if SQLITE_OS_WIN
/*
**      lock_win32_file FILENAME DELAY1 DELAY2
**
** Get an exclusive manditory lock on file for DELAY2 milliseconds.
** Wait DELAY1 milliseconds before acquiring the lock.
*/
static int win32_file_lock(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  static struct win32FileLocker x = { 0, 0, 0 };
  const char *zFilename;
  int retry = 0;
  
  if( objc!=4 && objc!=1 ){
    Tcl_WrongNumArgs(interp, 1, objv, "FILENAME DELAY1 DELAY2");
    return TCL_ERROR;
  }
  if( objc==1 ){
    char zBuf[200];
    sqlite3_snprintf(sizeof(zBuf), zBuf, "%d %d %d %d %d",
                     x.ok, x.err, x.delay1, x.delay2, x.h);
    Tcl_AppendResult(interp, zBuf, (char*)0);
    return TCL_OK;
  }
  while( x.h && retry<10 ){
    retry++;
    Sleep(100);
  }
  if( x.h ){
    Tcl_AppendResult(interp, "busy", (char*)0);
    return TCL_ERROR;
  }
  if( Tcl_GetIntFromObj(interp, objv[2], &x.delay1) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[3], &x.delay2) ) return TCL_ERROR;
  zFilename = Tcl_GetString(objv[1]);
  x.h = CreateFile(zFilename, GENERIC_READ|GENERIC_WRITE,
              FILE_SHARE_READ|FILE_SHARE_WRITE, 0, OPEN_ALWAYS,
              FILE_ATTRIBUTE_NORMAL, 0);
  if( !x.h ){
    Tcl_AppendResult(interp, "cannot open file: ", zFilename, (char*)0);
    return TCL_ERROR;
  }
  _beginthread(win32_file_locker, 0, (void*)&x);
  Sleep(0);
  return TCL_OK;
}
#endif

/*
**      optimization_control DB OPT BOOLEAN
**
** Enable or disable query optimizations using the sqlite3_test_control()
** interface.  Disable if BOOLEAN is false and enable if BOOLEAN is true.
** OPT is the name of the optimization to be disabled.

     { "sqlite3_extended_result_codes", test_extended_result_codes, 0},
     { "sqlite3_limit",                 test_limit,                 0},

     { "save_prng_state",               save_prng_state,    0 },
     { "restore_prng_state",            restore_prng_state, 0 },
     { "reset_prng_state",              reset_prng_state,   0 },
     { "optimization_control",          optimization_control,0},
#if SQLITE_OS_WIN
     { "lock_win32_file",               win32_file_lock,    0 },
#endif
     { "tcl_objproc",                   runAsObjProc,       0 },

     /* sqlite3_column_*() API */
     { "sqlite3_column_count",          test_column_count  ,0 },
     { "sqlite3_data_count",            test_data_count    ,0 },
     { "sqlite3_column_type",           test_column_type   ,0 },
     { "sqlite3_column_blob",           test_column_blob   ,0 },

# 2011 July 11
#
# 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 recovery from transient manditory locks
# that sometimes appear on database files due to anti-virus software.
#

if {$tcl_platform(platform)!="windows"} return

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

set testprefix win32lock

do_test win32lock-1.1 {
  db eval {
    PRAGMA cache_size=10;
    CREATE TABLE t1(x,y);
    INSERT INTO t1 VALUES(1,randomblob(100000));
    INSERT INTO t1 VALUES(2,randomblob(50000));
    INSERT INTO t1 VALUES(3,randomblob(25000));
    INSERT INTO t1 VALUES(4,randomblob(12500));
    SELECT x, length(y) FROM t1 ORDER BY rowid;
  }
} {1 100000 2 50000 3 25000 4 12500}

unset -nocomplain delay1 rc msg
set delay1 50
set rc 0
set old_pending_byte [sqlite3_test_control_pending_byte 0x40000000]
while {1} {
  sqlite3_sleep 10
  lock_win32_file test.db 0 $::delay1
  set rc [catch {db eval {SELECT x, length(y) FROM t1 ORDER BY rowid}} msg]
  if {$rc} {
    do_test win32lock-1.2-$delay1-fin {
       set ::msg
    } {disk I/O error}
    break
  } else {
    do_test win32lock-1.2-$delay1 {
       set ::msg
    } {1 100000 2 50000 3 25000 4 12500}
    incr delay1 50
  }
}
sqlite3_test_control_pending_byte $old_pending_byte

finish_test