hallock.c

来自「一个免费的SMART CARD OS系统。」· C语言 代码 · 共 85 行

/* ============================================================================
   Project Name : jayaCard
   Module Name  : proto/hal/<template>/hallock.c
   Version : $Id: hallock.c,v 1.7 2004/01/11 09:56:33 dgil Exp $

	Description: Locks

    The Original Code is jayaCard code.

    The Initial Developer of the Original Code is Gilles Dumortier.

    Portions created by the Initial Developer are Copyright (C) 2002-2004 the
    Initial Developer. All Rights Reserved.

    Contributor(s):

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; see http://www.gnu.org/licenses/gpl.html

   History Rev	Description
   041603 dgil	wrote it from scratch
   ============================================================================
*/

#include "precomp.h"

/* =========================================================================
	__hal_lock()

	returns a lock (LOCK_UNSET == unset; otherwise set)

	secure: use the global semaphore
   ========================================================================= */

jbyte __hal_lock(jbyte LockNum)
{
	LOCAL(jbyte,byLock);

	/* read the lock */
	gGlobalSem++;

	/* check the lock */
	gGlobalSem++;

	/* return the lock unset or not */
	LOG1("HAL","__hal_lock() returns 0x%.2X",byLock);
	return byLock;
}

/* =========================================================================
	__hal_setlock()

	Set a lock

	secure: use the global semaphore
   ========================================================================= */

void __hal_setlock(jbyte LockNum)
{
	/* set the lock */
	gGlobalSem++;

	/* re-read the lock to be sure no more unset */
	if (HAL_LOCK(LockNum)==LOCK_UNSET) {
		/* __x under attack */
		HAL_HALT();
		return;
	}
	gGlobalSem--;
}

/* =========================================================================
	That's all folks !
   ========================================================================= */