/*

 * Copyright (c) 2020 Red Hat, Inc.

 *

 * 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; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA. 

 *

 * $Id: //eng/vdo-releases/aluminum/src/c++/vdo/kernel/workQueueHandle.c#2 $

 */

#include "workQueueHandle.h"

WorkQueueStackHandleGlobals workQueueStackHandleGlobals;

/**********************************************************************/

void initializeWorkQueueStackHandle(WorkQueueStackHandle *handle,

                                    SimpleWorkQueue      *queue)

{

  handle->nonce = workQueueStackHandleGlobals.nonce;

  handle->queue = queue;

  long offset = (char *) handle - (char *) task_stack_page(current);

  spin_lock(&workQueueStackHandleGlobals.offsetLock);

  if (workQueueStackHandleGlobals.offset == 0) {

    workQueueStackHandleGlobals.offset = offset;

    spin_unlock(&workQueueStackHandleGlobals.offsetLock);

  } else {

    long foundOffset = workQueueStackHandleGlobals.offset;

    spin_unlock(&workQueueStackHandleGlobals.offsetLock);

    BUG_ON(foundOffset != offset);

  }

}

/**********************************************************************/

void initWorkQueueStackHandleOnce(void)

{

  spin_lock_init(&workQueueStackHandleGlobals.offsetLock);

  workQueueStackHandleGlobals.nonce = currentTime(CLOCK_MONOTONIC);

}