40f92a9da4
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@595 42af7a65-404d-4744-a932-0658087f49c3
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/****************************************************************************
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* sched/wd_create.c
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*
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <wdog.h>
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#include <queue.h>
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#include <nuttx/arch.h>
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#include "wd_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: wd_create
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*
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* Description:
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* The wd_create function will create a watchdog by allocating it from the
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* list of free watchdogs.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* Pointer to watchdog (i.e., the watchdog ID), or NULL if insufficient
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* watchdogs are available.
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*
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* Assumptions:
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*
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****************************************************************************/
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WDOG_ID wd_create (void)
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{
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FAR wdog_t *wdog;
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irqstate_t saved_state;
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saved_state = irqsave();
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wdog = (FAR wdog_t*)sq_remfirst(&g_wdfreelist);
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irqrestore(saved_state);
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/* Indicate that the watchdog is not actively timing */
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if (wdog)
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{
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wdog->next = NULL;
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wdog->active = FALSE;
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}
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return (WDOG_ID)wdog;
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}
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