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Diffstat (limited to 'nuttx/sched/wd_create.c')
-rw-r--r-- | nuttx/sched/wd_create.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/nuttx/sched/wd_create.c b/nuttx/sched/wd_create.c new file mode 100644 index 000000000..d86171bf7 --- /dev/null +++ b/nuttx/sched/wd_create.c @@ -0,0 +1,109 @@ +/**************************************************************************** + * sched/wd_create.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdbool.h> +#include <wdog.h> +#include <queue.h> +#include <nuttx/arch.h> + +#include "wd_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: wd_create + * + * Description: + * The wd_create function will create a watchdog by allocating it from the + * list of free watchdogs. + * + * Parameters: + * None + * + * Return Value: + * Pointer to watchdog (i.e., the watchdog ID), or NULL if insufficient + * watchdogs are available. + * + * Assumptions: + * + ****************************************************************************/ + +WDOG_ID wd_create (void) +{ + FAR wdog_t *wdog; + irqstate_t saved_state; + + saved_state = irqsave(); + wdog = (FAR wdog_t*)sq_remfirst(&g_wdfreelist); + irqrestore(saved_state); + + /* Indicate that the watchdog is not actively timing */ + + if (wdog) + { + wdog->next = NULL; + wdog->active = false; + } + + return (WDOG_ID)wdog; +} |