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Diffstat (limited to 'nuttx/sched/wd_cancel.c')
-rw-r--r-- | nuttx/sched/wd_cancel.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/nuttx/sched/wd_cancel.c b/nuttx/sched/wd_cancel.c new file mode 100644 index 000000000..0bd59cf89 --- /dev/null +++ b/nuttx/sched/wd_cancel.c @@ -0,0 +1,165 @@ +/**************************************************************************** + * sched/wd_cancel.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 <assert.h> +#include <wdog.h> +#include <nuttx/arch.h> + +#include "os_internal.h" +#include "wd_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: wd_cancel + * + * Description: + * This function cancels a currently running watchdog timer. Watchdog + * timers may be canceled from the interrupt level. + * + * Parameters: + * wdid - ID of the watchdog to cancel. + * + * Return Value: + * OK or ERROR + * + * Assumptions: + * + ****************************************************************************/ + +int wd_cancel (WDOG_ID wdid) +{ + wdog_t *curr; + wdog_t *prev; + irqstate_t saved_state; + int ret = ERROR; + + /* Prohibit timer interactions with the timer queue until the + * cancellation is complete + */ + + saved_state = irqsave(); + + /* Make sure that the watchdog is initialed (non-NULL) and is still active */ + + if (wdid && wdid->active) + { + /* Search the g_wdactivelist for the target FCB. We can't use sq_rem + * to do this because there are additional operations that need to be + * done. + */ + + prev = NULL; + curr = (wdog_t*)g_wdactivelist.head; + + while((curr) && (curr != wdid)) + { + prev = curr; + curr = curr->next; + } + + /* Check if the watchdog was found in the list. If not, then an OS + * error has occurred because the watchdog is marked active! + */ + + if (!curr) + { + PANIC(OSERR_WDOGNOTFOUND); + } + else + { + /* If there is a watchdog in the timer queue after the one that + * is being canceled, then it inherits the remaining ticks. + */ + + if (curr->next) + { + curr->next->lag += curr->lag; + } + + /* Now, remove the watchdog from the timer queue */ + + if (prev) + { + (void)sq_remafter((FAR sq_entry_t*)prev, &g_wdactivelist); + } + else + { + (void)sq_remfirst(&g_wdactivelist); + } + wdid->next = NULL; + + /* Return success */ + + ret = OK; + } + + /* Mark the watchdog inactive */ + + wdid->active = false; + } + + irqrestore(saved_state); + return ret; +} |