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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/sched/wd_cancel.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/sched/wd_cancel.c')
-rw-r--r-- | nuttx/sched/wd_cancel.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/nuttx/sched/wd_cancel.c b/nuttx/sched/wd_cancel.c new file mode 100644 index 000000000..9a3a223fd --- /dev/null +++ b/nuttx/sched/wd_cancel.c @@ -0,0 +1,154 @@ +/************************************************************ + * wd_cancel.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> +#include <assert.h> +#include <wdog.h> +#include <nuttx/arch.h> +#include "os_internal.h" +#include "wd_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: 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: + * + ************************************************************/ + +STATUS wd_cancel (WDOG_ID wdid) +{ + wdog_t *curr; + wdog_t *prev; + uint32 saved_state; + STATUS ret = ERROR; + + /* Prohibit timer interactions with the timer queue until the + * cancellation is complete + */ + + saved_state = irqsave(); + + /* Make sure that the the watchdog is still active */ + + if (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((sq_entry_t*)prev, &g_wdactivelist); + else + (void)sq_remfirst(&g_wdactivelist); + wdid->next = NULL; + + /* If we made it this far, then we were successful */ + + ret = OK; + } + + /* Mark the watchdog inactive */ + + wdid->active = FALSE; + } + irqrestore(saved_state); + return ret; +} |