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Diffstat (limited to 'nuttx/sched/wd_gettime.c')
-rw-r--r-- | nuttx/sched/wd_gettime.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/nuttx/sched/wd_gettime.c b/nuttx/sched/wd_gettime.c new file mode 100644 index 000000000..caa482549 --- /dev/null +++ b/nuttx/sched/wd_gettime.c @@ -0,0 +1,118 @@ +/******************************************************************************** + * sched/wd_gettime.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 <wdog.h> + +#include "os_internal.h" +#include "wd_internal.h" + +/******************************************************************************** + * Definitions + ********************************************************************************/ + +/******************************************************************************** + * Private Types + ********************************************************************************/ + +/******************************************************************************** + * Global Variables + ********************************************************************************/ + +/******************************************************************************** + * Private Variables + ********************************************************************************/ + +/******************************************************************************** + * Private Functions + ********************************************************************************/ + +/******************************************************************************** + * Public Functions + ********************************************************************************/ + +/******************************************************************************** + * Name: wd_gettime + * + * Description: + * This function returns the time remaining before the specified watchdog + * expires. + * + * Parameters: + * wdog = watchdog ID + * + * Return Value: + * The time in system ticks remaining until the watchdog time expires. Zero + * means either that wdog is not valid or that the wdog has already expired. + * + * Assumptions: + * + ********************************************************************************/ + +int wd_gettime(WDOG_ID wdog) +{ + irqstate_t flags; + + /* Verify the wdog */ + + flags = irqsave(); + if (wdog && wdog->active) + { + /* Traverse the watchdog list accumulating lag times until we find the wdog + * that we are looking for + */ + + wdog_t *curr; + int delay = 0; + + for (curr = (wdog_t*)g_wdactivelist.head; curr; curr = curr->next) + { + delay += curr->lag; + if (curr == wdog) + { + irqrestore(flags); + return delay; + } + } + } + + irqrestore(flags); + return 0; +} |