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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/sched_removereadytorun.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/sched_removereadytorun.c')
-rw-r--r-- | nuttx/sched/sched_removereadytorun.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/nuttx/sched/sched_removereadytorun.c b/nuttx/sched/sched_removereadytorun.c new file mode 100644 index 000000000..24057f3b7 --- /dev/null +++ b/nuttx/sched/sched_removereadytorun.c @@ -0,0 +1,117 @@ +/************************************************************ + * sched_removereadytorun.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 <queue.h> +#include <assert.h> +#include "os_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Name: sched_removereadytorun + * + * Description: + * This function removes a TCB from the ready to run list. + * + * Inputs: + * rtcb - Points to the TCB that is ready-to-run + * + * Return Value: + * TRUE if the currently active task (the head of the + * g_readytorun list) has changed. + * + * Assumptions: + * - The caller has established a critical section before + * calling this function (calling sched_lock() first is NOT + * a good idea -- use irqsave()). + * - The caller handles the condition that occurs if the + * the head of the g_readytorun list is changed. + ************************************************************/ + +boolean sched_removereadytorun(_TCB *rtcb) +{ + boolean ret = FALSE; + + /* Check if the TCB to be removed is at the head of the ready + * to run list. In this case, we are removing the currently + * active task. + */ + + if (!rtcb->blink) + { + ASSERT(rtcb->flink != NULL); + + /* Inform the instrumentation layer that we are switching tasks */ + + sched_note_switch(rtcb, rtcb->flink); + + rtcb->flink->task_state = TSTATE_TASK_RUNNING; + ret = TRUE; + } + + /* Remove the TCB from the ready-to-run list */ + + dq_rem((dq_entry_t*)rtcb, &g_readytorun); + + rtcb->task_state = TSTATE_TASK_INVALID; + return ret; +} |