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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/task_delete.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/task_delete.c')
-rw-r--r-- | nuttx/sched/task_delete.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/nuttx/sched/task_delete.c b/nuttx/sched/task_delete.c new file mode 100644 index 000000000..5a28c3d42 --- /dev/null +++ b/nuttx/sched/task_delete.c @@ -0,0 +1,165 @@ +/************************************************************ + * task_delete.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 <nuttx/config.h> + +#include <sys/types.h> +#include <sched.h> +#include <nuttx/os_external.h> +#include "os_internal.h" +#include "sig_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Name: task_delete + * + * Description: + * This function causes a specified task to cease to exist. + * Its stack and TCB will be deallocated. This function + * is the companion to task_create(). + * + * Inputs: + * pid - The task ID of the task to delete. A pid of zero + * signifies the calling task. + * + * Return Value: + * OK on success; or ERROR on failure + * + * This function can fail if the provided pid does not + * correspond to a task (errno is not set) + * + ************************************************************/ + +STATUS task_delete(pid_t pid) +{ + _TCB *rtcb; + _TCB *dtcb; + uint32 saved_state; + STATUS ret = ERROR; + + /* Check if the task to delete is the calling task */ + + rtcb = (_TCB*)g_readytorun.head; + if (pid == 0 || pid == rtcb->pid) + { + /* If it is, then what we really wanted to do was exit. + * Note that we don't bother to unlock the TCB since + * it will be going away. + */ + + exit(EXIT_SUCCESS); + } + + /* Make sure the task does not become ready-to-run while + * we are futzing with its TCB by locking ourselves as the + * executing task. + * + * Frist, find for the TCB associated with matching pid + */ + + dtcb = sched_gettcb(pid); + if (!dtcb) + { + /* This pid does not correspond to any known task */ + + sched_unlock(); + return ERROR; + } + + /* Verify our internal sanity */ + + if (dtcb->task_state == TSTATE_TASK_RUNNING || + dtcb->task_state >= NUM_TASK_STATES) + { + sched_unlock(); + PANIC(OSERR_BADDELETESTATE); + } + + saved_state = irqsave(); + + /* Inform the instrumentation layer that the task has stopped */ + + sched_note_stop(dtcb); + + /* Remove the task from the OS's tasks lists. */ + + dq_rem((dq_entry_t*)dtcb, g_tasklisttable[dtcb->task_state].list); + dtcb->task_state = TSTATE_TASK_INVALID; + irqrestore(saved_state); + + /* At this point, the TCB should no longer be accessible to the system */ + + sched_unlock(); + + /* Deallocate anything left in the TCB's queues */ + + sig_cleanup(dtcb); /* Deallocate Signal lists */ + + /* Deallocate its TCB */ + + sched_releasetcb(dtcb); + return ret; +} |