123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/****************************************************************************
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* sched/task/task_terminate.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/queue.h>
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#include <nuttx/sched.h>
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#include <nuttx/irq.h>
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#include <nuttx/sched_note.h>
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#include "sched/sched.h"
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#include "signal/signal.h"
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#include "task/task.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtask_terminate
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*
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* Description:
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* This function causes a specified task to cease to exist. Its stack and
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* TCB will be deallocated. This function is the internal implementation
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* of the task_delete() function. It includes and additional parameter
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* to determine if blocking is permitted or not.
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*
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* This function is the final function called all task termination
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* sequences. nxtask_terminate() is called only from task_delete() and
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* from nxtask_exit().
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*
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* The path through nxtask_exit() supports the final stops of the exit(),
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* _exit(), and pthread_exit
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*
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* - pthread_exit(). Calls _exit()
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* - exit(). Calls _exit()
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* - _exit(). Calls nxtask_exit() making the currently running task
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* non-running. nxtask_exit then calls nxtask_terminate() to terminate
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* the non-running task.
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*
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* Input Parameters:
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* pid - The task ID of the task to delete. A pid of zero
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* signifies the calling task.
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*
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* Returned Value:
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* OK on success; or ERROR on failure
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*
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* This function can fail if the provided pid does not correspond to a
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* task (errno is not set)
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*
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****************************************************************************/
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int nxtask_terminate(pid_t pid)
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{
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FAR struct tcb_s *dtcb;
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uint8_t task_state;
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irqstate_t flags;
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flags = enter_critical_section();
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/* Find for the TCB associated with matching PID */
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dtcb = nxsched_get_tcb(pid);
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if (!dtcb)
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{
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leave_critical_section(flags);
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return -ESRCH;
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}
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/* Remove dtcb from tasklist, let remove_readtorun() do the job */
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task_state = dtcb->task_state;
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nxsched_remove_readytorun(dtcb, false);
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dtcb->task_state = task_state;
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leave_critical_section(flags);
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/* Perform common task termination logic. We need to do
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* this as early as possible so that higher level clean-up logic
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* can run in a healthy tasking environment.
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*
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* I suppose EXIT_SUCCESS is an appropriate return value???
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*/
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nxtask_exithook(dtcb, EXIT_SUCCESS);
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/* Since all tasks pass through this function as the final step in their
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* exit sequence, this is an appropriate place to inform any
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* instrumentation layer that the task no longer exists.
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*/
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sched_note_stop(dtcb);
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/* Deallocate its TCB */
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return nxsched_release_tcb(dtcb, dtcb->flags & TCB_FLAG_TTYPE_MASK);
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}
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