140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/****************************************************************************
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* sched/task/task_setcancelstate.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 <stdlib.h>
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#include <pthread.h>
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#include <sched.h>
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#include <errno.h>
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#include "sched/sched.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: task_setcancelstate
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*
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* Description:
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* The task_setcancelstate() function atomically both sets the calling
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* task's cancellability state to the indicated state and returns the
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* previous cancellability state at the location referenced by oldstate.
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* Legal values for state are TASK_CANCEL_ENABLE and TASK_CANCEL_DISABLE.
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*
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* The cancellability state and type of any newly created tasks are
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* TASK_CANCEL_ENABLE and TASK_CANCEL_DEFERRED respectively.
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*
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* Input Parameters:
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* state - the new cancellability state, either TASK_CANCEL_ENABLE or
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* TASK_CANCEL_DISABLE
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* oldstate - The location to return the old cancellability state.
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*
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* Returned Value:
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* Zero (OK) on success; ERROR is returned on any failure with the
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* errno value set appropriately.
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*
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****************************************************************************/
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int task_setcancelstate(int state, FAR int *oldstate)
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{
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FAR struct tcb_s *tcb = this_task();
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int ret = OK;
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/* Suppress context changes for a bit so that the flags are stable. (the
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* flags should not change in interrupt handling).
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*/
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sched_lock();
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/* Return the current state if so requested */
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if (oldstate != NULL)
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{
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if ((tcb->flags & TCB_FLAG_NONCANCELABLE) != 0)
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{
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*oldstate = TASK_CANCEL_DISABLE;
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}
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else
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{
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*oldstate = TASK_CANCEL_ENABLE;
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}
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}
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/* Set the new cancellation state */
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if (state == TASK_CANCEL_ENABLE)
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{
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/* Clear the non-cancelable flag */
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tcb->flags &= ~TCB_FLAG_NONCANCELABLE;
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/* Check if a cancellation was pending */
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if ((tcb->flags & TCB_FLAG_CANCEL_PENDING) != 0)
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{
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#ifdef CONFIG_CANCELLATION_POINTS
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/* If we are using deferred cancellation? */
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if ((tcb->flags & TCB_FLAG_CANCEL_DEFERRED) == 0)
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#endif
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{
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/* No.. We are using asynchronous cancellation. If the
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* cancellation was pending in this case, then just exit.
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*/
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tcb->flags &= ~TCB_FLAG_CANCEL_PENDING;
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#ifndef CONFIG_DISABLE_PTHREAD
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if ((tcb->flags & TCB_FLAG_TTYPE_MASK) ==
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TCB_FLAG_TTYPE_PTHREAD)
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{
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pthread_exit(PTHREAD_CANCELED);
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}
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else
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#endif
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{
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_exit(EXIT_FAILURE);
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}
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}
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}
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}
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else if (state == TASK_CANCEL_DISABLE)
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{
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/* Set the non-cancelable state */
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tcb->flags |= TCB_FLAG_NONCANCELABLE;
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}
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else
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{
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set_errno(EINVAL);
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ret = ERROR;
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}
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sched_unlock();
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return ret;
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}
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