112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/****************************************************************************
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* sched/pthread/pthread_cancel.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 <unistd.h>
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#include <pthread.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/tls.h>
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#include <nuttx/pthread.h>
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#include "sched/sched.h"
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#include "task/task.h"
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int pthread_cancel(pthread_t thread)
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{
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FAR struct tcb_s *tcb;
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/* First, make sure that the handle references a valid thread */
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if ((pid_t)thread == IDLE_PROCESS_ID)
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{
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/* pid == 0 is the IDLE task (in a single CPU configuration). Callers
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* cannot cancel the IDLE task.
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*/
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return ESRCH;
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}
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tcb = nxsched_get_tcb((pid_t)thread);
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if (tcb == NULL)
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{
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/* The pid does not correspond to any known thread. The thread
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* has probably already exited.
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*/
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return ESRCH;
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}
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/* Only pthreads should use this interface */
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DEBUGASSERT((tcb->flags & TCB_FLAG_TTYPE_MASK) ==
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TCB_FLAG_TTYPE_PTHREAD);
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/* Notify the target if the non-cancelable or deferred cancellation set */
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if (nxnotify_cancellation(tcb))
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{
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return OK;
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}
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/* Otherwise, perform the asyncrhonous cancellation */
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/* Check to see if the ID refers to ourselves.. this would be the
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* same as pthread_exit(PTHREAD_CANCELED).
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*/
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if (tcb == this_task())
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{
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pthread_exit(PTHREAD_CANCELED);
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}
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/* Refer to up_tls_info() */
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#ifdef CONFIG_PTHREAD_CLEANUP
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pthread_cleanup_popall(tcb->stack_alloc_ptr);
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#endif
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/* Complete pending join operations */
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pthread_completejoin((pid_t)thread, PTHREAD_CANCELED);
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#ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
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/* Recover any mutexes still held by the canceled thread */
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pthread_mutex_inconsistent(tcb);
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#endif
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/* Then let nxtask_terminate do the real work */
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return nxtask_terminate((pid_t)thread, false);
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}
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