a2941532bd
pthread_exit will be called recursive when pthread_cancel or other cleanup operation with syscalls that support cancellation, to avoid this by mark current tcb flag as TCB_FLAG_CANCEL_DOING instead of TCB_FLAG_CANCEL_PENDING. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/****************************************************************************
|
|
* sched/pthread/pthread_cancel.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
#include <errno.h>
|
|
|
|
#include "sched/sched.h"
|
|
#include "task/task.h"
|
|
#include "pthread/pthread.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
int pthread_cancel(pthread_t thread)
|
|
{
|
|
FAR struct tcb_s *tcb;
|
|
|
|
/* First, make sure that the handle references a valid thread */
|
|
|
|
if (thread == 0)
|
|
{
|
|
/* pid == 0 is the IDLE task (in a single CPU configuration). Callers
|
|
* cannot cancel the IDLE task.
|
|
*/
|
|
|
|
return ESRCH;
|
|
}
|
|
|
|
tcb = nxsched_get_tcb((pid_t)thread);
|
|
if (tcb == NULL)
|
|
{
|
|
/* The pid does not correspond to any known thread. The thread
|
|
* has probably already exited.
|
|
*/
|
|
|
|
return ESRCH;
|
|
}
|
|
|
|
/* Only pthreads should use this interface */
|
|
|
|
DEBUGASSERT((tcb->flags & TCB_FLAG_TTYPE_MASK) ==
|
|
TCB_FLAG_TTYPE_PTHREAD);
|
|
|
|
/* Notify the target if the non-cancelable or deferred cancellation set */
|
|
|
|
if (nxnotify_cancellation(tcb))
|
|
{
|
|
return OK;
|
|
}
|
|
|
|
/* Otherwise, perform the asyncrhonous cancellation */
|
|
|
|
/* Check to see if the ID refers to ourselves.. this would be the
|
|
* same as pthread_exit(PTHREAD_CANCELED).
|
|
*/
|
|
|
|
if (tcb == this_task())
|
|
{
|
|
tcb->flags &= ~TCB_FLAG_CANCEL_PENDING;
|
|
tcb->flags |= TCB_FLAG_CANCEL_DOING;
|
|
#if !defined(CONFIG_BUILD_FLAT) && defined(__KERNEL__)
|
|
up_pthread_exit(((FAR struct pthread_tcb_s *)tcb)->exit,
|
|
PTHREAD_CANCELED);
|
|
#else
|
|
pthread_exit(PTHREAD_CANCELED);
|
|
#endif
|
|
}
|
|
|
|
/* Complete pending join operations */
|
|
|
|
pthread_completejoin((pid_t)thread, PTHREAD_CANCELED);
|
|
|
|
#ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
|
|
/* Recover any mutexes still held by the canceled thread */
|
|
|
|
pthread_mutex_inconsistent(tcb);
|
|
#endif
|
|
|
|
/* Then let nxtask_terminate do the real work */
|
|
|
|
return nxtask_terminate((pid_t)thread, false);
|
|
}
|