119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/****************************************************************************
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* sched/misc/deadlock.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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/mutex.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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struct deadlock_info_s
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{
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FAR pid_t *pid;
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size_t count;
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size_t found;
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: collect_deadlock
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****************************************************************************/
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static void collect_deadlock(FAR struct tcb_s *tcb, FAR void *arg)
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{
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if (tcb->task_state == TSTATE_WAIT_SEM)
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{
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FAR sem_t *sem = tcb->waitobj;
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if (sem != NULL && (sem->flags & SEM_TYPE_MUTEX) != 0)
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{
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FAR struct deadlock_info_s *info = arg;
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size_t index;
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for (index = 0; index < info->found; index++)
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{
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if (info->pid[index] == tcb->pid)
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{
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return;
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}
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}
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for (index = info->found; index < info->count; index++)
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{
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pid_t next;
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size_t i;
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next = ((FAR mutex_t *)sem)->holder;
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for (i = info->found; i < index; i++)
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{
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if (info->pid[i] == next)
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{
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info->found = index;
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return;
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}
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}
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info->pid[index] = tcb->pid;
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tcb = nxsched_get_tcb(next);
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}
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsched_collect_deadlock
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*
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* Description:
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* Check if there is a deadlock and get the thread pid of the deadlock.
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*
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* Input parameters:
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* pid - The array to store the thread pid of the deadlock.
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* count - The size of the pid array.
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*
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* Returned Value:
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* The number of thread deadlocks.
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*
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****************************************************************************/
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size_t nxsched_collect_deadlock(FAR pid_t *pid, size_t count)
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{
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struct deadlock_info_s info;
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info.pid = pid;
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info.count = count;
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info.found = 0;
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nxsched_foreach(collect_deadlock, &info);
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return info.found;
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}
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