153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/****************************************************************************
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* sched/pthread/pthread_findjoininfo.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 <debug.h>
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#include "group/group.h"
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#include "pthread/pthread.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_createjoininfo
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*
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* Description:
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* Allocate a detachable structure to support pthread_join logic and add
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* the joininfo to the thread.
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*
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* Input Parameters:
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* ptcb
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*
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* Returned Value:
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* joininfo point.
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*
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* Assumptions:
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*
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****************************************************************************/
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static FAR struct join_s *
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pthread_createjoininfo(FAR struct pthread_tcb_s *ptcb)
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{
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FAR struct join_s *pjoin;
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/* Allocate a detachable structure to support pthread_join logic */
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pjoin = (FAR struct join_s *)kmm_zalloc(sizeof(struct join_s));
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if (!pjoin)
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{
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serr("ERROR: Failed to allocate join\n");
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return NULL;
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}
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pjoin->thread = (pthread_t)ptcb->cmn.pid;
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/* Initialize the semaphore in the join structure to zero. */
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if (nxsem_init(&pjoin->exit_sem, 0, 0) < 0)
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{
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kmm_free(pjoin);
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return NULL;
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}
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else
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{
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FAR struct task_group_s *group = ptcb->cmn.group;
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/* Attach the join info to the TCB. */
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ptcb->joininfo = (FAR void *)pjoin;
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pjoin->next = NULL;
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if (!group->tg_jointail)
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{
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group->tg_joinhead = pjoin;
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}
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else
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{
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group->tg_jointail->next = pjoin;
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}
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group->tg_jointail = pjoin;
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}
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return pjoin;
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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: pthread_findjoininfo
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*
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* Description:
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* Find a join structure in a local data set.
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*
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* Input Parameters:
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* group - The group that the pid is (or was) a member of
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* pid - The ID of the pthread
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*
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* Returned Value:
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* None or pointer to the found entry.
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*
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* Assumptions:
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* The caller has provided protection from re-entrancy.
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*
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****************************************************************************/
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FAR struct join_s *pthread_findjoininfo(FAR struct task_group_s *group,
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pid_t pid)
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{
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FAR struct join_s *pjoin;
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DEBUGASSERT(group);
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/* Find the entry with the matching pid */
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for (pjoin = group->tg_joinhead;
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(pjoin && (pid_t)pjoin->thread != pid);
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pjoin = pjoin->next);
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/* and return it */
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if (pjoin == NULL)
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{
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FAR struct tcb_s *tcb = nxsched_get_tcb(pid);
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if (tcb != NULL && (tcb->flags & TCB_FLAG_DETACHED) == 0 &&
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(tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD &&
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tcb->group == group)
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{
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pjoin = pthread_createjoininfo((FAR struct pthread_tcb_s *)tcb);
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}
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}
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return pjoin;
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}
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