88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/****************************************************************************
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* sched/group/group_find.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 <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/sched.h>
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#include "group/group.h"
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#include "environ/environ.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: group_findbypid
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*
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* Description:
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* Given a task ID, find the group task structure with was started by that
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* task ID. That task's ID is retained in the group as tg_pid and will
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* be remember even if the main task thread leaves the group.
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*
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* Input Parameters:
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* pid - The task ID of the main task thread.
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*
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* Returned Value:
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* On success, a pointer to the group task structure is returned. This
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* function can fail only if there is no group that corresponds to the
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* task ID.
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*
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* Assumptions:
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* Called during when signally tasks in a safe context. No special
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* precautions should be required here. However, extra care is taken when
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* accessing the global g_grouphead list.
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*
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****************************************************************************/
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#if defined(HAVE_GROUP_MEMBERS) || defined(CONFIG_ARCH_ADDRENV)
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FAR struct task_group_s *group_findbypid(pid_t pid)
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{
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FAR struct task_group_s *group;
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irqstate_t flags;
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/* Find the status structure with the matching PID */
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flags = enter_critical_section();
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for (group = g_grouphead; group; group = group->flink)
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{
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if (group->tg_pid == pid)
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{
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leave_critical_section(flags);
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return group;
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}
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}
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leave_critical_section(flags);
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return NULL;
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}
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#endif
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