mirror of
https://github.com/apache/nuttx.git
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678f69b32a
This reverts commit 29e50ffa73.
reason:
Placing the main thread and the gourd in the same memory block, and allocating and freeing memory simultaneously, presents the following two problems：
When the main thread creates a child thread and performs a detach operation, there is a possibility that the main thread may have exited, but the main thread's TCB (Transaction Control Block) may not have been released.
This could potentially cause the main thread's TCB to be double-freed. The core contradiction in this problem lies in binding the main thread's TCB (Trust Container Registry) and the group together. When releasing the main thread's TCB, an additional check is needed to ensure the main thread was the last to leave the group. If this check and the free operation are atomically guaranteed, the logic is sound, and double freeing won't occur. However, this atomicity cannot be completely guaranteed. If other free operations cause a block, problems still arise.
Signed-off-by: wangzhi16 <wangzhi16@xiaomi.com>
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/****************************************************************************
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* sched/group/group.h
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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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#ifndef __SCHED_GROUP_GROUP_H
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#define __SCHED_GROUP_GROUP_H
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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 <stdbool.h>
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#include <sched.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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typedef int (*foreachchild_t)(pid_t pid, FAR void *arg);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef CONFIG_SCHED_CHILD_STATUS
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void task_initialize(void);
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#else
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# define task_initialize()
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#endif
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/* Task group data structure management */
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int group_allocate(FAR struct task_tcb_s *tcb, uint8_t ttype);
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void group_initialize(FAR struct task_tcb_s *tcb);
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#ifndef CONFIG_DISABLE_PTHREAD
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void group_bind(FAR struct pthread_tcb_s *tcb);
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void group_join(FAR struct pthread_tcb_s *tcb);
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#endif
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void group_leave(FAR struct tcb_s *tcb);
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void group_drop(FAR struct task_group_s *group);
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#if defined(CONFIG_SCHED_WAITPID) && !defined(CONFIG_SCHED_HAVE_PARENT)
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void group_add_waiter(FAR struct task_group_s *group);
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void group_del_waiter(FAR struct task_group_s *group);
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#endif
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#ifdef HAVE_GROUP_MEMBERS
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int group_foreachchild(FAR struct task_group_s *group,
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foreachchild_t handler, FAR void *arg);
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int group_kill_children(FAR struct tcb_s *tcb);
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#ifdef CONFIG_SIG_SIGSTOP_ACTION
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int group_suspend_children(FAR struct tcb_s *tcb);
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int group_continue(FAR struct tcb_s *tcb);
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#endif
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#endif
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/* Convenience functions */
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FAR struct task_group_s *task_getgroup(pid_t pid);
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/* Signaling group members */
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int group_signal(FAR struct task_group_s *group, FAR siginfo_t *siginfo);
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/* Parent/child data management */
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#ifdef CONFIG_SCHED_HAVE_PARENT
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int task_reparent(pid_t ppid, pid_t chpid);
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#ifdef CONFIG_SCHED_CHILD_STATUS
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FAR struct child_status_s *group_alloc_child(void);
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void group_free_child(FAR struct child_status_s *status);
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void group_add_child(FAR struct task_group_s *group,
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FAR struct child_status_s *child);
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FAR struct child_status_s *group_exit_child(FAR struct task_group_s *group);
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FAR struct child_status_s *group_find_child(FAR struct task_group_s *group,
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pid_t pid);
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FAR struct child_status_s *group_remove_child(FAR struct task_group_s *group,
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pid_t pid);
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void group_remove_children(FAR struct task_group_s *group);
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#endif /* CONFIG_SCHED_CHILD_STATUS */
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#endif /* CONFIG_SCHED_HAVE_PARENT */
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/* Group data resource configuration */
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int group_setupidlefiles(void);
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int group_setuptaskfiles(FAR struct task_tcb_s *tcb,
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FAR const posix_spawn_file_actions_t *actions,
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bool cloexec);
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#endif /* __SCHED_GROUP_GROUP_H */
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