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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* Copyright (c) 2006-2025 RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-11-01 Shell Init ver.
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*/
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#ifndef __LWP_FUTEX_INTERNAL_H__
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#define __LWP_FUTEX_INTERNAL_H__
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#define DBG_TAG "lwp.futex"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#include "rt_uthash.h"
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#include "lwp_internal.h"
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#include "lwp_pid.h"
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#include <rtthread.h>
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#include <lwp.h>
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#ifdef ARCH_MM_MMU
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#include <lwp_user_mm.h>
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#endif /* ARCH_MM_MMU */
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/**
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* @brief Shared futex key structure
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*
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* @note This structure represents a key used to identify shared futexes
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* in the system.
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*/
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struct shared_futex_key
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{
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rt_mem_obj_t mobj; /**< Memory object associated with the futex */
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rt_base_t offset; /**< Offset within the memory object */
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};
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DEFINE_RT_UTHASH_TYPE(shared_futex_entry, struct shared_futex_key, key);
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/**
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* @brief Futex structure for thread synchronization
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*
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* @note This structure represents a futex used for thread synchronization.
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* It can be either private (process-local) or shared between processes.
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*/
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struct rt_futex
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{
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union
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{
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/* for private futex */
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struct lwp_avl_struct node; /**< AVL tree node for private futex */
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/* for shared futex */
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struct shared_futex_entry entry; /**< Entry for shared futex */
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};
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rt_list_t waiting_thread; /**< List of threads waiting on the futex */
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struct rt_object *custom_obj; /**< Custom object associated with the futex */
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rt_mutex_t mutex; /**< kernel mutex object for futex */
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};
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typedef struct rt_futex *rt_futex_t;
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rt_err_t futex_global_table_add(struct shared_futex_key *key, rt_futex_t futex);
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rt_err_t futex_global_table_find(struct shared_futex_key *key, rt_futex_t *futex);
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rt_err_t futex_global_table_delete(struct shared_futex_key *key);
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#endif /* __LWP_FUTEX_INTERNAL_H__ */
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