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92 lines
4.1 KiB
92 lines
4.1 KiB
/* ----------------------------------------------------------------------------
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* Copyright (c) Huawei Technologies Co., Ltd. 2013-2020. All rights reserved.
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* Description: Semaphore Private HeadFile
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* Author: Huawei LiteOS Team
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* Create: 2013-01-01
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --------------------------------------------------------------------------- */
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//这个头文件定义了一些关于信号量的数据结构和函数声明，用于信号量的控制和管理。
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#ifndef _LOS_SEM_PRI_H
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#define _LOS_SEM_PRI_H
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#include "los_sem.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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/* Semaphore control structure. */
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//信号量控制块的数据结构
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typedef struct {
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UINT8 semStat;//信号量的状态 /* Semaphore state, enum LosSemState */
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UINT8 semType;//信号量的类型 /* Semaphore Type, enum LosSemType */
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UINT16 semCount;//信号量可用数量 /* number of available semaphores */
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UINT32 semId;//信号量ID /* Semaphore control structure ID, COUNT(UINT16)|INDEX(UINT16) */
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LOS_DL_LIST semList; /* List of tasks that are waiting on a semaphore */
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} LosSemCB;
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/* Semaphore type */
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//信号量类型的枚举值：包括计数信号量和二进制信号量
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enum {
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OS_SEM_COUNTING, /* The semaphore is a counting semaphore which max count is LOS_SEM_COUNT_MAX */
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OS_SEM_BINARY, /* The semaphore is a binary semaphore which max count is OS_SEM_BINARY_COUNT_MAX */
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};
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/* Max count of binary semaphores */
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//二进制信号量的最大计数值
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#define OS_SEM_BINARY_COUNT_MAX 1
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/* Semaphore information control block */
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//信号量信息控制块的全局指针
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extern LosSemCB *g_allSem;
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#define GET_SEM_LIST(ptr) LOS_DL_LIST_ENTRY(ptr, LosSemCB, semList)
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#ifndef LOSCFG_RESOURCE_ID_NOT_USE_HIGH_BITS
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/* COUNT | INDEX split bit */
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#define SEM_SPLIT_BIT 16
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#define SET_SEM_ID(count, semId) (((count) << SEM_SPLIT_BIT) | (semId))
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#define GET_SEM_INDEX(semId) ((semId) & ((1U << SEM_SPLIT_BIT) - 1))
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#define GET_SEM_COUNT(semId) ((semId) >> SEM_SPLIT_BIT)
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#else
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#define GET_SEM_INDEX(semId) (semId)
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#endif
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#define GET_SEM(semId) (((LosSemCB *)g_allSem) + GET_SEM_INDEX(semId))
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/* This API is used to create a semaphore control structure according to the initial number of available semaphores
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* specified by count and return the ID of this semaphore control structure. */
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用于根据初始可用信号量的数量创建信号量控制结构的函数
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extern UINT32 OsSemInit(VOID);
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* _LOS_SEM_PRI_H */
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