313 lines
11 KiB
C
313 lines
11 KiB
C
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/*
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* Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
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*
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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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*
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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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*
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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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*
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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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*
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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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/**
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* @defgroup los_sem Semaphore
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* @ingroup kernel
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*/
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#ifndef _LOS_SEM_H
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#define _LOS_SEM_H
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#include "los_base.h"
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#include "los_err.h"
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#include "los_list.h"
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#include "los_task.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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/**
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* @ingroup los_sem
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* Semaphore error code: The memory is insufficient.
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*
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* Value: 0x02000700
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*
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* Solution: Allocate more memory.
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*/
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#define LOS_ERRNO_SEM_NO_MEMORY LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x00)
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/**
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* @ingroup los_sem
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* Semaphore error code: Invalid parameter.
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*
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* Value: 0x02000701
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*
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* Solution: Change the passed-in invalid parameter value to a valid value.
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*/
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#define LOS_ERRNO_SEM_INVALID LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x01)
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/**
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* @ingroup los_sem
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* Semaphore error code: Null pointer.
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*
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* Value: 0x02000702
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*
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* Solution: Change the passed-in null pointer to a valid non-null pointer.
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*/
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#define LOS_ERRNO_SEM_PTR_NULL LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x02)
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/**
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* @ingroup los_sem
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* Semaphore error code: No semaphore control structure is available.
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*
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* Value: 0x02000703
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*
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* Solution: Perform corresponding operations based on the requirements in the code context.
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*/
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#define LOS_ERRNO_SEM_ALL_BUSY LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x03)
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/**
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* @ingroup los_sem
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* Semaphore error code: Invalid parameter that specifies the timeout interval.
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*
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* Value: 0x02000704
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*
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*
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* Solution: Change the passed-in parameter value to a valid nonzero value.
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*/
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#define LOS_ERRNO_SEM_UNAVAILABLE LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x04)
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/**
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* @ingroup los_sem
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* Semaphore error code: The API is called during an interrupt, which is forbidden.
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*
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* Value: 0x02000705
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*
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* Solution: Do not call the API during an interrupt.
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*/
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#define LOS_ERRNO_SEM_PEND_INTERR LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x05)
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/**
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* @ingroup los_sem
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* Semaphore error code: The task is unable to request a semaphore because task scheduling is locked.
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*
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* Value: 0x02000706
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*
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* Solution: Do not call LOS_SemPend when task scheduling is locked.
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*/
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#define LOS_ERRNO_SEM_PEND_IN_LOCK LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x06)
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/**
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* @ingroup los_sem
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* Semaphore error code: The request for a semaphore times out.
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*
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* Value: 0x02000707
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*
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* Solution: Change the passed-in parameter value to the value within the valid range.
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*/
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#define LOS_ERRNO_SEM_TIMEOUT LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x07)
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/**
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* @ingroup los_sem
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* Semaphore error code: The times of semaphore release exceed the maximum times permitted.
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*
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* Value: 0x02000708
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*
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* Solution: Perform corresponding operations based on the requirements in the code context.
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*/
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#define LOS_ERRNO_SEM_OVERFLOW LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x08)
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/**
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* @ingroup los_sem
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* Semaphore error code: The queue of the tasks that are waiting on the semaphore control structure is not null.
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*
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* Value: 0x02000709
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*
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* Solution: Delete the semaphore after awaking all tasks that are waiting on the semaphore.
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*/
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#define LOS_ERRNO_SEM_PENDED LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x09)
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/**
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* @ingroup los_sem
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* Semaphore error code: The API is called in system-level callback, which is forbidden.
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* old usage: The API is called in software timer callback, which is forbidden. (LOS_ERRNO_SEM_PEND_SWTERR)
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* Value: 0x0200070A
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*
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* Solution: Do not call the API during an interrupt.
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*/
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#define LOS_ERRNO_SEM_PEND_IN_SYSTEM_TASK LOS_ERRNO_OS_ERROR(LOS_MOD_SEM, 0x0A)
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/**
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* @ingroup los_sem
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* Maximum number of semaphores.
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*
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*/
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#define OS_SEM_COUNT_MAX 0xFFFE
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/**
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* @ingroup los_sem
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* Maximum number of binary semaphores.
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*
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*/
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#define OS_SEM_BINARY_COUNT_MAX 1
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/**
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* @ingroup los_sem
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* @brief Create a semaphore.
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*
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* @par Description:
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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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* @attention
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* <ul>
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* <li>None.</li>
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* </ul>
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*
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* @param count [IN] Initial number of available semaphores. The value range is [0, OS_SEM_COUNT_MAX).
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* @param semHandle [OUT] ID of the semaphore control structure that is initialized.
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*
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* @retval #LOS_ERRNO_SEM_PTR_NULL The passed-in semHandle value is NULL.
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* @retval #LOS_ERRNO_SEM_OVERFLOW The passed-in count value is greater than the maximum number of available
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* semaphores.
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* @retval #LOS_ERRNO_SEM_ALL_BUSY No semaphore control structure is available.
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* @retval #LOS_OK The semaphore is successfully created.
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* @par Dependency:
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* <ul><li>los_sem.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_SemDelete
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*/
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extern UINT32 LOS_SemCreate(UINT16 count, UINT32 *semHandle);
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/**
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* @ingroup los_sem
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* @brief Create a binary semaphore.
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*
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* @par Description:
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* This API is used to create a binary semaphore control structure according to the initial number of
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* available semaphores specified by count and return the ID of this semaphore control structure.
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* @attention
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* <ul>
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* <li>None.</li>
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* </ul>
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*
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* @param count [IN] Initial number of available semaphores. The value range is [0, 1].
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* @param semHandle [OUT] ID of the semaphore control structure that is initialized.
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*
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* @retval #LOS_ERRNO_SEM_PTR_NULL The passed-in semHandle value is NULL.
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* @retval #LOS_ERRNO_SEM_OVERFLOW The passed-in count value is greater than the maximum number of
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* available semaphores.
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* @retval #LOS_ERRNO_SEM_ALL_BUSY No semaphore control structure is available.
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* @retval #LOS_OK The semaphore is successfully created.
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* @par Dependency:
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* <ul><li>los_sem.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_SemDelete
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*/
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extern UINT32 LOS_BinarySemCreate(UINT16 count, UINT32 *semHandle);
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/**
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* @ingroup los_sem
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* @brief Delete a semaphore.
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*
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* @par Description:
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* This API is used to delete a semaphore control structure that has an ID specified by semHandle.
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* @attention
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* <ul>
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* <li>The specified sem id must be created first. </li>
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* </ul>
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*
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* @param semHandle [IN] ID of the semaphore control structure to be deleted. The ID of the semaphore
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* control structure is obtained from semaphore creation.
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*
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* @retval #LOS_ERRNO_SEM_INVALID The passed-in semHandle value is invalid.
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* @retval #LOS_ERRNO_SEM_PENDED The queue of the tasks that are waiting on the semaphore control structure is
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* not null.
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* @retval #LOS_OK The semaphore control structure is successfully deleted.
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* @par Dependency:
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* <ul><li>los_sem.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_SemCreate
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*/
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extern UINT32 LOS_SemDelete(UINT32 semHandle);
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/**
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* @ingroup los_sem
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* @brief Request a semaphore.
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*
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* @par Description:
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* This API is used to request a semaphore based on the semaphore control structure ID specified by semHandle and the
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* parameter that specifies the timeout period.
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* @attention
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* <ul>
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* <li>The specified sem id must be created first. </li>
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* <li>Do not call this API in software timer callback. </li>
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* </ul>
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*
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* @param semHandle [IN] ID of the semaphore control structure to be requested. The ID of the semaphore control
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* structure is obtained from semaphore creation.
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* @param timeout [IN] Timeout interval for waiting on the semaphore. The value range is [0, 0xFFFFFFFF].
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* If the value is set to 0, the semaphore is not waited on. If the value is set to 0xFFFFFFFF,
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* the semaphore is waited on forever(unit: Tick).
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*
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* @retval #LOS_ERRNO_SEM_INVALID The passed-in semHandle value is invalid.
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* @retval #LOS_ERRNO_SEM_UNAVAILABLE There is no available semaphore resource.
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* @retval #LOS_ERRNO_SEM_PEND_INTERR The API is called during an interrupt, which is forbidden.
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* @retval #LOS_ERRNO_SEM_PEND_IN_LOCK The task is unable to request a semaphore because task scheduling is locked.
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* @retval #LOS_ERRNO_SEM_TIMEOUT The request for the semaphore times out.
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* @retval #LOS_OK The semaphore request succeeds.
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* @par Dependency:
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* <ul><li>los_sem.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_SemPost | LOS_SemCreate
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*/
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extern UINT32 LOS_SemPend(UINT32 semHandle, UINT32 timeout);
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/**
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* @ingroup los_sem
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* @brief Release a semaphore.
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*
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* @par Description:
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* This API is used to release a semaphore that has a semaphore control structure ID specified by semHandle.
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* @attention
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* <ul>
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* <li>The specified sem id must be created first. </li>
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* </ul>
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*
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* @param semHandle [IN] ID of the semaphore control structure to be released.The ID of the semaphore control
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* structure is obtained from semaphore creation.
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*
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* @retval #LOS_ERRNO_SEM_INVALID The passed-in semHandle value is invalid.
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* @retval #LOS_ERRNO_SEM_OVERFLOW The times of semaphore release exceed the maximum times permitted.
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* @retval #LOS_OK The semaphore is successfully released.
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* @par Dependency:
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* <ul><li>los_sem.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_SemPend | LOS_SemCreate
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*/
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extern UINT32 LOS_SemPost(UINT32 semHandle);
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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_H */
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