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72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
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/**
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******************************************************************************
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* @file pios_semaphore.h
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* @author Tau Labs, http://taulabs.org, Copyright (C) 2013-2014
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_Semaphore Semaphore Abstraction
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* @{
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* @brief Abstracts the concept of a binary semaphore to hide different implementations
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PIOS_SEMAPHORE_H_
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#define PIOS_SEMAPHORE_H_
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#define PIOS_SEMAPHORE_TIMEOUT_MAX 0xffffffff
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#include <stdint.h>
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#include <stdbool.h>
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struct pios_semaphore {
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#if defined(PIOS_INCLUDE_FREERTOS)
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uintptr_t sema_handle;
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#elif defined(PIOS_INCLUDE_CHIBIOS)
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BinarySemaphore sema;
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#elif defined(PIOS_INCLUDE_IRQ)
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uint32_t sema_count;
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#endif /* defined(PIOS_INCLUDE_IRQ) */
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};
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/*
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* The following functions implement the concept of a binary semaphore usable
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* with PIOS_INCLUDE_FREERTOS, PIOS_INCLUDE_CHIBIOS or PIOS_INCLUDE_IRQ.
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*
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* Note that this is not the same as:
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* - counting semaphore
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* - mutex
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* - recursive mutex
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*
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* see FreeRTOS documentation for details: http://www.freertos.org/a00113.html
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* see ChibiOS documentation for details: http://chibios.sourceforge.net/html/group__synchronization.html
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*/
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struct pios_semaphore *PIOS_Semaphore_Create(void);
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bool PIOS_Semaphore_Take(struct pios_semaphore *sema, uint32_t timeout_ms);
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bool PIOS_Semaphore_Give(struct pios_semaphore *sema);
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bool PIOS_Semaphore_Take_FromISR(struct pios_semaphore *sema, bool *woken);
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bool PIOS_Semaphore_Give_FromISR(struct pios_semaphore *sema, bool *woken);
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#endif /* PIOS_SEMAPHORE_H_ */
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/**
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* @}
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* @}
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*/
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