From 48026bb824fd2d9cfb00ecd040db6ef3a416bae9 Mon Sep 17 00:00:00 2001 From: Clyne Sullivan Date: Fri, 22 Jan 2021 21:43:36 -0500 Subject: upload initial port --- ChibiOS_20.3.2/os/nil/include/chsem.h | 180 ++++++++++++++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100644 ChibiOS_20.3.2/os/nil/include/chsem.h (limited to 'ChibiOS_20.3.2/os/nil/include/chsem.h') diff --git a/ChibiOS_20.3.2/os/nil/include/chsem.h b/ChibiOS_20.3.2/os/nil/include/chsem.h new file mode 100644 index 0000000..7caad00 --- /dev/null +++ b/ChibiOS_20.3.2/os/nil/include/chsem.h @@ -0,0 +1,180 @@ +/* + ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio. + + This file is part of ChibiOS. + + ChibiOS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +/** + * @file nil/include/chsem.h + * @brief Nil RTOS semaphores header file. + * + * @addtogroup NIL_SEMAPHORES + * @{ + */ + +#ifndef CHSEM_H +#define CHSEM_H + +#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Module constants. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Module pre-compile time settings. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Derived constants and error checks. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Module data structures and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Module macros. */ +/*===========================================================================*/ + +/** + * @name Macro Functions + * @{ + */ +/** + * @brief Initializes a semaphore with the specified counter value. + * + * @param[out] sp pointer to a @p semaphore_t structure + * @param[in] n initial value of the semaphore counter. Must be + * non-negative. + * + * @init + */ +#define chSemObjectInit(sp, n) ((sp)->cnt = (n)) + +/** + * @brief Performs a reset operation on the semaphore. + * @post After invoking this function all the threads waiting on the + * semaphore, if any, are released and the semaphore counter is set + * to the specified, non negative, value. + * @note This function implicitly sends @p MSG_RESET as message. + * + * @param[in] sp pointer to a @p semaphore_t structure + * @param[in] n the new value of the semaphore counter. The value must + * be non-negative. + * + * @api + */ +#define chSemReset(sp, n) chSemResetWithMessage(sp, n, MSG_RESET) + +/** + * @brief Performs a reset operation on the semaphore. + * @post After invoking this function all the threads waiting on the + * semaphore, if any, are released and the semaphore counter is set + * to the specified, non negative, value. + * @post This function does not reschedule so a call to a rescheduling + * function must be performed before unlocking the kernel. Note that + * interrupt handlers always reschedule on exit so an explicit + * reschedule must not be performed in ISRs. + * @note This function implicitly sends @p MSG_RESET as message. + * + * @param[in] sp pointer to a @p semaphore_t structure + * @param[in] n the new value of the semaphore counter. The value must + * be non-negative. + * + * @iclass + */ +#define chSemResetI(sp, n) chSemResetWithMessageI(sp, n, MSG_RESET) + +/** + * @brief Performs a wait operation on a semaphore. + * + * @param[in] sp pointer to a @p semaphore_t structure + * @return A message specifying how the invoking thread has been + * released from the semaphore. + * @retval CH_MSG_OK if the thread has not stopped on the semaphore or the + * semaphore has been signaled. + * @retval CH_MSG_RST if the semaphore has been reset using @p chSemReset(). + * + * @api + */ +#define chSemWait(sp) chSemWaitTimeout(sp, TIME_INFINITE) + +/** + * @brief Performs a wait operation on a semaphore. + * + * @param[in] sp pointer to a @p semaphore_t structure + * @return A message specifying how the invoking thread has been + * released from the semaphore. + * @retval CH_MSG_OK if the thread has not stopped on the semaphore or the + * semaphore has been signaled. + * @retval CH_MSG_RST if the semaphore has been reset using @p chSemReset(). + * + * @sclass + */ +#define chSemWaitS(sp) chSemWaitTimeoutS(sp, TIME_INFINITE) + +/** + * @brief Decreases the semaphore counter. + * @details This macro can be used when the counter is known to be positive. + * + * @param[in] sp pointer to a @p semaphore_t structure + * + * @iclass + */ +#define chSemFastWaitI(sp) ((sp)->cnt--) + +/** + * @brief Increases the semaphore counter. + * @details This macro can be used when the counter is known to be not + * negative. + * + * @param[in] sp pointer to a @p semaphore_t structure + * + * @iclass + */ +#define chSemFastSignalI(sp) ((sp)->cnt++) + +/** + * @brief Returns the semaphore counter current value. + * + * @iclass + */ +#define chSemGetCounterI(sp) ((sp)->cnt) +/** @} */ + +/*===========================================================================*/ +/* External declarations. */ +/*===========================================================================*/ + +#ifdef __cplusplus +extern "C" { +#endif + msg_t chSemWaitTimeout(semaphore_t *sp, sysinterval_t timeout); + msg_t chSemWaitTimeoutS(semaphore_t *sp, sysinterval_t timeout); + void chSemSignal(semaphore_t *sp); + void chSemSignalI(semaphore_t *sp); + void chSemResetWithMessage(semaphore_t *sp, cnt_t n, msg_t msg); + void chSemResetWithMessageI(semaphore_t *sp, cnt_t n, msg_t msg); +#ifdef __cplusplus +} +#endif + +#endif /* CH_CFG_USE_SEMAPHORES == TRUE */ + +#endif /* CHSEM_H */ + +/** @} */ -- cgit v1.2.3