/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011,2012,2013 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT 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/RT 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 . */ /* Concepts and parts of this file have been contributed by Scott (skute). */ /** * @file chevents.h * @brief Events macros and structures. * * @addtogroup events * @{ */ #ifndef _CHEVENTS_H_ #define _CHEVENTS_H_ #if CH_CFG_USE_EVENTS || defined(__DOXYGEN__) /*===========================================================================*/ /* Module constants. */ /*===========================================================================*/ /*===========================================================================*/ /* Module pre-compile time settings. */ /*===========================================================================*/ /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ /*===========================================================================*/ /* Module data structures and types. */ /*===========================================================================*/ typedef struct event_listener event_listener_t; /** * @brief Event Listener structure. */ struct event_listener { event_listener_t *el_next; /**< @brief Next Event Listener registered on the event source. */ thread_t *el_listener; /**< @brief Thread interested in the event source. */ eventmask_t el_mask; /**< @brief Event identifiers mask. */ eventflags_t el_flags; /**< @brief Flags added to the listener by the event source.*/ }; /** * @brief Event Source structure. */ typedef struct event_source { event_listener_t *es_next; /**< @brief First Event Listener registered on the Event Source. */ } event_source_t; /** * @brief Event Handler callback function. */ typedef void (*evhandler_t)(eventid_t); /*===========================================================================*/ /* Module macros. */ /*===========================================================================*/ /** * @brief All events allowed mask. */ #define ALL_EVENTS ((eventmask_t)-1) /** * @brief Returns an event mask from an event identifier. */ #define EVENT_MASK(eid) ((eventmask_t)(1 << (eid))) /** * @brief Data part of a static event source initializer. * @details This macro should be used when statically initializing an event * source that is part of a bigger structure. * @param name the name of the event source variable */ #define _EVENTSOURCE_DATA(name) {(void *)(&name)} /** * @brief Static event source initializer. * @details Statically initialized event sources require no explicit * initialization using @p chEvtInit(). * * @param name the name of the event source variable */ #define EVENTSOURCE_DECL(name) event_source_t name = _EVENTSOURCE_DATA(name) /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #ifdef __cplusplus extern "C" { #endif void chEvtRegisterMask(event_source_t *esp, event_listener_t *elp, eventmask_t mask); void chEvtUnregister(event_source_t *esp, event_listener_t *elp); eventmask_t chEvtGetAndClearEvents(eventmask_t mask); eventmask_t chEvtAddEvents(eventmask_t mask); eventflags_t chEvtGetAndClearFlags(event_listener_t *elp); eventflags_t chEvtGetAndClearFlagsI(event_listener_t *elp); void chEvtSignal(thread_t *tp, eventmask_t mask); void chEvtSignalI(thread_t *tp, eventmask_t mask); void chEvtBroadcastFlags(event_source_t *esp, eventflags_t flags); void chEvtBroadcastFlagsI(event_source_t *esp, eventflags_t flags); void chEvtDispatch(const evhandler_t *handlers, eventmask_t mask); #if CH_CFG_OPTIMIZE_SPEED || !CH_CFG_USE_EVENTS_TIMEOUT eventmask_t chEvtWaitOne(eventmask_t mask); eventmask_t chEvtWaitAny(eventmask_t mask); eventmask_t chEvtWaitAll(eventmask_t mask); #endif #if CH_CFG_USE_EVENTS_TIMEOUT eventmask_t chEvtWaitOneTimeout(eventmask_t mask, systime_t time); eventmask_t chEvtWaitAnyTimeout(eventmask_t mask, systime_t time); eventmask_t chEvtWaitAllTimeout(eventmask_t mask, systime_t time); #endif #ifdef __cplusplus } #endif #if !CH_CFG_OPTIMIZE_SPEED && CH_CFG_USE_EVENTS_TIMEOUT #define chEvtWaitOne(mask) chEvtWaitOneTimeout(mask, TIME_INFINITE) #define chEvtWaitAny(mask) chEvtWaitAnyTimeout(mask, TIME_INFINITE) #define chEvtWaitAll(mask) chEvtWaitAllTimeout(mask, TIME_INFINITE) #endif /*===========================================================================*/ /* Module inline functions. */ /*===========================================================================*/ /** * @brief Initializes an Event Source. * @note This function can be invoked before the kernel is initialized * because it just prepares a @p event_source_t structure. * * @param[in] esp pointer to the @p event_source_t structure * * @init */ static inline void chEvtObjectInit(event_source_t *esp) { esp->es_next = (event_listener_t *)(void *)esp; } /** * @brief Registers an Event Listener on an Event Source. * @note Multiple Event Listeners can use the same event identifier, the * listener will share the callback function. * * @param[in] esp pointer to the @p event_source_t structure * @param[out] elp pointer to the @p event_listener_t structure * @param[in] eid numeric identifier assigned to the Event Listener. The * identifier is used as index for the event callback * function. * The value must range between zero and the size, in bit, * of the @p eventid_t type minus one. * * @api */ static inline void chEvtRegister(event_source_t *esp, event_listener_t *elp, eventid_t eid) { chEvtRegisterMask(esp, elp, EVENT_MASK(eid)); } /** * @brief Verifies if there is at least one @p event_listener_t registered. * * @param[in] esp pointer to the @p event_source_t structure * * @iclass */ static inline bool chEvtIsListeningI(event_source_t *esp) { return (bool)((void *)esp != (void *)esp->es_next); } /** * @brief Signals all the Event Listeners registered on the specified Event * Source. * * @param[in] esp pointer to the @p event_source_t structure * * @api */ static inline void chEvtBroadcast(event_source_t *esp) { chEvtBroadcastFlags(esp, 0); } /** * @brief Signals all the Event Listeners registered on the specified Event * Source. * @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. * * @param[in] esp pointer to the @p event_source_t structure * * @iclass */ static inline void chEvtBroadcastI(event_source_t *esp) { chEvtBroadcastFlagsI(esp, 0); } #endif /* CH_CFG_USE_EVENTS */ #endif /* _CHEVENTS_H_ */ /** @} */