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/*
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 <http://www.gnu.org/licenses/>.
*/
/*
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_ */
/** @} */
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