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/*
ChibiOS/RT - Copyright (C) 2006-2007 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/>.
*/
/**
* @file events.h
* @brief Events macros and structures.
*
* @addtogroup events
* @{
*/
#ifndef _EVENTS_H_
#define _EVENTS_H_
#if CH_USE_EVENTS
typedef struct EventListener EventListener;
/**
* @brief Event Listener structure.
*/
struct EventListener {
EventListener *el_next; /**< @brief Next Event Listener
registered on the Event
Source. */
Thread *el_listener; /**< @brief Thread interested in the
Event Source. */
eventmask_t el_mask; /**< @brief Event flags mask associated
by the thread to the Event
Source. */
};
/**
* @brief Event Source structure.
*/
typedef struct EventSource {
EventListener *es_next; /**< @brief First Event Listener
registered on the Event
Source. */
} EventSource;
/**
* @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) EventSource name = _EVENTSOURCE_DATA(name)
/** All events allowed mask.*/
#define ALL_EVENTS -1
/** Returns the event mask from the event identifier.*/
#define EVENT_MASK(eid) (1 << (eid))
/**
* @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 EventSource structure
* @param[out] elp pointer to the @p EventListener 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.
*/
#define chEvtRegister(esp, elp, eid) chEvtRegisterMask(esp, elp, EVENT_MASK(eid))
/**
* @brief Initializes an Event Source.
* @note Can be used with interrupts disabled or enabled.
*
* @param[in] esp pointer to the @p EventSource structure
*/
#define chEvtInit(esp) \
((esp)->es_next = (EventListener *)(void *)(esp))
/**
* @brief Verifies if there is at least one @p EventListener registered.
* @note Can be called with interrupts disabled or enabled.
*
* @param[in] esp pointer to the @p EventSource structure
*/
#define chEvtIsListening(esp) \
((void *)(esp) != (void *)(esp)->es_next)
/**
* @brief Event Handler callback function.
*/
typedef void (*evhandler_t)(eventid_t);
#ifdef __cplusplus
extern "C" {
#endif
void chEvtRegisterMask(EventSource *esp,
EventListener *elp,
eventmask_t mask);
void chEvtUnregister(EventSource *esp, EventListener *elp);
eventmask_t chEvtClear(eventmask_t mask);
eventmask_t chEvtPend(eventmask_t mask);
void chEvtSignal(Thread *tp, eventmask_t mask);
void chEvtSignalI(Thread *tp, eventmask_t mask);
void chEvtBroadcast(EventSource *esp);
void chEvtBroadcastI(EventSource *esp);
void chEvtDispatch(const evhandler_t handlers[], eventmask_t mask);
#if CH_OPTIMIZE_SPEED || !CH_USE_EVENTS_TIMEOUT
eventmask_t chEvtWaitOne(eventmask_t mask);
eventmask_t chEvtWaitAny(eventmask_t mask);
eventmask_t chEvtWaitAll(eventmask_t mask);
#endif
#if CH_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_OPTIMIZE_SPEED && CH_USE_EVENTS_TIMEOUT
#define chEvtWaitOne(ewmask) chEvtWaitOneTimeout(emask, TIME_INFINITE)
#define chEvtWaitAny(ewmask) chEvtWaitAnyTimeout(emask, TIME_INFINITE)
#define chEvtWaitAll(ewmask) chEvtWaitAllTimeout(emask, TIME_INFINITE)
#endif
#endif /* CH_USE_EVENTS */
#endif /* _EVENTS_H_ */
/** @} */
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