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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/>.
*/
/**
* @addtogroup Events
* @{
*/
#ifndef _EVENTS_H_
#define _EVENTS_H_
#ifdef CH_USE_EVENTS
/** All events allowed mask.*/
#define ALL_EVENTS -1
typedef struct EventListener EventListener;
/**
* Event Listener structure.
*/
struct EventListener {
/** Next Event Listener registered on the Event Source.*/
EventListener *el_next;
/** Thread interested in the Event Source.*/
Thread *el_listener;
/** Event identifier associated by the thread to the Event Source.*/
eventid_t el_id;
};
/**
* Event Source structure.
*/
typedef struct EventSource {
/** First Event Listener registered on the Event Source.*/
EventListener *es_next;
} EventSource;
/** Returns the event mask from the event identifier.*/
#define EventMask(eid) (1 << (eid))
/**
* Initializes an Event Source.
* @param esp pointer to the \p EventSource structure
* @note Can be called with interrupts disabled or enabled.
*/
#define chEvtInit(esp) \
((esp)->es_next = (EventListener *)(void *)(esp))
/**
* Verifies if there is at least one \p EventListener registered on the
* \p EventSource.
* @param esp pointer to the \p EventSource structure
* @note Can be called with interrupts disabled or enabled.
*/
#define chEvtIsListening(esp) \
((esp) != (EventListener *)(void *)(esp)->es_next)
/** Event Handler callback function.*/
typedef void (*evhandler_t)(eventid_t);
#ifdef __cplusplus
extern "C" {
#endif
void chEvtRegister(EventSource *esp, EventListener *elp, eventid_t eid);
void chEvtUnregister(EventSource *esp, EventListener *elp);
void chEvtClear(eventmask_t mask);
void chEvtSend(EventSource *esp);
void chEvtSendI(EventSource *esp);
eventid_t chEvtWait(eventmask_t ewmask,
const evhandler_t handlers[]);
#ifdef CH_USE_EVENTS_TIMEOUT
eventid_t chEvtWaitTimeout(eventmask_t ewmask,
const evhandler_t handlers[],
systime_t time);
#endif
#ifdef __cplusplus
}
#endif
#endif /* CH_USE_EVENTS */
#endif /* _EVENTS_H_ */
/** @} */
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