chevents.h
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file chevents.h
* @brief Events macros and structures.
*
* @addtogroup events
* @{
*/
#ifndef _CHEVENTS_H_
#define _CHEVENTS_H_
#if CH_USE_EVENTS || defined(__DOXYGEN__)
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 Event Handler callback function.
*/
typedef void (*evhandler_t)(eventid_t);
/**
* @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)
/**
* @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)))
/**
* @name Macro Functions
* @{
*/
/**
* @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.
*
* @api
*/
#define chEvtRegister(esp, elp, eid) \
chEvtRegisterMask(esp, elp, EVENT_MASK(eid))
/**
* @brief Initializes an Event Source.
* @note This function can be invoked before the kernel is initialized
* because it just prepares a @p EventSource structure.
*
* @param[in] esp pointer to the @p EventSource structure
*
* @init
*/
#define chEvtInit(esp) \
((esp)->es_next = (EventListener *)(void *)(esp))
/**
* @brief Verifies if there is at least one @p EventListener registered.
*
* @param[in] esp pointer to the @p EventSource structure
*
* @iclass
*/
#define chEvtIsListeningI(esp) \
((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 EventSource structure
*
* @api
*/
#define chEvtBroadcast(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 EventSource structure
*
* @iclass
*/
#define chEvtBroadcastI(esp) chEvtBroadcastFlagsI(esp, 0)
/** @} */
#ifdef __cplusplus
extern "C" {
#endif
void chEvtRegisterMask(EventSource *esp,
EventListener *elp,
eventmask_t mask);
void chEvtUnregister(EventSource *esp, EventListener *elp);
eventmask_t chEvtClearFlags(eventmask_t mask);
eventmask_t chEvtAddFlags(eventmask_t mask);
void chEvtSignalFlags(Thread *tp, eventmask_t mask);
void chEvtSignalFlagsI(Thread *tp, eventmask_t mask);
void chEvtBroadcastFlags(EventSource *esp, eventmask_t mask);
void chEvtBroadcastFlagsI(EventSource *esp, eventmask_t mask);
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(mask) chEvtWaitOneTimeout(mask, TIME_INFINITE)
#define chEvtWaitAny(mask) chEvtWaitAnyTimeout(mask, TIME_INFINITE)
#define chEvtWaitAll(mask) chEvtWaitAllTimeout(mask, TIME_INFINITE)
#endif
#endif /* CH_USE_EVENTS */
#endif /* _CHEVENTS_H_ */
/** @} */