You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
604 lines
20 KiB
C
604 lines
20 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS.
|
|
|
|
ChibiOS 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 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 rt/src/chevents.c
|
|
* @brief Events code.
|
|
*
|
|
* @addtogroup events
|
|
* @details Event Flags, Event Sources and Event Listeners.
|
|
* <h2>Operation mode</h2>
|
|
* Each thread has a mask of pending events inside its
|
|
* @p thread_t structure.
|
|
* Operations defined for events:
|
|
* - <b>Wait</b>, the invoking thread goes to sleep until a certain
|
|
* AND/OR combination of events are signaled.
|
|
* - <b>Clear</b>, a mask of events is cleared from the pending
|
|
* events, the cleared events mask is returned (only the
|
|
* events that were actually pending and then cleared).
|
|
* - <b>Signal</b>, an events mask is directly ORed to the mask of
|
|
* the signaled thread.
|
|
* - <b>Broadcast</b>, each thread registered on an Event Source is
|
|
* signaled with the events specified in its Event Listener.
|
|
* - <b>Dispatch</b>, an events mask is scanned and for each bit set
|
|
* to one an associated handler function is invoked. Bit masks are
|
|
* scanned from bit zero upward.
|
|
* .
|
|
* An Event Source is a special object that can be "broadcasted" by
|
|
* a thread or an interrupt service routine. Broadcasting an Event
|
|
* Source has the effect that all the threads registered on the
|
|
* Event Source will be signaled with an events mask.<br>
|
|
* An unlimited number of Event Sources can exists in a system and
|
|
* each thread can be listening on an unlimited number of
|
|
* them.
|
|
* @pre In order to use the Events APIs the @p CH_CFG_USE_EVENTS option
|
|
* must be enabled in @p chconf.h.
|
|
* @post Enabling events requires 1-4 (depending on the architecture)
|
|
* extra bytes in the @p thread_t structure.
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
|
|
#if (CH_CFG_USE_EVENTS == TRUE) || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Module local definitions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local types. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Registers an Event Listener on an Event Source.
|
|
* @details Once a thread has registered as listener on an event source it
|
|
* will be notified of all events broadcasted there.
|
|
* @note Multiple Event Listeners can specify the same bits to be ORed to
|
|
* different threads.
|
|
*
|
|
* @param[in] esp pointer to the @p event_source_t structure
|
|
* @param[in] elp pointer to the @p event_listener_t structure
|
|
* @param[in] events events to be ORed to the thread when
|
|
* the event source is broadcasted
|
|
* @param[in] wflags mask of flags the listening thread is interested in
|
|
*
|
|
* @api
|
|
*/
|
|
void chEvtRegisterMaskWithFlags(event_source_t *esp,
|
|
event_listener_t *elp,
|
|
eventmask_t events,
|
|
eventflags_t wflags) {
|
|
|
|
chDbgCheck((esp != NULL) && (elp != NULL));
|
|
|
|
chSysLock();
|
|
elp->next = esp->next;
|
|
esp->next = elp;
|
|
elp->listener = currp;
|
|
elp->events = events;
|
|
elp->flags = (eventflags_t)0;
|
|
elp->wflags = wflags;
|
|
chSysUnlock();
|
|
}
|
|
|
|
/**
|
|
* @brief Unregisters an Event Listener from its Event Source.
|
|
* @note If the event listener is not registered on the specified event
|
|
* source then the function does nothing.
|
|
* @note For optimal performance it is better to perform the unregister
|
|
* operations in inverse order of the register operations (elements
|
|
* are found on top of the list).
|
|
*
|
|
* @param[in] esp pointer to the @p event_source_t structure
|
|
* @param[in] elp pointer to the @p event_listener_t structure
|
|
*
|
|
* @api
|
|
*/
|
|
void chEvtUnregister(event_source_t *esp, event_listener_t *elp) {
|
|
event_listener_t *p;
|
|
|
|
chDbgCheck((esp != NULL) && (elp != NULL));
|
|
|
|
/*lint -save -e9087 -e740 [11.3, 1.3] Cast required by list handling.*/
|
|
p = (event_listener_t *)esp;
|
|
/*lint -restore*/
|
|
chSysLock();
|
|
/*lint -save -e9087 -e740 [11.3, 1.3] Cast required by list handling.*/
|
|
while (p->next != (event_listener_t *)esp) {
|
|
/*lint -restore*/
|
|
if (p->next == elp) {
|
|
p->next = elp->next;
|
|
break;
|
|
}
|
|
p = p->next;
|
|
}
|
|
chSysUnlock();
|
|
}
|
|
|
|
/**
|
|
* @brief Clears the pending events specified in the events mask.
|
|
*
|
|
* @param[in] events the events to be cleared
|
|
* @return The mask of pending events that were cleared.
|
|
*
|
|
* @iclass
|
|
*/
|
|
eventmask_t chEvtGetAndClearEventsI(eventmask_t events) {
|
|
eventmask_t m;
|
|
|
|
m = currp->epending & events;
|
|
currp->epending &= ~events;
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Clears the pending events specified in the events mask.
|
|
*
|
|
* @param[in] events the events to be cleared
|
|
* @return The mask of pending events that were cleared.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtGetAndClearEvents(eventmask_t events) {
|
|
eventmask_t m;
|
|
|
|
chSysLock();
|
|
m = chEvtGetAndClearEventsI(events);
|
|
chSysUnlock();
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Adds (OR) a set of events to the current thread, this is
|
|
* @b much faster than using @p chEvtBroadcast() or @p chEvtSignal().
|
|
*
|
|
* @param[in] events the events to be added
|
|
* @return The mask of currently pending events.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtAddEvents(eventmask_t events) {
|
|
eventmask_t newevt;
|
|
|
|
chSysLock();
|
|
newevt = chEvtAddEventsI(events);
|
|
chSysUnlock();
|
|
|
|
return newevt;
|
|
}
|
|
|
|
/**
|
|
* @brief Signals all the Event Listeners registered on the specified Event
|
|
* Source.
|
|
* @details This function variants ORs the specified event flags to all the
|
|
* threads registered on the @p event_source_t in addition to the
|
|
* event flags specified by the threads themselves in the
|
|
* @p event_listener_t objects.
|
|
* @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
|
|
* @param[in] flags the flags set to be added to the listener flags mask
|
|
*
|
|
* @iclass
|
|
*/
|
|
void chEvtBroadcastFlagsI(event_source_t *esp, eventflags_t flags) {
|
|
event_listener_t *elp;
|
|
|
|
chDbgCheckClassI();
|
|
chDbgCheck(esp != NULL);
|
|
|
|
elp = esp->next;
|
|
/*lint -save -e9087 -e740 [11.3, 1.3] Cast required by list handling.*/
|
|
while (elp != (event_listener_t *)esp) {
|
|
/*lint -restore*/
|
|
elp->flags |= flags;
|
|
/* When flags == 0 the thread will always be signaled because the
|
|
source does not emit any flag.*/
|
|
if ((flags == (eventflags_t)0) ||
|
|
((flags & elp->wflags) != (eventflags_t)0)) {
|
|
chEvtSignalI(elp->listener, elp->events);
|
|
}
|
|
elp = elp->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the flags associated to an @p event_listener_t.
|
|
* @details The flags are returned and the @p event_listener_t flags mask is
|
|
* cleared.
|
|
*
|
|
* @param[in] elp pointer to the @p event_listener_t structure
|
|
* @return The flags added to the listener by the associated
|
|
* event source.
|
|
*
|
|
* @api
|
|
*/
|
|
eventflags_t chEvtGetAndClearFlags(event_listener_t *elp) {
|
|
eventflags_t flags;
|
|
|
|
chSysLock();
|
|
flags = elp->flags;
|
|
elp->flags = (eventflags_t)0;
|
|
chSysUnlock();
|
|
|
|
return flags & elp->wflags;
|
|
}
|
|
|
|
/**
|
|
* @brief Adds a set of event flags directly to the specified @p thread_t.
|
|
*
|
|
* @param[in] tp the thread to be signaled
|
|
* @param[in] events the events set to be ORed
|
|
*
|
|
* @api
|
|
*/
|
|
void chEvtSignal(thread_t *tp, eventmask_t events) {
|
|
|
|
chDbgCheck(tp != NULL);
|
|
|
|
chSysLock();
|
|
chEvtSignalI(tp, events);
|
|
chSchRescheduleS();
|
|
chSysUnlock();
|
|
}
|
|
|
|
/**
|
|
* @brief Adds a set of event flags directly to the specified @p thread_t.
|
|
* @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] tp the thread to be signaled
|
|
* @param[in] events the events set to be ORed
|
|
*
|
|
* @iclass
|
|
*/
|
|
void chEvtSignalI(thread_t *tp, eventmask_t events) {
|
|
|
|
chDbgCheckClassI();
|
|
chDbgCheck(tp != NULL);
|
|
|
|
tp->epending |= events;
|
|
/* Test on the AND/OR conditions wait states.*/
|
|
if (((tp->state == CH_STATE_WTOREVT) &&
|
|
((tp->epending & tp->u.ewmask) != (eventmask_t)0)) ||
|
|
((tp->state == CH_STATE_WTANDEVT) &&
|
|
((tp->epending & tp->u.ewmask) == tp->u.ewmask))) {
|
|
tp->u.rdymsg = MSG_OK;
|
|
(void) chSchReadyI(tp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Signals all the Event Listeners registered on the specified Event
|
|
* Source.
|
|
* @details This function variants ORs the specified event flags to all the
|
|
* threads registered on the @p event_source_t in addition to the
|
|
* event flags specified by the threads themselves in the
|
|
* @p event_listener_t objects.
|
|
*
|
|
* @param[in] esp pointer to the @p event_source_t structure
|
|
* @param[in] flags the flags set to be added to the listener flags mask
|
|
*
|
|
* @api
|
|
*/
|
|
void chEvtBroadcastFlags(event_source_t *esp, eventflags_t flags) {
|
|
|
|
chSysLock();
|
|
chEvtBroadcastFlagsI(esp, flags);
|
|
chSchRescheduleS();
|
|
chSysUnlock();
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the unmasked flags associated to an @p event_listener_t.
|
|
* @details The flags are returned and the @p event_listener_t flags mask is
|
|
* cleared.
|
|
*
|
|
* @param[in] elp pointer to the @p event_listener_t structure
|
|
* @return The flags added to the listener by the associated
|
|
* event source.
|
|
*
|
|
* @iclass
|
|
*/
|
|
eventflags_t chEvtGetAndClearFlagsI(event_listener_t *elp) {
|
|
eventflags_t flags;
|
|
|
|
flags = elp->flags;
|
|
elp->flags = (eventflags_t)0;
|
|
|
|
return flags & elp->wflags;
|
|
}
|
|
|
|
/**
|
|
* @brief Invokes the event handlers associated to an event flags mask.
|
|
*
|
|
* @param[in] events mask of events to be dispatched
|
|
* @param[in] handlers an array of @p evhandler_t. The array must have size
|
|
* equal to the number of bits in eventmask_t.
|
|
*
|
|
* @api
|
|
*/
|
|
void chEvtDispatch(const evhandler_t *handlers, eventmask_t events) {
|
|
eventid_t eid;
|
|
|
|
chDbgCheck(handlers != NULL);
|
|
|
|
eid = (eventid_t)0;
|
|
while (events != (eventmask_t)0) {
|
|
if ((events & EVENT_MASK(eid)) != (eventmask_t)0) {
|
|
chDbgAssert(handlers[eid] != NULL, "null handler");
|
|
events &= ~EVENT_MASK(eid);
|
|
handlers[eid](eid);
|
|
}
|
|
eid++;
|
|
}
|
|
}
|
|
|
|
#if (CH_CFG_OPTIMIZE_SPEED == TRUE) || \
|
|
(CH_CFG_USE_EVENTS_TIMEOUT == FALSE) || \
|
|
defined(__DOXYGEN__)
|
|
/**
|
|
* @brief Waits for exactly one of the specified events.
|
|
* @details The function waits for one event among those specified in
|
|
* @p events to become pending then the event is cleared and returned.
|
|
* @note One and only one event is served in the function, the one with the
|
|
* lowest event id. The function is meant to be invoked into a loop in
|
|
* order to serve all the pending events.<br>
|
|
* This means that Event Listeners with a lower event identifier have
|
|
* an higher priority.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS enables all the events
|
|
* @return The mask of the lowest event id served and cleared.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitOne(eventmask_t events) {
|
|
thread_t *ctp = currp;
|
|
eventmask_t m;
|
|
|
|
chSysLock();
|
|
m = ctp->epending & events;
|
|
if (m == (eventmask_t)0) {
|
|
ctp->u.ewmask = events;
|
|
chSchGoSleepS(CH_STATE_WTOREVT);
|
|
m = ctp->epending & events;
|
|
}
|
|
m ^= m & (m - (eventmask_t)1);
|
|
ctp->epending &= ~m;
|
|
chSysUnlock();
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Waits for any of the specified events.
|
|
* @details The function waits for any event among those specified in
|
|
* @p events to become pending then the events are cleared and
|
|
* returned.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS enables all the events
|
|
* @return The mask of the served and cleared events.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitAny(eventmask_t events) {
|
|
thread_t *ctp = currp;
|
|
eventmask_t m;
|
|
|
|
chSysLock();
|
|
m = ctp->epending & events;
|
|
if (m == (eventmask_t)0) {
|
|
ctp->u.ewmask = events;
|
|
chSchGoSleepS(CH_STATE_WTOREVT);
|
|
m = ctp->epending & events;
|
|
}
|
|
ctp->epending &= ~m;
|
|
chSysUnlock();
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Waits for all the specified events.
|
|
* @details The function waits for all the events specified in @p events to
|
|
* become pending then the events are cleared and returned.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS requires all the events
|
|
* @return The mask of the served and cleared events.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitAll(eventmask_t events) {
|
|
thread_t *ctp = currp;
|
|
|
|
chSysLock();
|
|
if ((ctp->epending & events) != events) {
|
|
ctp->u.ewmask = events;
|
|
chSchGoSleepS(CH_STATE_WTANDEVT);
|
|
}
|
|
ctp->epending &= ~events;
|
|
chSysUnlock();
|
|
|
|
return events;
|
|
}
|
|
#endif /* CH_CFG_OPTIMIZE_SPEED || !CH_CFG_USE_EVENTS_TIMEOUT */
|
|
|
|
#if (CH_CFG_USE_EVENTS_TIMEOUT == TRUE) || defined(__DOXYGEN__)
|
|
/**
|
|
* @brief Waits for exactly one of the specified events.
|
|
* @details The function waits for one event among those specified in
|
|
* @p events to become pending then the event is cleared and returned.
|
|
* @note One and only one event is served in the function, the one with the
|
|
* lowest event id. The function is meant to be invoked into a loop
|
|
* in order to serve all the pending events.<br>
|
|
* This means that Event Listeners with a lower event identifier have
|
|
* an higher priority.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS enables all the events
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The mask of the lowest event id served and cleared.
|
|
* @retval 0 if the operation has timed out.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitOneTimeout(eventmask_t events, sysinterval_t timeout) {
|
|
thread_t *ctp = currp;
|
|
eventmask_t m;
|
|
|
|
chSysLock();
|
|
m = ctp->epending & events;
|
|
if (m == (eventmask_t)0) {
|
|
if (TIME_IMMEDIATE == timeout) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
ctp->u.ewmask = events;
|
|
if (chSchGoSleepTimeoutS(CH_STATE_WTOREVT, timeout) < MSG_OK) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
m = ctp->epending & events;
|
|
}
|
|
m ^= m & (m - (eventmask_t)1);
|
|
ctp->epending &= ~m;
|
|
chSysUnlock();
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Waits for any of the specified events.
|
|
* @details The function waits for any event among those specified in
|
|
* @p events to become pending then the events are cleared and
|
|
* returned.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS enables all the events
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The mask of the served and cleared events.
|
|
* @retval 0 if the operation has timed out.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitAnyTimeout(eventmask_t events, sysinterval_t timeout) {
|
|
thread_t *ctp = currp;
|
|
eventmask_t m;
|
|
|
|
chSysLock();
|
|
m = ctp->epending & events;
|
|
if (m == (eventmask_t)0) {
|
|
if (TIME_IMMEDIATE == timeout) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
ctp->u.ewmask = events;
|
|
if (chSchGoSleepTimeoutS(CH_STATE_WTOREVT, timeout) < MSG_OK) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
m = ctp->epending & events;
|
|
}
|
|
ctp->epending &= ~m;
|
|
chSysUnlock();
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* @brief Waits for all the specified events.
|
|
* @details The function waits for all the events specified in @p events to
|
|
* become pending then the events are cleared and returned.
|
|
*
|
|
* @param[in] events events that the function should wait
|
|
* for, @p ALL_EVENTS requires all the events
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The mask of the served and cleared events.
|
|
* @retval 0 if the operation has timed out.
|
|
*
|
|
* @api
|
|
*/
|
|
eventmask_t chEvtWaitAllTimeout(eventmask_t events, sysinterval_t timeout) {
|
|
thread_t *ctp = currp;
|
|
|
|
chSysLock();
|
|
if ((ctp->epending & events) != events) {
|
|
if (TIME_IMMEDIATE == timeout) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
ctp->u.ewmask = events;
|
|
if (chSchGoSleepTimeoutS(CH_STATE_WTANDEVT, timeout) < MSG_OK) {
|
|
chSysUnlock();
|
|
return (eventmask_t)0;
|
|
}
|
|
}
|
|
ctp->epending &= ~events;
|
|
chSysUnlock();
|
|
|
|
return events;
|
|
}
|
|
#endif /* CH_CFG_USE_EVENTS_TIMEOUT == TRUE */
|
|
|
|
#endif /* CH_CFG_USE_EVENTS == TRUE */
|
|
|
|
/** @} */
|