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Event.h
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Event.h
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/* events
* Copyright (c) 2016 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef EVENT_H
#define EVENT_H
#include "events/EventQueue.h"
#include "platform/mbed_assert.h"
namespace events {
/** \addtogroup events */
/** Event
*
* Representation of an event for fine-grain dispatch control
* @ingroup events
*/
template <typename F>
class Event;
/** Event
*
* Representation of an event for fine-grain dispatch control
* @ingroup events
*/
template <>
class Event<void()> {
public:
/** Create an event
*
* Constructs an event bound to the specified event queue. The specified
* callback acts as the target for the event and is executed in the
* context of the event queue's dispatch loop once posted.
*
* @param q Event queue to dispatch on
* @param f Function to execute when the event is dispatched
* @param c0..c4 Arguments to bind to the callback, these arguments are
* allocated on an irq-safe allocator from the event queue's
* memory pool. Must be type-compatible with b0..b4, the
* arguments to the underlying callback.
*/
template <typename F>
Event(EventQueue *q, F f) {
_event = static_cast<struct event *>(
equeue_alloc(&q->_equeue, sizeof(struct event) + sizeof(F)));
if (_event) {
_event->equeue = &q->_equeue;
_event->id = 0;
_event->delay = 0;
_event->period = -1;
_event->post = &Event::event_post<F>;
_event->dtor = &Event::event_dtor<F>;
new (_event+1) F(f);
_event->ref = 1;
}
}
/** Copy constructor for events
*/
Event(const Event &e) {
_event = 0;
if (e._event) {
_event = e._event;
_event->ref += 1;
}
}
/** Assignment operator for events
*/
Event &operator=(const Event &that) {
if (this != &that) {
this->~Event();
new (this) Event(that);
}
return *this;
}
/** Destructor for events
*/
~Event() {
if (_event) {
_event->ref -= 1;
if (_event->ref == 0) {
_event->dtor(_event);
equeue_dealloc(_event->equeue, _event);
}
}
}
/** Configure the delay of an event
*
* @param delay Millisecond delay before dispatching the event
*/
void delay(int delay) {
if (_event) {
_event->delay = delay;
}
}
/** Configure the period of an event
*
* @param period Millisecond period for repeatedly dispatching an event
*/
void period(int period) {
if (_event) {
_event->period = period;
}
}
/** Posts an event onto the underlying event queue
*
* The event is posted to the underlying queue and is executed in the
* context of the event queue's dispatch loop.
*
* The post function is irq safe and can act as a mechanism for moving
* events out of irq contexts.
*
* @param a0..a4 Arguments to pass to the event
* @return A unique id that represents the posted event and can
* be passed to EventQueue::cancel, or an id of 0 if
* there is not enough memory to allocate the event.
*/
int post() const {
if (!_event) {
return 0;
}
_event->id = _event->post(_event);
return _event->id;
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void call() const {
MBED_UNUSED int id = post();
MBED_ASSERT(id);
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void operator()() const {
return call();
}
/** Static thunk for passing as C-style function
*
* @param func Event to call passed as a void pointer
* @param a0..a4 Arguments to pass to the event
*/
static void thunk(void *func) {
return static_cast<Event*>(func)->call();
}
/** Cancels the most recently posted event
*
* Attempts to cancel the most recently posted event. It is safe to call
* cancel after an event has already been dispatched.
*
* The cancel function is irq safe.
*
* If called while the event queue's dispatch loop is active, the cancel
* function does not garuntee that the event will not execute after it
* returns, as the event may have already begun executing.
*/
void cancel() const {
if (_event) {
equeue_cancel(_event->equeue, _event->id);
}
}
private:
struct event {
unsigned ref;
equeue_t *equeue;
int id;
int delay;
int period;
int (*post)(struct event *);
void (*dtor)(struct event *);
// F follows
} *_event;
// Event attributes
template <typename F>
static int event_post(struct event *e) {
typedef EventQueue::context00<F> C;
void *p = equeue_alloc(e->equeue, sizeof(C));
if (!p) {
return 0;
}
new (p) C(*(F*)(e + 1));
equeue_event_delay(p, e->delay);
equeue_event_period(p, e->period);
equeue_event_dtor(p, &EventQueue::function_dtor<C>);
return equeue_post(e->equeue, &EventQueue::function_call<C>, p);
}
template <typename F>
static void event_dtor(struct event *e) {
((F*)(e + 1))->~F();
}
public:
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0>
Event(EventQueue *q, F f, C0 c0) {
new (this) Event(q, EventQueue::context10<F, C0>(f, c0));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1>
Event(EventQueue *q, F f, C0 c0, C1 c1) {
new (this) Event(q, EventQueue::context20<F, C0, C1>(f, c0, c1));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2) {
new (this) Event(q, EventQueue::context30<F, C0, C1, C2>(f, c0, c1, c2));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2, typename C3>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2, C3 c3) {
new (this) Event(q, EventQueue::context40<F, C0, C1, C2, C3>(f, c0, c1, c2, c3));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2, typename C3, typename C4>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2, C3 c3, C4 c4) {
new (this) Event(q, EventQueue::context50<F, C0, C1, C2, C3, C4>(f, c0, c1, c2, c3, c4));
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, T *obj, R (T::*method)(B0), B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, const T *obj, R (T::*method)(B0) const, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0) volatile, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0) const volatile, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1), B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1) const, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1) volatile, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1) const volatile, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2), B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2) const, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2) volatile, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2) const volatile, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2, B3), B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2, B3) const, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2, B3) volatile, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2, B3) const volatile, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2, B3, B4), B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2, B3, B4) const, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2, B3, B4) volatile, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2, B3, B4) const volatile, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
};
/** Event
*
* Representation of an event for fine-grain dispatch control
* @ingroup events
*/
template <typename A0>
class Event<void(A0)> {
public:
/** Create an event
*
* Constructs an event bound to the specified event queue. The specified
* callback acts as the target for the event and is executed in the
* context of the event queue's dispatch loop once posted.
*
* @param q Event queue to dispatch on
* @param f Function to execute when the event is dispatched
* @param c0..c4 Arguments to bind to the callback, these arguments are
* allocated on an irq-safe allocator from the event queue's
* memory pool. Must be type-compatible with b0..b4, the
* arguments to the underlying callback.
*/
template <typename F>
Event(EventQueue *q, F f) {
_event = static_cast<struct event *>(
equeue_alloc(&q->_equeue, sizeof(struct event) + sizeof(F)));
if (_event) {
_event->equeue = &q->_equeue;
_event->id = 0;
_event->delay = 0;
_event->period = -1;
_event->post = &Event::event_post<F>;
_event->dtor = &Event::event_dtor<F>;
new (_event+1) F(f);
_event->ref = 1;
}
}
/** Copy constructor for events
*/
Event(const Event &e) {
_event = 0;
if (e._event) {
_event = e._event;
_event->ref += 1;
}
}
/** Assignment operator for events
*/
Event &operator=(const Event &that) {
if (this != &that) {
this->~Event();
new (this) Event(that);
}
return *this;
}
/** Destructor for events
*/
~Event() {
if (_event) {
_event->ref -= 1;
if (_event->ref == 0) {
_event->dtor(_event);
equeue_dealloc(_event->equeue, _event);
}
}
}
/** Configure the delay of an event
*
* @param delay Millisecond delay before dispatching the event
*/
void delay(int delay) {
if (_event) {
_event->delay = delay;
}
}
/** Configure the period of an event
*
* @param period Millisecond period for repeatedly dispatching an event
*/
void period(int period) {
if (_event) {
_event->period = period;
}
}
/** Posts an event onto the underlying event queue
*
* The event is posted to the underlying queue and is executed in the
* context of the event queue's dispatch loop.
*
* The post function is irq safe and can act as a mechanism for moving
* events out of irq contexts.
*
* @param a0..a4 Arguments to pass to the event
* @return A unique id that represents the posted event and can
* be passed to EventQueue::cancel, or an id of 0 if
* there is not enough memory to allocate the event.
*/
int post(A0 a0) const {
if (!_event) {
return 0;
}
_event->id = _event->post(_event, a0);
return _event->id;
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void call(A0 a0) const {
MBED_UNUSED int id = post(a0);
MBED_ASSERT(id);
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void operator()(A0 a0) const {
return call(a0);
}
/** Static thunk for passing as C-style function
*
* @param func Event to call passed as a void pointer
* @param a0..a4 Arguments to pass to the event
*/
static void thunk(void *func, A0 a0) {
return static_cast<Event*>(func)->call(a0);
}
/** Cancels the most recently posted event
*
* Attempts to cancel the most recently posted event. It is safe to call
* cancel after an event has already been dispatched.
*
* The cancel function is irq safe.
*
* If called while the event queue's dispatch loop is active, the cancel
* function does not garuntee that the event will not execute after it
* returns, as the event may have already begun executing.
*/
void cancel() const {
if (_event) {
equeue_cancel(_event->equeue, _event->id);
}
}
private:
struct event {
unsigned ref;
equeue_t *equeue;
int id;
int delay;
int period;
int (*post)(struct event *, A0 a0);
void (*dtor)(struct event *);
// F follows
} *_event;
// Event attributes
template <typename F>
static int event_post(struct event *e, A0 a0) {
typedef EventQueue::context10<F, A0> C;
void *p = equeue_alloc(e->equeue, sizeof(C));
if (!p) {
return 0;
}
new (p) C(*(F*)(e + 1), a0);
equeue_event_delay(p, e->delay);
equeue_event_period(p, e->period);
equeue_event_dtor(p, &EventQueue::function_dtor<C>);
return equeue_post(e->equeue, &EventQueue::function_call<C>, p);
}
template <typename F>
static void event_dtor(struct event *e) {
((F*)(e + 1))->~F();
}
public:
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0>
Event(EventQueue *q, F f, C0 c0) {
new (this) Event(q, EventQueue::context11<F, C0, A0>(f, c0));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1>
Event(EventQueue *q, F f, C0 c0, C1 c1) {
new (this) Event(q, EventQueue::context21<F, C0, C1, A0>(f, c0, c1));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2) {
new (this) Event(q, EventQueue::context31<F, C0, C1, C2, A0>(f, c0, c1, c2));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2, typename C3>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2, C3 c3) {
new (this) Event(q, EventQueue::context41<F, C0, C1, C2, C3, A0>(f, c0, c1, c2, c3));
}
/** Create an event
* @see Event::Event
*/
template <typename F, typename C0, typename C1, typename C2, typename C3, typename C4>
Event(EventQueue *q, F f, C0 c0, C1 c1, C2 c2, C3 c3, C4 c4) {
new (this) Event(q, EventQueue::context51<F, C0, C1, C2, C3, C4, A0>(f, c0, c1, c2, c3, c4));
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, T *obj, R (T::*method)(B0, A0), B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, A0) const, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, A0) volatile, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, A0) const volatile, B0 b0) {
new (this) Event(q, mbed::callback(obj, method), b0);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, A0), B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, A0) const, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, A0) volatile, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, A0) const volatile, B0 b0, B1 b1) {
new (this) Event(q, mbed::callback(obj, method), b0, b1);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2, A0), B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2, A0) const, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2, A0) volatile, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2, A0) const volatile, B0 b0, B1 b1, B2 b2) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2, B3, A0), B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2, B3, A0) const, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2, B3, A0) volatile, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2, B3, A0) const volatile, B0 b0, B1 b1, B2 b2, B3 b3) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, T *obj, R (T::*method)(B0, B1, B2, B3, B4, A0), B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, const T *obj, R (T::*method)(B0, B1, B2, B3, B4, A0) const, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, volatile T *obj, R (T::*method)(B0, B1, B2, B3, B4, A0) volatile, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
/** Create an event
* @see Event::Event
*/
template <typename T, typename R, typename B0, typename B1, typename B2, typename B3, typename B4>
Event(EventQueue *q, const volatile T *obj, R (T::*method)(B0, B1, B2, B3, B4, A0) const volatile, B0 b0, B1 b1, B2 b2, B3 b3, B4 b4) {
new (this) Event(q, mbed::callback(obj, method), b0, b1, b2, b3, b4);
}
};
/** Event
*
* Representation of an event for fine-grain dispatch control
* @ingroup events
*/
template <typename A0, typename A1>
class Event<void(A0, A1)> {
public:
/** Create an event
*
* Constructs an event bound to the specified event queue. The specified
* callback acts as the target for the event and is executed in the
* context of the event queue's dispatch loop once posted.
*
* @param q Event queue to dispatch on
* @param f Function to execute when the event is dispatched
* @param c0..c4 Arguments to bind to the callback, these arguments are
* allocated on an irq-safe allocator from the event queue's
* memory pool. Must be type-compatible with b0..b4, the
* arguments to the underlying callback.
*/
template <typename F>
Event(EventQueue *q, F f) {
_event = static_cast<struct event *>(
equeue_alloc(&q->_equeue, sizeof(struct event) + sizeof(F)));
if (_event) {
_event->equeue = &q->_equeue;
_event->id = 0;
_event->delay = 0;
_event->period = -1;
_event->post = &Event::event_post<F>;
_event->dtor = &Event::event_dtor<F>;
new (_event+1) F(f);
_event->ref = 1;
}
}
/** Copy constructor for events
*/
Event(const Event &e) {
_event = 0;
if (e._event) {
_event = e._event;
_event->ref += 1;
}
}
/** Assignment operator for events
*/
Event &operator=(const Event &that) {
if (this != &that) {
this->~Event();
new (this) Event(that);
}
return *this;
}
/** Destructor for events
*/
~Event() {
if (_event) {
_event->ref -= 1;
if (_event->ref == 0) {
_event->dtor(_event);
equeue_dealloc(_event->equeue, _event);
}
}
}
/** Configure the delay of an event
*
* @param delay Millisecond delay before dispatching the event
*/
void delay(int delay) {
if (_event) {
_event->delay = delay;
}
}
/** Configure the period of an event
*
* @param period Millisecond period for repeatedly dispatching an event
*/
void period(int period) {
if (_event) {
_event->period = period;
}
}
/** Posts an event onto the underlying event queue
*
* The event is posted to the underlying queue and is executed in the
* context of the event queue's dispatch loop.
*
* The post function is irq safe and can act as a mechanism for moving
* events out of irq contexts.
*
* @param a0..a4 Arguments to pass to the event
* @return A unique id that represents the posted event and can
* be passed to EventQueue::cancel, or an id of 0 if
* there is not enough memory to allocate the event.
*/
int post(A0 a0, A1 a1) const {
if (!_event) {
return 0;
}
_event->id = _event->post(_event, a0, a1);
return _event->id;
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void call(A0 a0, A1 a1) const {
MBED_UNUSED int id = post(a0, a1);
MBED_ASSERT(id);
}
/** Posts an event onto the underlying event queue, returning void
*
* @param a0..a4 Arguments to pass to the event
*/
void operator()(A0 a0, A1 a1) const {
return call(a0, a1);
}
/** Static thunk for passing as C-style function
*
* @param func Event to call passed as a void pointer
* @param a0..a4 Arguments to pass to the event
*/
static void thunk(void *func, A0 a0, A1 a1) {
return static_cast<Event*>(func)->call(a0, a1);
}
/** Cancels the most recently posted event
*
* Attempts to cancel the most recently posted event. It is safe to call
* cancel after an event has already been dispatched.
*
* The cancel function is irq safe.
*
* If called while the event queue's dispatch loop is active, the cancel
* function does not garuntee that the event will not execute after it
* returns, as the event may have already begun executing.
*/
void cancel() const {
if (_event) {
equeue_cancel(_event->equeue, _event->id);
}
}
private:
struct event {
unsigned ref;
equeue_t *equeue;
int id;
int delay;
int period;
int (*post)(struct event *, A0 a0, A1 a1);
void (*dtor)(struct event *);
// F follows
} *_event;