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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 ch.hpp
* @brief C++ wrapper classes and definitions.
*
* @addtogroup cpp_library
* @{
*/
#include <ch.h>
#ifndef _CH_HPP_
#define _CH_HPP_
namespace chibios_rt {
/**
* @brief Class encapsulating the base system functionalities.
*/
class System {
public:
/**
* @brief ChibiOS/RT initialization.
* @details The system is initialized, the idle thread is spawned and the
* current instruction flow becomes the main thread with priority
* @p NORMALPRIO.
*/
static void Init(void);
/**
* @brief Kernel lock.
* @note On some ports it is faster to invoke chSysLock() directly because
* inlining.
*/
static void Lock(void);
/**
* @brief Kernel unlock.
* @note On some ports it is faster to invoke chSysUnlock() directly
* because inlining.
*/
static void Unlock(void);
/**
* @brief Returns the system time as system ticks.
* @note The system tick time interval is implementation dependent.
*
* @return The system time.
*/
static systime_t GetTime(void);
};
/**
* @brief Timer class.
*/
class Timer {
public:
/**
* @brief Embedded @p VirtualTimer structure.
*/
struct ::VirtualTimer timer;
/**
* @brief Starts the timer.
* @note It must be called with the interrupts disabled.
* @note The associated function is invoked by an interrupt handler.
*
* @param[in] time the time in system ticks
* @param[in] vtfunc the timer callback function
* @param[in] par the parameter for the callback function
*/
void Set(systime_t time, vtfunc_t vtfunc, void *par);
/**
* @brief Resets the timer.
* @note It must be called with the interrupts disabled.
* @note The timer MUST be active when this function is invoked.
*/
void Reset();
/**
* @brief Returns the timer status.
*
* @retval TRUE The timer is armed.
* @retval FALSE The timer already fired its callback.
*/
bool IsArmed(void);
};
/**
* @brief Base class for a ChibiOS/RT thread.
* @details The thread body is the virtual function @p Main().
*/
class BaseThread {
public:
/**
* @brief Pointer to the system thread.
*/
::Thread *thread_ref;
/**
* @brief Thread constructor.
* @details The thread object is initialized and a system thread is
* started.
*
* @param[in] workspace pointer to the workspace area
* @param[in] wsize size of the workspace area
* @param[in] prio thread priority
*/
BaseThread(void *workspace, size_t wsize, tprio_t prio);
/**
* @brief Thread exit.
*
* @param[in] msg the exit message
*/
static void Exit(msg_t msg);
#if CH_USE_WAITEXIT
/**
* @brief Synchronization on Thread exit.
*
* @return The exit message from the thread.
*/
msg_t Wait(void);
#endif /* CH_USE_WAITEXIT */
/**
* @brief Resumes the thread.
* @details The thread encapsulated into the object is resumed.
*/
void Resume(void);
/**
* @brief Changes the thread priority.
*
* @param[in] newprio The new priority level
*/
static void SetPriority(tprio_t newprio);
/**
* @brief Requests thread termination.
* @details A termination flag is pended on the thread, it is thread
* responsibility to detect it and exit.
*/
void Terminate(void);
/**
* @brief Suspends the thread execution for the specified number of
* system ticks.
*
* @param[in] n the number of system ticks
*/
static void Sleep(systime_t n);
/**
* @brief Suspends the thread execution until the specified time arrives.
*
* @param[in] time the system time
*/
static void SleepUntil(systime_t time);
#if CH_USE_MESSAGES
/**
* @brief Sends a message to the thread and returns the answer.
*
* @param[in] tp the target thread
* @param[in] msg the sent message
* @return The returned message.
*/
static msg_t SendMessage(::Thread *tp, msg_t msg);
/**
* @brief Sends a message to the thread and returns the answer.
*
* @param[in] msg the sent message
* @return The returned message.
*/
msg_t SendMessage(msg_t msg);
/**
* @brief Waits for a message.
*
* @return The sebder thread.
*/
static Thread *WaitMessage(void);
/**
* @brief Returns an enqueued message or @p NULL.
*
* @param[in] tp the sender thread
* @return The incoming message.
*/
static msg_t GetMessage(Thread* tp);
/**
* @brief Releases the next message in queue with a reply.
*
* @param[in] tp the sender thread
* @param[in] msg the answer message
*/
static void ReleaseMessage(Thread* tp, msg_t msg);
/**
* @brief Returns true if there is at least one message in queue.
*
* @retval TRUE A message is waiting in queue.
* @retval FALSE A message is not waiting in queue.
*/
static bool IsPendingMessage(void);
#endif /* CH_USE_MESSAGES */
/**
* @brief Thread body function.
*
* @return The exit message.
*/
virtual msg_t Main(void);
};
/**
* @brief Enhanced threads template class.
* @details This class introduces thread names and static working area
* allocation.
*
* @param N the working area size for the thread class
*/
template <int N>
class EnhancedThread : public BaseThread {
protected:
WORKING_AREA(wa, N); // Thread working area.
public:
/**
* @brief The thread name.
*/
const char *name;
/**
* @brief Full constructor.
* @details This constructor allows to set a priority level for the new
* thread.
*
* @param[in] tname the name to be assigned to the thread
* @param[in] prio the priority to be assigned to the thread
*/
EnhancedThread(const char *tname, tprio_t prio) :
BaseThread(wa, sizeof wa, prio) {
name = tname;
}
/**
* @brief Simplified constructor.
* @details This constructor allows to create a thread by simply
* specifying a name. In is assumed @p NORMALPRIO as initial
* priority.
*
* @param[in] tname the name to be assigned to the thread
*/
EnhancedThread(const char *tname) :
BaseThread(wa, sizeof wa, NORMALPRIO) {
name = tname;
}
};
#if CH_USE_SEMAPHORES
/**
* @brief Class encapsulating a semaphore.
*/
class Semaphore {
public:
/**
* @brief Embedded @p ::Semaphore structure.
*/
struct ::Semaphore sem;
/**
* @brief Semaphore constructor.
* @details The embedded @p ::Semaphore structure is initialized.
*
* @param[in] n the semaphore counter value, must be greater
* or equal to zero
*/
Semaphore(cnt_t n);
/**
* @brief Resets a semaphore.
*
* @param[in] n the new semaphore counter value, must be
* greater or equal to zero
*/
void Reset(cnt_t n);
/**
* @brief Wait operation on the semaphore.
*
* @retval RDY_OK if the semaphore was signaled or not taken.
* @retval RDY_RESET if the semaphore was reset.
*/
msg_t Wait(void);
/**
* @brief Wait operation on the semaphore with timeout.
*
* @param[in] time the number of ticks before the operation fails
* @retval RDY_OK if the semaphore was signaled or not taken.
* @retval RDY_RESET if the semaphore was reset.
* @retval RDY_TIMEOUT if the semaphore was not signaled or reset
* within the specified timeout.
*/
msg_t WaitTimeout(systime_t time);
/**
* @brief Signal operation on the semaphore.
* @details The semaphore is signaled, the next thread in queue, if any,
* is awakened.
*/
void Signal(void);
#if CH_USE_SEMSW
/**
* @brief Atomic signal and wait operations.
*
* @param[in] ssem pointer to a @p Semaphore to be signaled
* @param[in] wsem pointer to a @p Semaphore to be wait on
* @retval RDY_OK if the semaphore was signaled or not taken.
* @retval RDY_RESET if the semaphore was reset.
*/
static msg_t SignalWait(Semaphore *ssem, Semaphore *wsem);
#endif /* CH_USE_SEMSW */
};
#endif /* CH_USE_SEMAPHORES */
#if CH_USE_MUTEXES
/**
* @brief Class encapsulating a mutex.
*/
class Mutex {
public:
/**
* @brief Embedded @p ::Mutex structure.
*/
struct ::Mutex mutex;
/**
* @brief Mutex constructor.
* @details The embedded @p ::Mutex structure is initialized.
*/
Mutex(void);
/**
* @brief Tries a lock operation on the mutex.
*
* @retval TRUE if the mutex was successfully acquired
* @retval FALSE if the lock attempt failed.
*/
bool TryLock(void);
/**
* @brief Locks the mutex.
* @details Performs a lock operation on the mutex, if the mutex is
* already locked then the thread enters the mutex priority
* queue and waits.
*/
void Lock(void);
/**
* @brief Unlocks the mutex.
* @details Performs an unlock operation on the mutex, the next waiting
* thread, if any, is resumed and locks the mutex.
*/
static void Unlock(void);
/**
* @brief Unlocks all the mutexes owned by the invoking thread.
* @details This operation is <b>MUCH MORE</b> efficient than releasing
* the mutexes one by one and not just because the call overhead,
* this function does not have any overhead related to the
* priority inheritance mechanism.
*/
static void UnlockAll(void);
};
#if CH_USE_CONDVARS
/**
* @brief Class encapsulating a conditional variable.
*/
class CondVar {
public:
/**
* @brief Embedded @p ::CondVar structure.
*/
struct ::CondVar condvar;
/**
* @brief CondVar constructor.
* @details The embedded @p ::CondVar structure is initialized.
*/
CondVar(void);
/**
* @brief Signals the CondVar.
* @details The next thread waiting on the @p CondVar, if any, is awakened.
*/
void Signal(void);
/**
* @brief Broadcasts the CondVar.
* @details All the threads waiting on the @p CondVar, if any, are awakened.
*/
void Broadcast(void);
/**
* @brief Waits on the CondVar while releasing the controlling mutex.
*
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using
* @p chCondSignal().
* @retval RDY_RESET if the condvar was signaled using
* @p chCondBroadcast().
*/
msg_t Wait(void);
#if CH_USE_CONDVARS_TIMEOUT
/**
* @brief Waits on the CondVar while releasing the controlling mutex.
*
* @param[in] time the number of ticks before the operation fails
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using
* @p chCondSignal().
* @retval RDY_RESET if the condvar was signaled using
* @p chCondBroadcast().
* @retval RDY_TIMEOUT if the condvar was not signaled within the
* specified timeout.
*/
msg_t WaitTimeout(systime_t time);
#endif /* CH_USE_CONDVARS_TIMEOUT */
};
#endif /* CH_USE_CONDVARS */
#endif /* CH_USE_MUTEXES */
#if CH_USE_EVENTS
/**
* @brief Class encapsulating an event source.
*/
class Event {
public:
/**
* @brief Embedded @p ::EventSource structure.
*/
struct ::EventSource event;
/**
* @brief Event constructor.
* @details The embedded @p ::EventSource structure is initialized.
*/
Event(void);
/**
* @brief Registers a listener on the event source.
*
* @param[in] elp pointer to the @p EventListener structure
* @param[in] eid numeric identifier assigned to the Event
* Listener
*/
void Register(EventListener *elp, eventid_t eid);
/**
* @brief Registers an Event Listener on an Event Source.
* @note Multiple Event Listeners can specify the same bits to be added.
*
* @param[in] elp pointer to the @p EventListener structure
* @param[in] emask the mask of event flags to be pended to the
* thread when the event source is broadcasted
*/
void RegisterMask(EventListener *elp, eventmask_t emask);
/**
* @brief Unregisters a listener.
* @details The specified listeners is no more signaled by the event
* source.
*
* @param[in] elp the listener to be unregistered
*/
void Unregister(EventListener *elp);
/**
* @brief Broadcasts an event.
* @details All the listeners registered on the event source are signaled.
*/
void Broadcast(void);
/**
* @brief Clears specified events from the pending events mask.
*
* @param[in] mask the events to be cleared
* @return The pending events that were cleared.
*/
static eventmask_t ClearFlags(eventmask_t mask);
/**
* @brief Makes an events mask pending in the current thread.
* @details This functon is @b much faster than using @p Broadcast().
*
* @param[in] mask the events to be pended
* @return The current pending events mask.
*/
static eventmask_t AddFlags(eventmask_t mask);
/**
* @brief Invokes the event handlers associated with a mask.
*
* @param[in] mask mask of the events to be dispatched
* @param[in] handlers an array of @p evhandler_t. The array must be
* have indexes from zero up the higher registered
* event identifier.
*/
static void Dispatch(const evhandler_t handlers[], eventmask_t mask);
/**
* @brief Waits for a single event.
* @details A pending event among those specified in @p ewmask is selected,
* cleared and its mask 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] ewmask mask of the events that the function should
* wait for, @p ALL_EVENTS enables all the events
* @return The mask of the lowest id served and cleared
* event.
*/
static eventmask_t WaitOne(eventmask_t ewmask);
/**
* @brief Waits for any of the specified events.
* @details The function waits for any event among those specified in
* @p ewmask to become pending then the events are cleared and
* returned.
*
* @param[in] ewmask mask of the events that the function should
* wait for, @p ALL_EVENTS enables all the events
* @return The mask of the served and cleared events.
*/
static eventmask_t WaitAny(eventmask_t ewmask);
/**
* @brief Waits for all the specified event flags then clears them.
* @details The function waits for all the events specified in @p ewmask
* to become pending then the events are cleared and returned.
*
* @param[in] ewmask mask of the event ids that the function should
* wait for
* @return The mask of the served and cleared events.
*/
static eventmask_t WaitAll(eventmask_t ewmask);
#if CH_USE_EVENTS_TIMEOUT
/**
* @brief Waits for a single event.
* @details A pending event among those specified in @p ewmask is selected,
* cleared and its mask 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] ewmask mask of the events that the function should
* wait for, @p ALL_EVENTS enables all the events
*
* @param[in] time the number of ticks before the operation timouts
* @return The mask of the lowest id served and cleared
* event.
* @retval 0 if the specified timeout expired.
*/
static eventmask_t WaitOneTimeout(eventmask_t ewmask, systime_t time);
/**
* @brief Waits for any of the specified events.
* @details The function waits for any event among those specified in
* @p ewmask to become pending then the events are cleared and
* returned.
*
* @param[in] ewmask mask of the events that the function should
* wait for, @p ALL_EVENTS enables all the events
* @param[in] time the number of ticks before the operation
* timouts
* @return The mask of the served and cleared events.
* @retval 0 if the specified timeout expired.
*/
static eventmask_t WaitAnyTimeout(eventmask_t ewmask, systime_t time);
/**
* @brief Waits for all the specified event flags then clears them.
* @details The function waits for all the events specified in @p ewmask
* to become pending then the events are cleared and returned.
*
* @param[in] ewmask mask of the event ids that the function should
* wait for
* @param[in] time the number of ticks before the operation
* timouts
* @return The mask of the served and cleared events.
* @retval 0 if the specified timeout expired.
*/
static eventmask_t WaitAllTimeout(eventmask_t ewmask, systime_t time);
#endif /* CH_USE_EVENTS_TIMEOUT */
};
#endif /* CH_USE_EVENTS */
}
#endif /* _CH_HPP_ */
/** @} */
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