Collaboration diagram for Virtual Timers:

Detailed Description

Time and Virtual Timers related APIs and services.

Functions
static void	vt_init (delta_list_t *dlhp)
	Delta list initialization. More...

static bool	vt_is_empty (delta_list_t *dlhp)
	List empty check. More...

static bool	vt_is_last (delta_list_t dlhp, delta_list_t dlp)
	Last timer in the list check. More...

static bool	vt_is_first (delta_list_t dlhp, delta_list_t dlp)
	Fist timer in the list check. More...

static bool	vt_is_timer (delta_list_t dlhp, delta_list_t dlp)
	Timer check. More...

static void	vt_insert_after (delta_list_t dlhp, delta_list_t dlp, sysinterval_t delta)
	Inserts an element after another header element. More...

static void	vt_insert_before (delta_list_t dlhp, delta_list_t dlp, sysinterval_t delta)
	Inserts an element before another header element. More...

static void	vt_insert (delta_list_t dlhp, delta_list_t dlep, sysinterval_t delta)
	Inserts an element in a delta list. More...

static delta_list_t *	vt_remove_first (delta_list_t *dlhp)
	Dequeues an element from the delta list. More...

static delta_list_t *	vt_dequeue (delta_list_t *dlp)
	Dequeues an element from the delta list. More...

static void	vt_set_alarm (systime_t now, sysinterval_t delay)
	Alarm time setup. More...

static void	vt_insert_first (virtual_timers_list_t vtlp, virtual_timer_t vtp, systime_t now, sysinterval_t delay)
	Inserts a timer as first element in a delta list. More...

static void	vt_enqueue (virtual_timers_list_t vtlp, virtual_timer_t vtp, sysinterval_t delay)
	Enqueues a virtual timer in a virtual timers list. More...

void	_vt_init (void)
	Virtual Timers initialization. More...

void	chVTDoSetI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a one-shot virtual timer. More...

void	chVTDoResetI (virtual_timer_t *vtp)
	Disables a Virtual Timer. More...

sysinterval_t	chVTGetRemainingIntervalI (virtual_timer_t *vtp)
	Returns the remaining time interval before next timer trigger. More...

void	chVTDoTickI (void)
	Virtual timers ticker. More...

static void	chVTObjectInit (virtual_timer_t *vtp)
	Initializes a `virtual_timer_t` object. More...

static systime_t	chVTGetSystemTimeX (void)
	Current system time. More...

static systime_t	chVTGetSystemTime (void)
	Current system time. More...

static sysinterval_t	chVTTimeElapsedSinceX (systime_t start)
	Returns the elapsed time since the specified start time. More...

static bool	chVTIsSystemTimeWithinX (systime_t start, systime_t end)
	Checks if the current system time is within the specified time window. More...

static bool	chVTIsSystemTimeWithin (systime_t start, systime_t end)
	Checks if the current system time is within the specified time window. More...

static bool	chVTGetTimersStateI (sysinterval_t *timep)
	Returns the time interval until the next timer event. More...

static bool	chVTIsArmedI (const virtual_timer_t *vtp)
	Returns `true` if the specified timer is armed. More...

static bool	chVTIsArmed (const virtual_timer_t *vtp)
	Returns `true` if the specified timer is armed. More...

static void	chVTResetI (virtual_timer_t *vtp)
	Disables a Virtual Timer. More...

static void	chVTReset (virtual_timer_t *vtp)
	Disables a Virtual Timer. More...

static void	chVTSetI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a virtual timer. More...

static void	chVTSet (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a virtual timer. More...

Function Documentation

◆ vt_init()

static void vt_init ( delta_list_t * dlhp )

inlinestatic

Delta list initialization.

Parameters

[out] dlhp pointer to the delta list header

Function Class:: Not an API, this function is for internal use only.

Definition at line 58 of file chvt.c.

References ch_delta_list::delta, ch_delta_list::next, and ch_delta_list::prev.

Referenced by _vt_init().

◆ vt_is_empty()

static bool vt_is_empty ( delta_list_t * dlhp )

inlinestatic

List empty check.

Parameters

[in] dlhp pointer to the delta list header

Function Class:: Not an API, this function is for internal use only.

Definition at line 72 of file chvt.c.

References ch_delta_list::next.

Referenced by chVTDoResetI(), chVTDoTickI(), and vt_enqueue().

◆ vt_is_last()

static bool vt_is_last	(	delta_list_t *	dlhp,
		delta_list_t *	dlp
	)

inlinestatic

Last timer in the list check.

Parameters

[in]	dlhp	pointer to the delta list header
[in]	dlp	pointer to the delta list element

Function Class:: Not an API, this function is for internal use only.

Definition at line 85 of file chvt.c.

References ch_delta_list::next.

◆ vt_is_first()

static bool vt_is_first	(	delta_list_t *	dlhp,
		delta_list_t *	dlp
	)

inlinestatic

Fist timer in the list check.

Parameters

[in]	dlhp	pointer to the delta list header
[in]	dlp	pointer to the delta list element

Function Class:: Not an API, this function is for internal use only.

Definition at line 98 of file chvt.c.

References ch_delta_list::next.

Referenced by chVTDoResetI().

◆ vt_is_timer()

static bool vt_is_timer	(	delta_list_t *	dlhp,
		delta_list_t *	dlp
	)

inlinestatic

Timer check.

Parameters

[in]	dlhp	pointer to the delta list header
[in]	dlp	pointer to the delta list element

Function Class:: Not an API, this function is for internal use only.

Definition at line 111 of file chvt.c.

◆ vt_insert_after()

static void vt_insert_after	(	delta_list_t *	dlhp,
		delta_list_t *	dlp,
		sysinterval_t	delta
	)

inlinestatic

Inserts an element after another header element.

Parameters

[in]	dlhp	pointer to the delta list header element
[in]	dlp	element to be inserted after the header element
[in]	delta	delta of the element to be inserted

Function Class:: Not an API, this function is for internal use only.

Definition at line 125 of file chvt.c.

References ch_delta_list::delta, ch_delta_list::next, and ch_delta_list::prev.

Referenced by vt_insert_first().

◆ vt_insert_before()

static void vt_insert_before	(	delta_list_t *	dlhp,
		delta_list_t *	dlp,
		sysinterval_t	delta
	)

inlinestatic

Inserts an element before another header element.

Parameters

[in]	dlhp	pointer to the delta list header element
[in]	dlp	element to be inserted before the header element
[in]	delta	delta of the element to be inserted

Function Class:: Not an API, this function is for internal use only.

Definition at line 145 of file chvt.c.

References ch_delta_list::delta, ch_delta_list::next, and ch_delta_list::prev.

Referenced by vt_insert().

◆ vt_insert()

static void vt_insert	(	delta_list_t *	dlhp,
		delta_list_t *	dlep,
		sysinterval_t	delta
	)

inlinestatic

Inserts an element in a delta list.

Parameters

[in]	dlhp	pointer to the delta list header element
[in]	dlep	element to be inserted before the header element
[in]	delta	delta of the element to be inserted

Function Class:: Not an API, this function is for internal use only.

Definition at line 165 of file chvt.c.

References chDbgAssert, ch_delta_list::delta, ch_delta_list::next, and vt_insert_before().

Referenced by vt_enqueue().

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◆ vt_remove_first()

static delta_list_t* vt_remove_first ( delta_list_t * dlhp )

inlinestatic

Dequeues an element from the delta list.

Parameters

[in] dlhp pointer to the delta list header

Function Class:: Not an API, this function is for internal use only.

Definition at line 200 of file chvt.c.

References ch_delta_list::next, and ch_delta_list::prev.

Referenced by chVTDoResetI().

◆ vt_dequeue()

static delta_list_t* vt_dequeue ( delta_list_t * dlp )

inlinestatic

Dequeues an element from the delta list.

Parameters

[in] dlp pointer to the delta list element

Function Class:: Not an API, this function is for internal use only.

Definition at line 216 of file chvt.c.

References ch_delta_list::next, and ch_delta_list::prev.

Referenced by chVTDoResetI(), and chVTDoTickI().

◆ vt_set_alarm()

static void vt_set_alarm	(	systime_t	now,
		sysinterval_t	delay
	)

static

Alarm time setup.

Note: An RFCU fault is registered if the system time skips past (now + delay), the deadline is skipped forward in order to compensate for the event.

Parameters

[in]	now	last known system time
[in]	delay	delay over `now`

Definition at line 234 of file chvt.c.

References CH_CFG_ST_TIMEDELTA, chDbgAssert, chTimeAddX(), chTimeDiffX(), chVTGetSystemTimeX(), and TIME_MAX_SYSTIME.

Referenced by chVTDoResetI(), chVTDoTickI(), and vt_enqueue().

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◆ vt_insert_first()

static void vt_insert_first	(	virtual_timers_list_t *	vtlp,
		virtual_timer_t *	vtp,
		systime_t	now,
		sysinterval_t	delay
	)

static

Inserts a timer as first element in a delta list.

Note: This is the special case when the delta list is initially empty.

Definition at line 288 of file chvt.c.

References CH_CFG_ST_TIMEDELTA, chDbgAssert, chTimeAddX(), chTimeDiffX(), chVTGetSystemTimeX(), ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, TIME_MAX_SYSTIME, and vt_insert_after().

Referenced by vt_enqueue().

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◆ vt_enqueue()

static void vt_enqueue	(	virtual_timers_list_t *	vtlp,
		virtual_timer_t *	vtp,
		sysinterval_t	delay
	)

static

Enqueues a virtual timer in a virtual timers list.

Definition at line 350 of file chvt.c.

References chTimeDiffX(), chVTGetSystemTimeX(), ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, vt_insert(), vt_insert_first(), vt_is_empty(), and vt_set_alarm().

Referenced by chVTDoSetI().

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◆ _vt_init()

void _vt_init ( void )

Virtual Timers initialization.

Note: Internal use only.

Function Class:: Not an API, this function is for internal use only.

Definition at line 406 of file chvt.c.

References ch, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, ch_virtual_timers_list::systime, vt_init(), and ch_system::vtlist.

Referenced by chSysInit().

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◆ chVTDoSetI()

void chVTDoSetI	(	virtual_timer_t *	vtp,
		sysinterval_t	delay,
		vtfunc_t	vtfunc,
		void *	par
	)

Enables a one-shot virtual timer.

The timer is enabled and programmed to trigger after the delay specified as parameter.

Precondition: The timer must not be already armed before calling this function.

Note: The callback function is invoked from interrupt context.

Parameters

[out]	vtp	the `virtual_timer_t` structure pointer
[in]	delay	the number of ticks before the operation timeouts, the special values are handled as follow: TIME_INFINITE is allowed but interpreted as a normal time specification. TIME_IMMEDIATE this value is not allowed.
[in]	vtfunc	the timer callback function. After invoking the callback the timer is disabled and the structure can be disposed or reused.
[in]	par	a parameter that will be passed to the callback function

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 438 of file chvt.c.

References ch, chDbgCheck, chDbgCheckClassI(), ch_virtual_timer::func, ch_virtual_timer::par, TIME_IMMEDIATE, vt_enqueue(), and ch_system::vtlist.

Referenced by chSchGoSleepTimeoutS(), and chVTSetI().

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◆ chVTDoResetI()

void chVTDoResetI ( virtual_timer_t * vtp )

Disables a Virtual Timer.

Precondition: The timer must be in armed state before calling this function.

Parameters

[in] vtp the virtual_timer_t structure pointer

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 461 of file chvt.c.

References ch, chDbgAssert, chDbgCheck, chDbgCheckClassI(), chTimeDiffX(), chVTGetSystemTimeX(), chVTIsArmedI(), ch_delta_list::delta, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timer::func, ch_virtual_timers_list::lasttime, ch_delta_list::next, vt_dequeue(), vt_is_empty(), vt_is_first(), vt_remove_first(), vt_set_alarm(), and ch_system::vtlist.

Referenced by chVTResetI().

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◆ chVTGetRemainingIntervalI()

sysinterval_t chVTGetRemainingIntervalI ( virtual_timer_t * vtp )

Returns the remaining time interval before next timer trigger.

Note: This function can be called while the timer is active.

Parameters

[in] vtp the virtual_timer_t structure pointer

Returns: The remaining time interval.

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 544 of file chvt.c.

References ch, chDbgAssert, chDbgCheckClassI(), chTimeDiffX(), chVTGetSystemTimeX(), ch_delta_list::delta, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, ch_delta_list::next, and ch_system::vtlist.

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◆ chVTDoTickI()

void chVTDoTickI ( void )

Virtual timers ticker.

Note: The system lock is released before entering the callback and re-acquired immediately after. It is callback's responsibility to acquire the lock if needed. This is done in order to reduce interrupts jitter when many timers are in use.

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 584 of file chvt.c.

References ch, chDbgCheckClassI(), chSysLockFromISR(), chSysUnlockFromISR(), chTimeAddX(), chTimeDiffX(), chVTGetSystemTimeX(), ch_delta_list::delta, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timer::func, ch_virtual_timers_list::lasttime, ch_delta_list::next, ch_virtual_timer::par, ch_virtual_timers_list::systime, vt_dequeue(), vt_is_empty(), vt_set_alarm(), and ch_system::vtlist.

Referenced by chSysTimerHandlerI().

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◆ chVTObjectInit()

static void chVTObjectInit ( virtual_timer_t * vtp )

inlinestatic

Initializes a virtual_timer_t object.

Note: Initializing a timer object is not strictly required because the function chVTSetI() initializes the object too. This function is only useful if you need to perform a chVTIsArmed() check before calling chVTSetI().

Parameters

[out] vtp the virtual_timer_t structure pointer

Function Class:: Initializer, this function just initializes an object and can be invoked before the kernel is initialized.

Definition at line 98 of file chvt.h.

References ch_virtual_timer::func.

◆ chVTGetSystemTimeX()

static systime_t chVTGetSystemTimeX ( void )

inlinestatic

Current system time.

Returns the number of system ticks since the chSysInit() invocation.

Note: The counter can reach its maximum and then restart from zero.; This function can be called from any context but its atomicity is not guaranteed on architectures whose word size is less than systime_t size.

Returns: The system time in ticks.

Function Class:: This is an X-Class API, this function can be invoked from any context.

Definition at line 116 of file chvt.h.

References ch, ch_virtual_timers_list::systime, and ch_system::vtlist.

Referenced by chThdSleepUntil(), chThdSleepUntilWindowed(), chVTDoResetI(), chVTDoTickI(), chVTGetRemainingIntervalI(), chVTGetSystemTime(), chVTGetTimersStateI(), chVTIsSystemTimeWithinX(), chVTTimeElapsedSinceX(), trace_next(), vt_enqueue(), vt_insert_first(), and vt_set_alarm().

◆ chVTGetSystemTime()

static systime_t chVTGetSystemTime ( void )

inlinestatic

Current system time.

Returns the number of system ticks since the chSysInit() invocation.

Note: The counter can reach its maximum and then restart from zero.

Returns: The system time in ticks.

Function Class:: Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 135 of file chvt.h.

References chSysLock(), chSysUnlock(), and chVTGetSystemTimeX().

Referenced by chVTIsSystemTimeWithin().

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◆ chVTTimeElapsedSinceX()

static sysinterval_t chVTTimeElapsedSinceX ( systime_t start )

inlinestatic

Returns the elapsed time since the specified start time.

Parameters

[in] start start time

Returns: The elapsed time.

Function Class:: This is an X-Class API, this function can be invoked from any context.

Definition at line 153 of file chvt.h.

References chTimeDiffX(), and chVTGetSystemTimeX().

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◆ chVTIsSystemTimeWithinX()

static bool chVTIsSystemTimeWithinX	(	systime_t	start,
		systime_t	end
	)

inlinestatic

Checks if the current system time is within the specified time window.

Note: When start==end then the function returns always false because the time window has zero size.

Parameters

[in]	start	the start of the time window (inclusive)
[in]	end	the end of the time window (non inclusive)

Return values

true	current time within the specified time window.
false	current time not within the specified time window.

Function Class:: This is an X-Class API, this function can be invoked from any context.

Definition at line 171 of file chvt.h.

References chTimeIsInRangeX(), and chVTGetSystemTimeX().

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◆ chVTIsSystemTimeWithin()

static bool chVTIsSystemTimeWithin	(	systime_t	start,
		systime_t	end
	)

inlinestatic

Checks if the current system time is within the specified time window.

Note: When start==end then the function returns always false because the time window has zero size.

Parameters

[in]	start	the start of the time window (inclusive)
[in]	end	the end of the time window (non inclusive)

Return values

true	current time within the specified time window.
false	current time not within the specified time window.

Function Class:: Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 189 of file chvt.h.

References chTimeIsInRangeX(), and chVTGetSystemTime().

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◆ chVTGetTimersStateI()

static bool chVTGetTimersStateI ( sysinterval_t * timep )

inlinestatic

Returns the time interval until the next timer event.

Note: The return value is not perfectly accurate and can report values in excess of CH_CFG_ST_TIMEDELTA ticks.; The interval returned by this function is only meaningful if more timers are not added to the list until the returned time.

Parameters

[out] timep pointer to a variable that will contain the time interval until the next timer elapses. This pointer can be NULL if the information is not required.

Returns: The time, in ticks, until next time event.

Return values

false	if the timers list is empty.
true	if the timers list contains at least one timer.

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 210 of file chvt.h.

References ch, CH_CFG_ST_TIMEDELTA, chDbgCheckClassI(), chTimeDiffX(), chVTGetSystemTimeX(), ch_delta_list::delta, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, ch_delta_list::next, and ch_system::vtlist.

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◆ chVTIsArmedI()

static bool chVTIsArmedI ( const virtual_timer_t * vtp )

inlinestatic

Returns true if the specified timer is armed.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in] vtp the virtual_timer_t structure pointer

Returns: true if the timer is armed.

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 242 of file chvt.h.

References chDbgCheckClassI(), and ch_virtual_timer::func.

Referenced by chVTDoResetI(), chVTIsArmed(), and chVTResetI().

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◆ chVTIsArmed()

static bool chVTIsArmed ( const virtual_timer_t * vtp )

inlinestatic

Returns true if the specified timer is armed.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in] vtp the virtual_timer_t structure pointer

Returns: true if the timer is armed.

Function Class:: Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 259 of file chvt.h.

References chSysLock(), chSysUnlock(), and chVTIsArmedI().

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◆ chVTResetI()

static void chVTResetI ( virtual_timer_t * vtp )

inlinestatic

Disables a Virtual Timer.

Note: The timer is first checked and disabled only if armed.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in] vtp the virtual_timer_t structure pointer

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 279 of file chvt.h.

References chVTDoResetI(), and chVTIsArmedI().

Referenced by chVTReset(), and chVTSetI().

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◆ chVTReset()

static void chVTReset ( virtual_timer_t * vtp )

inlinestatic

Disables a Virtual Timer.

Note: The timer is first checked and disabled only if armed.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in] vtp the virtual_timer_t structure pointer

Function Class:: Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 296 of file chvt.h.

References chSysLock(), chSysUnlock(), and chVTResetI().

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◆ chVTSetI()

static void chVTSetI	(	virtual_timer_t *	vtp,
		sysinterval_t	delay,
		vtfunc_t	vtfunc,
		void *	par
	)

inlinestatic

Enables a virtual timer.

If the virtual timer was already enabled then it is re-enabled using the new parameters.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in]	vtp	the `virtual_timer_t` structure pointer
[in]	delay	the number of ticks before the operation timeouts, the special values are handled as follow: TIME_INFINITE is allowed but interpreted as a normal time specification. TIME_IMMEDIATE this value is not allowed.
[in]	vtfunc	the timer callback function. After invoking the callback the timer is disabled and the structure can be disposed or reused.
[in]	par	a parameter that will be passed to the callback function

Function Class:: This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 325 of file chvt.h.

References chVTDoSetI(), and chVTResetI().

Referenced by chVTSet().

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◆ chVTSet()

static void chVTSet	(	virtual_timer_t *	vtp,
		sysinterval_t	delay,
		vtfunc_t	vtfunc,
		void *	par
	)

inlinestatic

Enables a virtual timer.

If the virtual timer was already enabled then it is re-enabled using the new parameters.

Precondition: The timer must have been initialized using chVTObjectInit() or chVTDoSetI().

Parameters

[in]	vtp	the `virtual_timer_t` structure pointer
[in]	delay	the number of ticks before the operation timeouts, the special values are handled as follow: TIME_INFINITE is allowed but interpreted as a normal time specification. TIME_IMMEDIATE this value is not allowed.
[in]	vtfunc	the timer callback function. After invoking the callback the timer is disabled and the structure can be disposed or reused.
[in]	par	a parameter that will be passed to the callback function

Function Class:: Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 354 of file chvt.h.

References chSysLock(), chSysUnlock(), and chVTSetI().

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Detailed Description

Functions

Function Documentation

◆ vt_init()

◆ vt_is_empty()

◆ vt_is_last()

◆ vt_is_first()

◆ vt_is_timer()

◆ vt_insert_after()

◆ vt_insert_before()

◆ vt_insert()

◆ vt_remove_first()

◆ vt_dequeue()

◆ vt_set_alarm()

◆ vt_insert_first()

◆ vt_enqueue()

◆ _vt_init()

◆ chVTDoSetI()

◆ chVTDoResetI()

◆ chVTGetRemainingIntervalI()

◆ chVTDoTickI()

◆ chVTObjectInit()

◆ chVTGetSystemTimeX()

◆ chVTGetSystemTime()

◆ chVTTimeElapsedSinceX()

◆ chVTIsSystemTimeWithinX()

◆ chVTIsSystemTimeWithin()

◆ chVTGetTimersStateI()

◆ chVTIsArmedI()

◆ chVTIsArmed()

◆ chVTResetI()

◆ chVTReset()

◆ chVTSetI()

◆ chVTSet()