Detailed Description

Time and Virtual Timers related APIs and services.

Collaboration diagram for Virtual Timers:

Functions
static void	vt_set_alarm (systime_t now, sysinterval_t delay)
	Alarm time setup.
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.
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.
void	chVTDoSetI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a one-shot virtual timer.
void	chVTDoSetContinuousI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a continuous virtual timer.
void	chVTDoResetI (virtual_timer_t *vtp)
	Disables a Virtual Timer.
sysinterval_t	chVTGetRemainingIntervalI (virtual_timer_t *vtp)
	Returns the remaining time interval before next timer trigger.
void	chVTDoTickI (void)
	Virtual timers ticker.
systimestamp_t	chVTGetTimeStampI (void)
	Generates a monotonic time stamp.
void	chVTResetTimeStampI (void)
	Resets and re-synchronizes the time stamps monotonic counter.
static void	chVTObjectInit (virtual_timer_t *vtp)
	Initializes a `virtual_timer_t` object.
static systime_t	chVTGetSystemTimeX (void)
	Current system time.
static systime_t	chVTGetSystemTime (void)
	Current system time.
static sysinterval_t	chVTTimeElapsedSinceX (systime_t start)
	Returns the elapsed time since the specified start time.
static bool	chVTIsSystemTimeWithinX (systime_t start, systime_t end)
	Checks if the current system time is within the specified time window.
static bool	chVTIsSystemTimeWithin (systime_t start, systime_t end)
	Checks if the current system time is within the specified time window.
static bool	chVTGetTimersStateI (sysinterval_t *timep)
	Returns the time interval until the next timer event.
static bool	chVTIsArmedI (const virtual_timer_t *vtp)
	Returns `true` if the specified timer is armed.
static bool	chVTIsArmed (const virtual_timer_t *vtp)
	Returns `true` if the specified timer is armed.
static void	chVTResetI (virtual_timer_t *vtp)
	Disables a Virtual Timer.
static void	chVTReset (virtual_timer_t *vtp)
	Disables a Virtual Timer.
static void	chVTSetI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a one-shot virtual timer.
static void	chVTSet (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a one-shot virtual timer.
static void	chVTSetContinuousI (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a continuous virtual timer.
static void	chVTSetContinuous (virtual_timer_t vtp, sysinterval_t delay, vtfunc_t vtfunc, void par)
	Enables a continuous virtual timer.
static sysinterval_t	chVTGetReloadIntervalX (virtual_timer_t *vtp)
	Returns the current reload value.
static void	chVTSetReloadIntervalX (virtual_timer_t *vtp, sysinterval_t reload)
	Changes a timer reload time interval.
static systimestamp_t	chVTGetTimeStamp (void)
	Generates a monotonic time stamp.
static void	chVTResetTimeStamp (void)
	Resets and re-synchronizes the time stamps monotonic counter.
static void	__vt_object_init (virtual_timers_list_t *vtlp)
	Virtual Timers instance initialization.

Function Documentation

◆ vt_set_alarm()

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 69 of file chvt.c.

References CH_CFG_ST_TIMEDELTA, CH_RFCU_VT_INSUFFICIENT_DELTA, chDbgAssert, chRFCUCollectFaultsI(), chTimeAddX, chTimeDiffX, chVTGetSystemTimeX, and likely.

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

Here is the call graph for this function:

◆ vt_insert_first()

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 131 of file chvt.c.

References CH_CFG_ST_TIMEDELTA, ch_dlist_insert_after(), CH_RFCU_VT_INSUFFICIENT_DELTA, chDbgAssert, chRFCUCollectFaultsI(), chTimeAddX, chTimeDiffX, chVTGetSystemTimeX, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, and likely.

Referenced by chVTDoTickI(), and vt_enqueue().

Here is the call graph for this function:

◆ vt_enqueue()

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 205 of file chvt.c.

References ch_dlist_insert(), ch_dlist_isempty(), chTimeDiffX, chVTGetSystemTimeX, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, vt_insert_first(), and vt_set_alarm().

Referenced by chVTDoSetContinuousI(), and chVTDoSetI().

Here is the call graph for this function:

◆ 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	pointer to a `virtual_timer_t` structure
[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 277 of file chvt.c.

References chDbgCheck, chDbgCheckClassI, currcore, ch_virtual_timer::func, ch_virtual_timer::par, ch_virtual_timer::reload, TIME_IMMEDIATE, and vt_enqueue().

Referenced by chSchGoSleepTimeoutS(), and chVTSetI().

Here is the call graph for this function:

◆ chVTDoSetContinuousI()

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

Enables a continuous 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	pointer to a `virtual_timer_t` structure
[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 restarted.
[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 314 of file chvt.c.

References chDbgCheck, chDbgCheckClassI, currcore, ch_virtual_timer::func, ch_virtual_timer::par, ch_virtual_timer::reload, TIME_IMMEDIATE, and vt_enqueue().

Referenced by chVTSetContinuousI().

Here is the call graph for this function:

◆ 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 pointer to a virtual_timer_t structure

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 338 of file chvt.c.

References ch_dlist_dequeue(), ch_dlist_isempty(), ch_dlist_isfirst(), ch_dlist_remove_first(), chDbgAssert, chDbgCheck, chDbgCheckClassI, chTimeDiffX, chVTGetSystemTimeX, chVTIsArmedI(), currcore, ch_delta_list::delta, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, ch_delta_list::next, and vt_set_alarm().

Referenced by chSchGoSleepTimeoutS(), and chVTResetI().

Here is the call graph for this function:

◆ 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 pointer to a virtual_timer_t structure

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 424 of file chvt.c.

References chDbgAssert, chDbgCheckClassI, chTimeDiffX, chVTGetSystemTimeX, currcore, ch_delta_list::delta, ch_virtual_timer::dlist, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, and ch_delta_list::next.

◆ 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 464 of file chvt.c.

References ch_dlist_dequeue(), ch_dlist_insert(), ch_dlist_isempty(), ch_dlist_notempty(), CH_RFCU_VT_SKIPPED_DEADLINE, chDbgAssert, chDbgCheckClassI, chRFCUCollectFaultsI(), chSysLockFromISR, chSysUnlockFromISR, chTimeAddX, chTimeDiffX, chVTGetSystemTimeX, currcore, 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_timer::reload, ch_virtual_timers_list::systime, unlikely, vt_insert_first(), and vt_set_alarm().

Referenced by chSysTimerHandlerI().

Here is the call graph for this function:

◆ chVTGetTimeStampI()

systimestamp_t chVTGetTimeStampI ( void )

Generates a monotonic time stamp.

This function generates a monotonic time stamp synchronized with the system time. The time stamp has the same resolution of system time.

Note: There is an assumption, this function must be called at least once before the system time wraps back to zero or synchronization is lost. You may use a periodic virtual timer with a very large interval in order to keep time stamps synchronized by calling this function.

Returns: The time stamp.

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 626 of file chvt.c.

References chDbgAssert, chDbgCheckClassI, chTimeDiffX, chVTGetSystemTimeX, currcore, ch_virtual_timers_list::laststamp, and ch_os_instance::vtlist.

Referenced by chVTGetTimeStamp().

◆ chVTResetTimeStampI()

void chVTResetTimeStampI ( void )

Resets and re-synchronizes the time stamps monotonic counter.

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 657 of file chvt.c.

References chDbgCheckClassI, chVTGetSystemTimeX, and currcore.

Referenced by chVTResetTimeStamp().

◆ chVTObjectInit()

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:: Object or module nitializer function.

Definition at line 104 of file chvt.h.

References ch_virtual_timer::dlist, and ch_delta_list::next.

◆ chVTGetSystemTimeX()

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 122 of file chvt.h.

References currcore.

Referenced by __vt_object_init(), chVTGetSystemTime(), chVTIsSystemTimeWithinX(), and chVTTimeElapsedSinceX().

◆ chVTGetSystemTime()

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 141 of file chvt.h.

References chSysLock, chSysUnlock, and chVTGetSystemTimeX().

Referenced by chVTIsSystemTimeWithin().

Here is the call graph for this function:

◆ chVTTimeElapsedSinceX()

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 159 of file chvt.h.

References chTimeDiffX, and chVTGetSystemTimeX().

Here is the call graph for this function:

◆ chVTIsSystemTimeWithinX()

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 177 of file chvt.h.

References chTimeIsInRangeX(), and chVTGetSystemTimeX().

Here is the call graph for this function:

◆ chVTIsSystemTimeWithin()

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 195 of file chvt.h.

References chTimeIsInRangeX(), and chVTGetSystemTime().

Here is the call graph for this function:

◆ chVTGetTimersStateI()

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 216 of file chvt.h.

References CH_CFG_ST_TIMEDELTA, chDbgCheckClassI, chTimeDiffX, chVTGetSystemTimeX, currcore, ch_delta_list::delta, ch_virtual_timers_list::dlist, ch_virtual_timers_list::lasttime, and ch_delta_list::next.

◆ chVTIsArmedI()

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 248 of file chvt.h.

References chDbgCheckClassI, ch_virtual_timer::dlist, and ch_delta_list::next.

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

◆ chVTIsArmed()

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 265 of file chvt.h.

References chSysLock, chSysUnlock, and chVTIsArmedI().

Here is the call graph for this function:

◆ chVTResetI()

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 285 of file chvt.h.

References chVTDoResetI(), and chVTIsArmedI().

Referenced by chVTReset(), chVTSetContinuousI(), and chVTSetI().

Here is the call graph for this function:

◆ chVTReset()

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 302 of file chvt.h.

References chSysLock, chSysUnlock, and chVTResetI().

Here is the call graph for this function:

◆ chVTSetI()

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

inlinestatic

Enables a one-shot 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 331 of file chvt.h.

References chVTDoSetI(), and chVTResetI().

Referenced by chVTSet().

Here is the call graph for this function:

◆ chVTSet()

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

inlinestatic

Enables a one-shot 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 360 of file chvt.h.

References chSysLock, chSysUnlock, and chVTSetI().

Here is the call graph for this function:

◆ chVTSetContinuousI()

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

inlinestatic

Enables a continuous 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 390 of file chvt.h.

References chVTDoSetContinuousI(), and chVTResetI().

Referenced by chVTSetContinuous().

Here is the call graph for this function:

◆ chVTSetContinuous()

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

inlinestatic

Enables a continuous 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 419 of file chvt.h.

References chSysLock, chSysUnlock, and chVTSetContinuousI().

Here is the call graph for this function:

◆ chVTGetReloadIntervalX()

sysinterval_t chVTGetReloadIntervalX ( virtual_timer_t * vtp )

inlinestatic

Returns the current reload value.

Parameters

[in] vtp the virtual_timer_t structure pointer

Returns: The reload value.

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

Definition at line 435 of file chvt.h.

References ch_virtual_timer::reload.

◆ chVTSetReloadIntervalX()

void chVTSetReloadIntervalX	(	virtual_timer_t *	vtp,
		sysinterval_t	reload )

inlinestatic

Changes a timer reload time interval.

Note: This function is meant to be called from a timer callback, it does nothing in any other context.; Calling this function from a one-shot timer callback turns it into a continuous timer.

Parameters

[in]	vtp	the `virtual_timer_t` structure pointer
[in]	reload	the new reload value, zero means no reload

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

Definition at line 452 of file chvt.h.

References ch_virtual_timer::reload.

◆ chVTGetTimeStamp()

systimestamp_t chVTGetTimeStamp ( void )

inlinestatic

Generates a monotonic time stamp.

This function generates a monotonic time stamp synchronized with the system time. The time stamp has the same resolution of system time.

Note: There is an assumption, this function must be called at least once before the system time wraps back to zero or synchronization is lost. You may use a periodic virtual timer with a very large interval in order to keep time stamps synchronized by calling this function.

Returns: The time stamp.

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

Definition at line 474 of file chvt.h.

References chSysLock, chSysUnlock, and chVTGetTimeStampI().

Here is the call graph for this function:

◆ chVTResetTimeStamp()

void chVTResetTimeStamp ( void )

inlinestatic

Resets and re-synchronizes the time stamps monotonic counter.

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

Definition at line 491 of file chvt.h.

References chSysLock, chSysUnlock, and chVTResetTimeStampI().

Here is the call graph for this function:

◆ __vt_object_init()

void __vt_object_init ( virtual_timers_list_t * vtlp )

inlinestatic

Virtual Timers instance initialization.

Note: Internal use only.

Parameters

[out] vtlp pointer to the virtual_timers_list_t structure

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

Definition at line 509 of file chvt.h.

References ch_dlist_init(), chVTGetSystemTimeX(), ch_virtual_timers_list::dlist, ch_virtual_timers_list::laststamp, ch_virtual_timers_list::lasttime, and ch_virtual_timers_list::systime.

Referenced by chInstanceObjectInit().

Here is the call graph for this function:

Detailed Description

Functions

Function Documentation

◆ vt_set_alarm()

◆ vt_insert_first()

◆ vt_enqueue()

◆ chVTDoSetI()

◆ chVTDoSetContinuousI()

◆ chVTDoResetI()

◆ chVTGetRemainingIntervalI()

◆ chVTDoTickI()

◆ chVTGetTimeStampI()

◆ chVTResetTimeStampI()

◆ chVTObjectInit()

◆ chVTGetSystemTimeX()

◆ chVTGetSystemTime()

◆ chVTTimeElapsedSinceX()

◆ chVTIsSystemTimeWithinX()

◆ chVTIsSystemTimeWithin()

◆ chVTGetTimersStateI()

◆ chVTIsArmedI()

◆ chVTIsArmed()

◆ chVTResetI()

◆ chVTReset()

◆ chVTSetI()

◆ chVTSet()

◆ chVTSetContinuousI()

◆ chVTSetContinuous()

◆ chVTGetReloadIntervalX()

◆ chVTSetReloadIntervalX()

◆ chVTGetTimeStamp()

◆ chVTResetTimeStamp()

◆ __vt_object_init()