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EVE 1.0
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Files | |
| file | etimer.c |
| file | etimer.h |
Data Structures | |
| struct | etimer |
Functions called from application programs | |
| void | etimer_set (struct etimer *et, clock_time_t interval) |
| Set an event timer. More... | |
| void | etimer_reset (struct etimer *et) |
| Reset an event timer with the same interval as was previously set. More... | |
| void | etimer_restart (struct etimer *et) |
| Restart an event timer from the current point in time. More... | |
| void | etimer_adjust (struct etimer *et, int td) |
| Adjust the expiration time for an event timer. More... | |
| int | etimer_expired (struct etimer *et) |
| Check if an event timer has expired. More... | |
| clock_time_t | etimer_expiration_time (struct etimer *et) |
| Get the expiration time for the event timer. More... | |
| clock_time_t | etimer_start_time (struct etimer *et) |
| Get the start time for the event timer. More... | |
| void | etimer_stop (struct etimer *et) |
| Stop a pending event timer. More... | |
Functions called from timer interrupts, by the system | |
| void | etimer_request_poll (void) |
| Make the event timer aware that the clock has changed. More... | |
| int | etimer_pending (void) |
| Check if there are any non-expired event timers. More... | |
| clock_time_t | etimer_next_expiration_time (void) |
| Get next event timer expiration time. More... | |
Event timers provides a way to generate timed events. An event timer will post an event to the process that set the timer when the event timer expires.
An event timer is declared as a struct etimer and all access to the event timer is made by a pointer to the declared event timer.
| void etimer_request_poll | ( | void | ) |
Make the event timer aware that the clock has changed.
This function is used to inform the event timer module that the system clock has been updated. Typically, this function would be called from the timer interrupt handler when the clock has ticked.
Definition at line 173 of file etimer.c.
References PROCESS_CURRENT, and process_poll().
| CCIF void etimer_set | ( | struct etimer * | et, |
| clock_time_t | interval | ||
| ) |
Set an event timer.
| et | A pointer to the event timer |
| interval | The interval before the timer expires. This function is used to set an event timer for a time
sometime in the future. When the event timer expires,
the event PROCESS_EVENT_TIMER will be posted to the
process that called the etimer_set() function. |
Definition at line 205 of file etimer.c.
References timer_set().
Referenced by ctimer_set(), and tcpip_input().
| CCIF void etimer_reset | ( | struct etimer * | et | ) |
Reset an event timer with the same interval as was previously set.
| et | A pointer to the event timer. This function resets the event timer with the same
interval that was given to the event timer with the
etimer_set() function. The start point of the interval
is the exact time that the event timer last
expired. Therefore, this function will cause the timer
to be stable over time, unlike the etimer_restart()
function.
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Definition at line 212 of file etimer.c.
References timer_reset().
Referenced by ctimer_reset().
| void etimer_restart | ( | struct etimer * | et | ) |
Restart an event timer from the current point in time.
| et | A pointer to the event timer. This function restarts the event timer with the same
interval that was given to the etimer_set()
function. The event timer will start at the current
time.
\note A periodic timer will drift if this function is
used to reset it. For periodic timers, use the
etimer_reset() function instead.
|
Definition at line 219 of file etimer.c.
References timer_restart().
Referenced by ctimer_restart(), and tcpip_output().
| void etimer_adjust | ( | struct etimer * | et, |
| int | td | ||
| ) |
Adjust the expiration time for an event timer.
| et | A pointer to the event timer. |
| td | The time difference to adjust the expiration time with. This function is used to adjust the time the event
timer will expire. It can be used to synchronize
periodic timers without the need to restart the timer
or change the timer interval.
\note This function should only be used for small
adjustments. For large adjustments use etimer_set()
instead.
\note A periodic timer will drift unless the
etimer_reset() function is used.
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| CCIF int etimer_expired | ( | struct etimer * | et | ) |
Check if an event timer has expired.
| et | A pointer to the event timer |
This function tests if an event timer has expired and
returns true or false depending on its status. Definition at line 233 of file etimer.c.
Referenced by ctimer_expired(), and tcpip_output().
| clock_time_t etimer_expiration_time | ( | struct etimer * | et | ) |
| clock_time_t etimer_start_time | ( | struct etimer * | et | ) |
| int etimer_pending | ( | void | ) |
Check if there are any non-expired event timers.
This function checks if there are any active event timers that have not expired.
Definition at line 251 of file etimer.c.
Referenced by etimer_next_expiration_time().
| clock_time_t etimer_next_expiration_time | ( | void | ) |
Get next event timer expiration time.
This functions returns next expiration time of all pending event timers.
Definition at line 257 of file etimer.c.
References etimer_pending().
Referenced by clock_delay_usec().
| void etimer_stop | ( | struct etimer * | et | ) |
Stop a pending event timer.
| et | A pointer to the pending event timer. This function stops an event timer that has previously
been set with etimer_set() or etimer_reset(). After
this function has been called, the event timer will not
emit any event when it expires. |
Definition at line 263 of file etimer.c.
Referenced by ctimer_stop().
1.8.11