kal_timer Struct Reference

Implementation of kal_timer based on hrtimer.h. More...

#include <kal_timer_hrtimer.h>

Data Fields
struct hrtimer	hrtimer
kal_timer_cb	timer_cb
kal_arg_t	timer_cb_data
char	handler_running

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Detailed Description

Implementation of kal_timer based on hrtimer.h.

This type may be logically thought of as a subclass of hrtimer, so that (dynamic) casting from kal_timer * to/from hrtimer * is safe.

Note:

The field handler_running is useful whenever trying to cancel a timer from within its own handler (hrtimer_cancel() hangs the kernel on such a case, contrary to timer_del()). Such variable is set and unset within hrtimer_cb(), without any application-specific spinlock held. However, the only situation in which it is useful is when the application-supplied timer handler tries to delete the same timer, and it works for such a case. On the other hand, when cancelling a timer from non-interrupt context, the timer handler runs atomically w.r.t. the kernel code, thus the latter cannot find handler_running at 1 and erroneously skip the cancel of the timer.

Definition at line 43 of file kal_timer_hrtimer.h.

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Field Documentation

char kal_timer::handler_running

Definition at line 47 of file kal_timer_hrtimer.h.

struct hrtimer kal_timer::hrtimer

Definition at line 44 of file kal_timer_hrtimer.h.

kal_timer_cb kal_timer::timer_cb

Definition at line 45 of file kal_timer_hrtimer.h.

kal_arg_t kal_timer::timer_cb_data

Definition at line 46 of file kal_timer_hrtimer.h.

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The documentation for this struct was generated from the following file:

• kal_timer_hrtimer.h