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kernel: add k_is_preempt_thread()

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Useful for finding out if the current thread is protected against
preemption when using non-preemption to protect data structures.

Change-Id: Ib545a3609af3646ba49eeeb5a2c50dc51af010d4
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2016-11-10 15:54:27 -05:00 • committed by Anas Nashif
commit 445830dcec
2 changed files with 19 additions and 0 deletions
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14
include/kernel.h
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@ -420,6 +420,20 @@ extern void k_sched_time_slice_set(int32_t slice, int prio);
*/ */
extern int k_is_in_isr(void); extern int k_is_in_isr(void);
/**
* @brief Determine if code is running in a preemptible thread.
*
* Returns a 'true' value if these conditions are all met:
*
* - the code is not running in an ISR
* - the thread's priority is in the preemptible range
* - the thread has not locked the scheduler
*
* @return 0 if invoked by either an ISR or a cooperative thread.
* @return Non-zero if invoked by a preemptible thread.
*/
extern int k_is_preempt_thread(void);
/* /*
* @brief Lock the scheduler * @brief Lock the scheduler
* *

5
kernel/unified/sched.c
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@ -363,3 +363,8 @@ void k_sched_time_slice_set(int32_t duration_in_ms, int prio)
_time_slice_prio_ceiling = prio; _time_slice_prio_ceiling = prio;
} }
#endif /* CONFIG_TIMESLICING */ #endif /* CONFIG_TIMESLICING */
int k_is_preempt_thread(void)
{
return !_is_in_isr() && _is_preempt(_current);
}