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sys/schedstatistics: handle if PIDs are KERNEL_PID_UNDEF

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Previously, sched_statistics_cb() was always called with two valid PIDs.
Now it is possible (when the idle thread is not used) that one of the
two might be KERNEL_PID_UNDEF, as the callback might be called when
descheduling the last thread, or scheduling the first.
This commit is contained in:
Kaspar Schleiser 2020-06-16 13:18:53 +02:00
parent 0ff9e554eb
commit baca419934
1 changed files with 10 additions and 7 deletions
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17
sys/schedstatistics/schedstatistics.c
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@ -31,15 +31,18 @@ void sched_statistics_cb(kernel_pid_t active_thread, kernel_pid_t next_thread)
{
uint32_t now = xtimer_now().ticks32;
/* Update active thread runtime, there is always an active thread since
first sched_run happens when main_trampoline gets scheduled */
schedstat_t *active_stat = &sched_pidlist[active_thread];
active_stat->runtime_ticks += now - active_stat->laststart;
/* Update active thread stats */
if (active_thread != KERNEL_PID_UNDEF) {
schedstat_t *active_stat = &sched_pidlist[active_thread];
active_stat->runtime_ticks += now - active_stat->laststart;
}
/* Update next_thread stats */
schedstat_t *next_stat = &sched_pidlist[next_thread];
next_stat->laststart = now;
next_stat->schedules++;
if (next_thread != KERNEL_PID_UNDEF) {
schedstat_t *next_stat = &sched_pidlist[next_thread];
next_stat->laststart = now;
next_stat->schedules++;
}
}
void init_schedstatistics(void)