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core: sched: correctly unschedule when there's no idle thread

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This commit is contained in:
Kaspar Schleiser 2020-06-17 10:57:49 +02:00
parent baca419934
commit d199865a12
1 changed files with 36 additions and 23 deletions
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59
core/sched.c
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@ -76,18 +76,45 @@ static void (*sched_cb) (kernel_pid_t active_thread,
kernel_pid_t next_thread) = NULL;
#endif
static void _unschedule(thread_t *active_thread)
{
if (active_thread->status == STATUS_RUNNING) {
active_thread->status = STATUS_PENDING;
}
#ifdef SCHED_TEST_STACK
if (*((uintptr_t *)active_thread->stack_start) !=
(uintptr_t)active_thread->stack_start) {
LOG_WARNING(
"scheduler(): stack overflow detected, pid=%" PRIkernel_pid "\n",
active_thread->pid);
}
#endif
#ifdef MODULE_SCHED_CB
if (sched_cb) {
sched_cb(active_thread->pid, KERNEL_PID_UNDEF);
}
#endif
}
int __attribute__((used)) sched_run(void)
{
sched_context_switch_request = 0;
#ifndef MODULE_CORE_IDLE_THREAD
while (!runqueue_bitcache) {
sched_arch_idle();
}
#endif
thread_t *active_thread = (thread_t *)sched_active_thread;
if (!IS_USED(MODULE_CORE_IDLE_THREAD)) {
if (!runqueue_bitcache) {
if (active_thread) {
_unschedule(active_thread);
active_thread = NULL;
}
while (!runqueue_bitcache) {
sched_arch_idle();
}
}
}
int nextrq = bitarithm_lsb(runqueue_bitcache);
thread_t *next_thread = container_of(sched_runqueues[nextrq].next->next,
thread_t, rq_entry);
@ -105,26 +132,12 @@ int __attribute__((used)) sched_run(void)
}
if (active_thread) {
if (active_thread->status == STATUS_RUNNING) {
active_thread->status = STATUS_PENDING;
}
#ifdef SCHED_TEST_STACK
if (*((uintptr_t *)active_thread->stack_start) !=
(uintptr_t)active_thread->stack_start) {
LOG_WARNING(
"scheduler(): stack overflow detected, pid=%" PRIkernel_pid "\n",
active_thread->pid);
}
#endif
_unschedule(active_thread);
}
#ifdef MODULE_SCHED_CB
if (sched_cb) {
/* Use `sched_active_pid` instead of `active_thread` since after `sched_task_exit()` is
called `active_thread` is set to NULL while `sched_active_thread` isn't updated until
`next_thread` is scheduled*/
sched_cb(sched_active_pid, next_thread->pid);
sched_cb(KERNEL_PID_UNDEF, next_thread->pid);
}
#endif