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kernel: add flag that tells the system is handling timeouts

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This limits the execution contexts that will go over the loop in
_unpend_first_thread() to only ISRs of very high priority that are
preempting the system clock timer ISR, and only during the time it is
handling timeouts.

Change-Id: Iaf0500d28a2de5e077c9cf9861a5a70244127d58
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2016-12-19 13:55:17 -05:00 • committed by Anas Nashif
commit eec37e6752
2 changed files with 11 additions and 2 deletions
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6
kernel/include/ksched.h
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@ -418,11 +418,13 @@ static inline struct k_thread *_peek_first_pending_thread(_wait_q_t *wait_q)
static inline struct k_thread *_get_thread_to_unpend(_wait_q_t *wait_q)
{
#ifdef CONFIG_SYS_CLOCK_EXISTS
if (_is_in_isr()) {
/* skip threads that have an expired timeout */
extern volatile int _handling_timeouts;
if (_handling_timeouts) {
sys_dlist_t *q = (sys_dlist_t *)wait_q;
sys_dnode_t *cur, *next;
/* skip threads that have an expired timeout */
SYS_DLIST_FOR_EACH_NODE_SAFE(q, cur, next) {
struct k_thread *thread = (struct k_thread *)cur;