patrick/zephyr
1
0
Fork 0
Code Issues Pull requests Actions 8 Packages Projects Releases Wiki Activity

unified: Simplify k_msgq_purge()

Browse source 
Simplifies k_msgq_purge() at the expense of making the case of an
already empty message queue a little slower.

Change-Id: I8fafd6d49233efbf23b95d171f81bf795e828454
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
This commit is contained in:
Peter Mitsis 2016-09-22 13:59:00 -04:00 committed by Benjamin Walsh
parent 223b962e0b
commit 340d00ab51
1 changed files with 10 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
kernel/unified/msg_q.c
View file

@ -186,31 +186,17 @@ int k_msgq_get(struct k_msgq *q, void *data, int32_t timeout)
void k_msgq_purge(struct k_msgq *q)
{
unsigned int key = irq_lock();
struct tcs *pending_thread;
if (q->used_msgs) {
/* wake up any threads that are waiting to write */
while (1) {
struct tcs *pending_thread =
_unpend_first_thread(&q->wait_q);
if (pending_thread == NULL) {
break;
}
_set_thread_return_value(pending_thread, -ENOMSG);
_timeout_abort(pending_thread);
_ready_thread(pending_thread);
}
q->used_msgs = 0;
q->read_ptr = q->write_ptr;
if (_must_switch_threads()) {
_Swap(key);
return;
}
} else {
/* queue is empty, so no need to do anything ... */
/* wake up any threads that are waiting to write */
while ((pending_thread = _unpend_first_thread(&q->wait_q)) != NULL) {
_set_thread_return_value(pending_thread, -ENOMSG);
_timeout_abort(pending_thread);
_ready_thread(pending_thread);
}
irq_unlock(key);
q->used_msgs = 0;
q->read_ptr = q->write_ptr;
_reschedule_threads(key);
}