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xtimer: implement xtimer_msg_receive_timeout

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This commit is contained in:
Oleg Hahm 2015-11-14 20:33:01 +01:00
parent 567d0efe16
commit 0ddd6ec15e
1 changed files with 31 additions and 9 deletions
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40
sys/xtimer/xtimer.c
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@ -159,22 +159,44 @@ void xtimer_now_timex(timex_t *out)
out->microseconds = now - (out->seconds * SEC_IN_USEC);
}
int xtimer_msg_receive_timeout64(msg_t *m, uint64_t timeout) {
msg_t tmsg;
tmsg.type = MSG_XTIMER;
tmsg.content.ptr = (char *) &tmsg;
/* Prepares the message to trigger the timeout.
* Additionally, the xtimer_t struct gets initialized.
*/
static void _setup_timer_msg(msg_t *m, xtimer_t *t)
{
m->type = MSG_XTIMER;
m->content.ptr = (char *) m;
xtimer_t t;
t.target = t.long_target = 0;
xtimer_set_msg64(&t, timeout, &tmsg, sched_active_pid);
t->target = t->long_target = 0;
}
/* Waits for incoming message or timeout. */
static int _msg_wait(msg_t *m, msg_t *tmsg, xtimer_t *t)
{
msg_receive(m);
if (m->type == MSG_XTIMER && m->content.ptr == (char *) &tmsg) {
if (m->type == MSG_XTIMER && m->content.ptr == (char *) tmsg) {
/* we hit the timeout */
return -1;
}
else {
xtimer_remove(&t);
xtimer_remove(t);
return 1;
}
}
int xtimer_msg_receive_timeout64(msg_t *m, uint64_t timeout) {
msg_t tmsg;
xtimer_t t;
_setup_timer_msg(&tmsg, &t);
xtimer_set_msg64(&t, timeout, &tmsg, sched_active_pid);
return _msg_wait(m, &tmsg, &t);
}
int xtimer_msg_receive_timeout(msg_t *msg, uint32_t us)
{
msg_t tmsg;
xtimer_t t;
_setup_timer_msg(&tmsg, &t);
xtimer_set_msg(&t, us, &tmsg, sched_active_pid);
return _msg_wait(msg, &tmsg, &t);
}