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Merge pull request #1407 from LudwigOrtmann/issue-571

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sys/vtimer: spin on short duration in vtimer_sleep
This commit is contained in:
Oleg Hahm 2014-07-16 22:14:27 +02:00
commit 04493cc026
1 changed files with 14 additions and 1 deletions
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15
sys/vtimer/vtimer.c
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@ -1,7 +1,7 @@
/**
* virtual timer
*
* Copyright (C) 2013 Freie Universität Berlin
* Copyright (C) 2013, 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License. See the file LICENSE in the top level directory for more
@ -323,6 +323,19 @@ int vtimer_usleep(uint32_t usecs)
int vtimer_sleep(timex_t time)
{
/**
* Use spin lock for short periods.
* Assumes that hardware timer ticks are shorter than a second.
* Decision based on hwtimer_wait implementation.
*/
if (time.seconds == 0) {
unsigned long ticks = HWTIMER_TICKS(time.microseconds);
if (ticks <= 6) {
hwtimer_spin(ticks);
return 0;
}
}
int ret;
vtimer_t t;
mutex_t mutex;