On 02/01/2012 03:49 PM, Daniel Lezcano wrote:
IMO, you have a race condition with nrunning. What guarantee do you
have atomic_dec_and_test is called after atomic_inc ?
Nothing (but I believe ~1s is pretty enough for the kernel thread to get
woken up). I also tried to to atomic_inc() at the beginning of test(), like:
...
static int test(void *unused)
{
int i;
ktime_t expires = ktime_set(0, NSEC_PER_MSEC);
atomic_inc(&nrunning);
for (i = 0; !kthread_should_stop() && i < loopcount; i++)
schedule_hrtimeout_range(&expires, 50000, HRTIMER_MODE_REL);
if (atomic_dec_and_test(&nrunning))
complete(&done);
return 0;
}
...
Results are the same.
Dmitry
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