I've just been going to fio code to see if I can add a wrapper to
variables being protected by read_barrier() and write_barrier() and I
came across this:
mutex.c:
242 void fio_mutex_up(struct fio_mutex *mutex)
243 {
244 int do_wake = 0;
245
246 assert(mutex->magic == FIO_MUTEX_MAGIC);
247
248 pthread_mutex_lock(&mutex->lock);
249 read_barrier();
250 if (!mutex->value && mutex->waiters)
251 do_wake = 1;
252 mutex->value++;
What is this read_barrier() protecting? From what I can the only time
we manipulate mutex->value and mutex->waiters without being under
mutex->lock is __fio_mutex_init()...
--
Sitsofe | http://sucs.org/~sits/
--
To unsubscribe from this list: send the line "unsubscribe fio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
