* Wait for sighandler (and thus mb()) to execute on every thread.
* BUSY-LOOP.
*/
- while (sig_done < 1)
- smp_rmb(); /* ensure we re-read sig-done */
+ while (LOAD_REMOTE(sig_done) < 1)
+ cpu_relax();
smp_mb(); /* read sig_done before ending the barrier */
}
if (!reader_data)
return;
sig_done = 0;
- smp_mb(); /* write sig_done before sending the signals */
+ /*
+ * pthread_kill has a smp_mb(). But beware, we assume it performs
+ * a cache flush on architectures with non-coherent cache.
+ * smp_mb(); write sig_done before sending the signals
+ */
for (index = reader_data; index < reader_data + num_readers; index++)
pthread_kill(index->tid, SIGURCU);
/*
* Wait for sighandler (and thus mb()) to execute on every thread.
* BUSY-LOOP.
*/
- while (sig_done < num_readers)
- smp_rmb(); /* ensure we re-read sig-done */
+ while (LOAD_REMOTE(sig_done) < num_readers)
+ cpu_relax();
smp_mb(); /* read sig_done before ending the barrier */
}
#endif
* waiting forever while new readers are always accessing data (no
* progress).
*/
- smp_mb();
+ smp_mc();
/*
* Wait for previous parity to be empty of readers.
* the writer waiting forever while new readers are always accessing
* data (no progress).
*/
- smp_mb();
+ smp_mc();
switch_next_urcu_qparity(); /* 1 -> 0 */
* waiting forever while new readers are always accessing data (no
* progress).
*/
- smp_mb();
+ smp_mc();
/*
* Wait for previous parity to be empty of readers.