#include <poll.h>
#include <urcu/config.h>
+#include <urcu/annotate.h>
#include <urcu/assert.h>
#include <urcu/arch.h>
#include <urcu/wfcqueue.h>
*/
static void wait_for_readers(struct cds_list_head *input_readers,
struct cds_list_head *cur_snap_readers,
- struct cds_list_head *qsreaders)
+ struct cds_list_head *qsreaders,
+ cmm_annotate_t *group)
{
unsigned int wait_loops = 0;
struct urcu_reader *index, *tmp;
}
cds_list_for_each_entry_safe(index, tmp, input_readers, node) {
- switch (urcu_common_reader_state(&rcu_gp, &index->ctr)) {
+ switch (urcu_common_reader_state(&rcu_gp, &index->ctr, group)) {
case URCU_READER_ACTIVE_CURRENT:
if (cur_snap_readers) {
cds_list_move(&index->node,
void synchronize_rcu(void)
{
+ cmm_annotate_define(acquire_group);
+ cmm_annotate_define(release_group);
CDS_LIST_HEAD(cur_snap_readers);
CDS_LIST_HEAD(qsreaders);
DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
* queue before their insertion into the wait queue.
*/
if (urcu_wait_add(&gp_waiters, &wait) != 0) {
- /* Not first in queue: will be awakened by another thread. */
+ /*
+ * Not first in queue: will be awakened by another thread.
+ * Implies a memory barrier after grace period.
+ */
urcu_adaptative_busy_wait(&wait);
- /* Order following memory accesses after grace period. */
- cmm_smp_mb();
return;
}
/* We won't need to wake ourself up */
*/
/* Write new ptr before changing the qparity */
smp_mb_master();
+ cmm_annotate_group_mb_release(&release_group);
/*
* Wait for readers to observe original parity or be quiescent.
* wait_for_readers() can release and grab again rcu_registry_lock
* internally.
*/
- wait_for_readers(®istry, &cur_snap_readers, &qsreaders);
+ wait_for_readers(®istry, &cur_snap_readers, &qsreaders, &acquire_group);
/*
* Must finish waiting for quiescent state for original parity before
cmm_smp_mb();
/* Switch parity: 0 -> 1, 1 -> 0 */
- CMM_STORE_SHARED(rcu_gp.ctr, rcu_gp.ctr ^ URCU_GP_CTR_PHASE);
+ cmm_annotate_group_mem_release(&release_group, &rcu_gp.ctr);
+ uatomic_store(&rcu_gp.ctr, rcu_gp.ctr ^ URCU_GP_CTR_PHASE, CMM_RELAXED);
/*
* Must commit rcu_gp.ctr update to memory before waiting for quiescent
* wait_for_readers() can release and grab again rcu_registry_lock
* internally.
*/
- wait_for_readers(&cur_snap_readers, NULL, &qsreaders);
+ wait_for_readers(&cur_snap_readers, NULL, &qsreaders, &acquire_group);
/*
* Put quiescent reader list back into registry.
* iterates on reader threads.
*/
smp_mb_master();
+ cmm_annotate_group_mb_acquire(&acquire_group);
out:
mutex_unlock(&rcu_registry_lock);
mutex_unlock(&rcu_gp_lock);