rculfhash: output approximation of number of nodes in counting

[urcu.git] / rculfhash.c

diff --git a/rculfhash.c b/rculfhash.c
index 6045f5965c4d55207a84145031a1763a447d748c..93c2d7850fad9da9c333b47f738af08758ed62ed 100644 (file)
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -1446,13 +1446,25 @@ int cds_lfht_destroy(struct cds_lfht *ht, pthread_attr_t **attr)
 }
 
 void cds_lfht_count_nodes(struct cds_lfht *ht,
+               unsigned long *approx_before,
                unsigned long *count,
-               unsigned long *removed)
+               unsigned long *removed,
+               unsigned long *approx_after)
 {
        struct cds_lfht_node *node, *next;
        struct _cds_lfht_node *lookup;
        unsigned long nr_dummy = 0;
 
+       *approx_before = uatomic_read(&ht->count);
+       if (nr_cpus_mask >= 0) {
+               int i;
+
+               for (i = 0; i < nr_cpus_mask + 1; i++) {
+                       *approx_before += uatomic_read(&ht->percpu_count[i].add);
+                       *approx_before -= uatomic_read(&ht->percpu_count[i].del);
+               }
+       }
+
        *count = 0;
        *removed = 0;
 
@@ -1462,8 +1474,10 @@ void cds_lfht_count_nodes(struct cds_lfht *ht,
        do {
                next = rcu_dereference(node->p.next);
                if (is_removed(next)) {
-                       assert(!is_dummy(next));
-                       (*removed)++;
+                       if (!is_dummy(next))
+                               (*removed)++;
+                       else
+                               (nr_dummy)++;
                } else if (!is_dummy(next))
                        (*count)++;
                else
@@ -1471,6 +1485,15 @@ void cds_lfht_count_nodes(struct cds_lfht *ht,
                node = clear_flag(next);
        } while (!is_end(node));
        dbg_printf("number of dummy nodes: %lu\n", nr_dummy);
+       *approx_after = uatomic_read(&ht->count);
+       if (nr_cpus_mask >= 0) {
+               int i;
+
+               for (i = 0; i < nr_cpus_mask + 1; i++) {
+                       *approx_after += uatomic_read(&ht->percpu_count[i].add);
+                       *approx_after -= uatomic_read(&ht->percpu_count[i].del);
+               }
+       }
 }
 
 /* called with resize mutex held */