rculfhash: output approximation of number of nodes in counting

[urcu.git] / tests / test_urcu_hash.c

diff --git a/tests/test_urcu_hash.c b/tests/test_urcu_hash.c
index b68db492cc0a794e0503059de006109e41e4da02..1e1cf47423942dbac3279c12e777dfc3270a7d52 100644 (file)
--- a/tests/test_urcu_hash.c
+++ b/tests/test_urcu_hash.c
@@ -194,6 +194,26 @@ void sigusr1_handler(int signo)
        }
 }
 
+static
+void sigusr2_handler(int signo)
+{
+       unsigned long count, removed, approx_before, approx_after;
+
+       /* Accounting */
+       printf("Counting nodes... ");
+       fflush(stdout);
+       cds_lfht_count_nodes(test_ht, &approx_before, &count, &removed,
+                       &approx_after);
+       printf("done.\n");
+       printf("Approximation before node accounting: %lu nodes.\n",
+               approx_before);
+       printf("Accounting of nodes in the hash table: "
+               "%lu nodes + %lu logically removed.\n",
+               count, removed);
+       printf("Approximation after node accounting: %lu nodes.\n",
+               approx_after);
+}
+
 /*
  * returns 0 if test should end.
  */
@@ -623,7 +643,7 @@ int main(int argc, char **argv)
        struct wr_count *count_writer;
        unsigned long long tot_reads = 0, tot_writes = 0,
                tot_add = 0, tot_add_exist = 0, tot_remove = 0;
-       unsigned long count, removed;
+       unsigned long count, removed, approx_before, approx_after;
        int i, a, ret;
        struct sigaction act;
        unsigned int remain;
@@ -765,6 +785,13 @@ int main(int argc, char **argv)
                perror("sigaction");
                return -1;
        }
+       act.sa_handler = sigusr2_handler;
+       act.sa_flags = SA_RESTART;
+       ret = sigaction(SIGUSR2, &act, NULL);
+       if (ret == -1) {
+               perror("sigaction");
+               return -1;
+       }
 
        printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
                duration, nr_readers, nr_writers);
@@ -846,11 +873,18 @@ int main(int argc, char **argv)
        }
        printf("Counting nodes... ");
        fflush(stdout);
-       cds_lfht_count_nodes(test_ht, &count, &removed);
+       cds_lfht_count_nodes(test_ht, &approx_before, &count, &removed,
+               &approx_after);
        printf("done.\n");
-       if (count || removed)
+       if (count || removed) {
+               printf("Approximation before node accounting: %lu nodes.\n",
+                       approx_before);
                printf("WARNING: nodes left in the hash table upon destroy: "
-                       "%lu nodes + %lu logically removed.\n", count, removed);
+                       "%lu nodes + %lu logically removed.\n",
+                       count, removed);
+               printf("Approximation after node accounting: %lu nodes.\n",
+                       approx_after);
+       }
        ret = cds_lfht_destroy(test_ht, NULL);
 
        if (ret)