Print reader duration

[urcu.git] / test_rwlock.c

diff --git a/test_rwlock.c b/test_rwlock.c
index 0fdaad60b9871641d30b7e1eca3007f3ff07ad06..ec2ca6e6a95c170026c5fd05e9eaf693947b83f2 100644 (file)
--- a/test_rwlock.c
+++ b/test_rwlock.c
@@ -71,6 +71,15 @@ static volatile struct test_array test_array = { 8 };
 
 static unsigned long duration;
 
+/* read-side C.S. duration, in loops */
+static unsigned long rduration;
+
+static inline void loop_sleep(unsigned long l)
+{
+       while(l-- != 0)
+               cpu_relax();
+}
+
 /*
  * returns 0 if test should end.
  */
@@ -127,6 +136,8 @@ void *thr_reader(void *_count)
        for (;;) {
                pthread_rwlock_rdlock(&lock);
                assert(test_array.a == 8);
+               if (unlikely(rduration))
+                       loop_sleep(rduration);
                pthread_rwlock_unlock(&lock);
                nr_reads++;
                if (unlikely(!test_duration_read()))
@@ -177,6 +188,7 @@ void show_usage(int argc, char **argv)
        printf(" [-r] [-w] (yield reader and/or writer)");
 #endif
        printf(" [-d delay] (writer period (us))");
+       printf(" [-c duration] (reader C.S. duration (in loops))");
        printf(" [-a cpu#] [-a cpu#]... (affinity)");
        printf("\n");
 }
@@ -241,6 +253,13 @@ int main(int argc, char **argv)
                        use_affinity = 1;
                        printf("Adding CPU %d affinity\n", a);
                        break;
+               case 'c':
+                       if (argc < i + 2) {
+                               show_usage(argc, argv);
+                               return -1;
+                       }
+                       rduration = atoi(argv[++i]);
+                       break;
                case 'd':
                        if (argc < i + 2) {
                                show_usage(argc, argv);
@@ -254,6 +273,7 @@ int main(int argc, char **argv)
        printf("running test for %lu seconds, %u readers, %u writers.\n",
                duration, nr_readers, nr_writers);
        printf("Writer delay : %u us.\n", wdelay);
+       printf("Reader duration : %lu loops.\n", rduration);
        printf("thread %-6s, thread id : %lx, tid %lu\n",
                        "main", pthread_self(), (unsigned long)gettid());
        if (use_affinity