Add a debug option to dump statistics counters every ten seconds

[bluesky.git] / bluesky / debug.c

diff --git a/bluesky/debug.c b/bluesky/debug.c
index 7de5095..bea8322 100644 (file)
--- a/bluesky/debug.c
+++ b/bluesky/debug.c
@@ -166,3 +166,48 @@ void bluesky_stats_dump_all()
     }
     g_static_mutex_unlock(&stats_lock);
 }
+
+static void periodic_stats_dumper(FILE *f)
+{
+    const int64_t interval = 10 * 1000000000ULL;
+    bluesky_time_hires timestamp = bluesky_now_hires();
+    bluesky_time_hires next_timestamp = timestamp;
+
+    while (TRUE) {
+        g_static_mutex_lock(&stats_lock);
+        timestamp = bluesky_now_hires();
+        fprintf(f, "********\ntime=%f\n\n", timestamp / 1e9);
+        for (GList *item = stats_list; item != NULL; item = item->next) {
+            struct bluesky_stats *stats = (struct bluesky_stats *)item->data;
+            fprintf(f, "%s: count=%"PRIi64" sum=%"PRIi64"\n",
+                    stats->name, stats->count, stats->sum);
+        }
+        g_static_mutex_unlock(&stats_lock);
+        fflush(f);
+
+        /* Wait until ten seconds from the last timestamp, with a few extra
+         * checks for sanity (always try to wait some amount of time in the
+         * range [0, 20] seconds). */
+        timestamp = bluesky_now_hires();
+        next_timestamp += interval;
+        if (next_timestamp < timestamp) {
+            next_timestamp = timestamp;
+            continue;
+        }
+        if (next_timestamp - timestamp > 2 * interval) {
+            next_timestamp = timestamp + interval;
+        }
+
+        struct timespec delay;
+        delay.tv_sec = (next_timestamp - timestamp) / 1000000000;
+        delay.tv_nsec = (next_timestamp - timestamp) % 1000000000;
+        nanosleep(&delay, NULL);
+    }
+}
+
+/* Start a background thread that will periodically dump statistics counters to
+ * he specified file every ten seconds. */
+void bluesky_stats_run_periodic_dump(FILE *f)
+{
+    g_thread_create((GThreadFunc)periodic_stats_dumper, f, FALSE, NULL);
+}