X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Frrdtool.c;h=b366a9c64166eeeae135f700b069e81578cac28a;hb=83077c18c3e78739c2d2d18debf99875944eaa72;hp=1e9e52a93cbd8e52b774f48c42c2902bb01b3b03;hpb=d91c8449c887c87cd776d06eb07b78cca73707b1;p=collectd.git

diff --git a/src/rrdtool.c b/src/rrdtool.c
index 1e9e52a9..b366a9c6 100644
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -109,7 +109,7 @@ static rrdcreate_config_t rrdcreate_config =
  * ALWAYS lock `cache_lock' first! */
 static cdtime_t    cache_timeout = 0;
 static cdtime_t    cache_flush_timeout = 0;
-static cdtime_t    random_timeout = 1;
+static cdtime_t    random_timeout = TIME_T_TO_CDTIME_T (1);
 static cdtime_t    cache_flush_last;
 static c_avl_tree_t *cache = NULL;
 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
@@ -305,7 +305,7 @@ static void *rrd_queue_thread (void __attribute__((unused)) *data)
 
                 pthread_mutex_lock (&queue_lock);
                 /* Wait for values to arrive */
-                while (true)
+                while (42)
                 {
                   struct timespec ts_wait;
 
@@ -344,7 +344,7 @@ static void *rrd_queue_thread (void __attribute__((unused)) *data)
                       &ts_wait);
                   if (status == ETIMEDOUT)
                     break;
-                } /* while (true) */
+                } /* while (42) */
 
                 /* XXX: If you need to lock both, cache_lock and queue_lock, at
                  * the same time, ALWAYS lock `cache_lock' first! */
@@ -661,6 +661,14 @@ static int64_t rrd_get_random_variation (void)
   if (random_timeout <= 0)
     return (0);
 
+  /* Assure that "cache_timeout + random_variation" is never negative. */
+  if (random_timeout > cache_timeout)
+  {
+	  INFO ("rrdtool plugin: Adjusting \"RandomTimeout\" to %.3f seconds.",
+			  CDTIME_T_TO_DOUBLE (cache_timeout));
+	  random_timeout = cache_timeout;
+  }
+
   /* This seems a bit complicated, but "random_timeout" is likely larger than
    * RAND_MAX, so we can't simply use modulo here. */
   dbl_timeout = CDTIME_T_TO_DOUBLE (random_timeout);
@@ -674,9 +682,6 @@ static int64_t rrd_get_random_variation (void)
   if (negative)
     ret *= -1;
 
-  DEBUG ("rrdtool plugin: random_variation = %.3f s",
-      (negative ? -1.0 : 1.0) * dbl_timeout * rand_fact);
-
   return (ret);
 } /* int64_t rrd_get_random_variation */
 
@@ -709,7 +714,7 @@ static int rrd_cache_insert (const char *filename,
 		rc->values = NULL;
 		rc->first_value = 0;
 		rc->last_value = 0;
-		rc->random_variation = 0;
+		rc->random_variation = rrd_get_random_variation ();
 		rc->flags = FLAG_NONE;
 		new_rc = 1;
 	}
@@ -780,7 +785,7 @@ static int rrd_cache_insert (const char *filename,
 			filename, rc->values_num,
 			CDTIME_T_TO_DOUBLE (rc->last_value - rc->first_value));
 
-	if ((rc->last_value + rc->random_variation - rc->first_value) >= cache_timeout)
+	if ((rc->last_value - rc->first_value) >= (cache_timeout + rc->random_variation))
 	{
 		/* XXX: If you need to lock both, cache_lock and queue_lock, at
 		 * the same time, ALWAYS lock `cache_lock' first! */
@@ -1101,7 +1106,7 @@ static int rrd_config (const char *key, const char *value)
 		}
 		else
 		{
-			cache_timeout = DOUBLE_TO_CDTIME_T (tmp);
+			random_timeout = DOUBLE_TO_CDTIME_T (tmp);
 		}
 	}
 	else
@@ -1162,12 +1167,12 @@ static int rrd_init (void)
 		rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
 
 	if ((rrdcreate_config.heartbeat > 0)
-			&& (rrdcreate_config.heartbeat < interval_g))
+			&& (rrdcreate_config.heartbeat < CDTIME_T_TO_TIME_T (interval_g)))
 		WARNING ("rrdtool plugin: Your `heartbeat' is "
 				"smaller than your `interval'. This will "
 				"likely cause problems.");
 	else if ((rrdcreate_config.stepsize > 0)
-			&& (rrdcreate_config.stepsize < interval_g))
+			&& (rrdcreate_config.stepsize < CDTIME_T_TO_TIME_T (interval_g)))
 		WARNING ("rrdtool plugin: Your `stepsize' is "
 				"smaller than your `interval'. This will "
 				"create needlessly big RRD-files.");