2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006-2013 Florian octo Forster
4 * Copyright (C) 2008-2008 Sebastian Harl
5 * Copyright (C) 2009 Mariusz Gronczewski
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 * Florian octo Forster <octo at collectd.org>
22 * Sebastian Harl <sh at tokkee.org>
23 * Mariusz Gronczewski <xani666 at gmail.com>
29 #include "utils_avltree.h"
30 #include "utils_rrdcreate.h"
47 int64_t random_variation;
55 typedef struct rrd_cache_s rrd_cache_t;
62 typedef enum rrd_queue_dir_e rrd_queue_dir_t;
67 struct rrd_queue_s *next;
69 typedef struct rrd_queue_s rrd_queue_t;
74 static const char *config_keys[] =
87 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
89 /* If datadir is zero, the daemon's basedir is used. If stepsize or heartbeat
90 * is zero a default, depending on the `interval' member of the value list is
92 static char *datadir = NULL;
93 static double write_rate = 0.0;
94 static rrdcreate_config_t rrdcreate_config =
101 /* timespans = */ NULL,
102 /* timespans_num = */ 0,
104 /* consolidation_functions = */ NULL,
105 /* consolidation_functions_num = */ 0
108 /* XXX: If you need to lock both, cache_lock and queue_lock, at the same time,
109 * ALWAYS lock `cache_lock' first! */
110 static cdtime_t cache_timeout = 0;
111 static cdtime_t cache_flush_timeout = 0;
112 static cdtime_t random_timeout = TIME_T_TO_CDTIME_T (1);
113 static cdtime_t cache_flush_last;
114 static c_avl_tree_t *cache = NULL;
115 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
117 static rrd_queue_t *queue_head = NULL;
118 static rrd_queue_t *queue_tail = NULL;
119 static rrd_queue_t *flushq_head = NULL;
120 static rrd_queue_t *flushq_tail = NULL;
121 static pthread_t queue_thread;
122 static int queue_thread_running = 1;
123 static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
124 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
126 #if !HAVE_THREADSAFE_LIBRRD
127 static pthread_mutex_t librrd_lock = PTHREAD_MUTEX_INITIALIZER;
130 static int do_shutdown = 0;
132 #if HAVE_THREADSAFE_LIBRRD
133 static int srrd_update (char *filename, char *template,
134 int argc, const char **argv)
138 optind = 0; /* bug in librrd? */
141 status = rrd_update_r (filename, template, argc, (void *) argv);
145 WARNING ("rrdtool plugin: rrd_update_r (%s) failed: %s",
146 filename, rrd_get_error ());
150 } /* int srrd_update */
151 /* #endif HAVE_THREADSAFE_LIBRRD */
153 #else /* !HAVE_THREADSAFE_LIBRRD */
154 static int srrd_update (char *filename, char *template,
155 int argc, const char **argv)
162 assert (template == NULL);
165 new_argv = (char **) malloc ((new_argc + 1) * sizeof (char *));
166 if (new_argv == NULL)
168 ERROR ("rrdtool plugin: malloc failed.");
172 new_argv[0] = "update";
173 new_argv[1] = filename;
175 memcpy (new_argv + 2, argv, argc * sizeof (char *));
176 new_argv[new_argc] = NULL;
178 pthread_mutex_lock (&librrd_lock);
179 optind = 0; /* bug in librrd? */
182 status = rrd_update (new_argc, new_argv);
183 pthread_mutex_unlock (&librrd_lock);
187 WARNING ("rrdtool plugin: rrd_update_r failed: %s: %s",
188 filename, rrd_get_error ());
194 } /* int srrd_update */
195 #endif /* !HAVE_THREADSAFE_LIBRRD */
197 static int value_list_to_string (char *buffer, int buffer_len,
198 const data_set_t *ds, const value_list_t *vl)
205 memset (buffer, '\0', buffer_len);
207 tt = CDTIME_T_TO_TIME_T (vl->time);
208 status = ssnprintf (buffer, buffer_len, "%u", (unsigned int) tt);
209 if ((status < 1) || (status >= buffer_len))
213 for (i = 0; i < ds->ds_num; i++)
215 if ((ds->ds[i].type != DS_TYPE_COUNTER)
216 && (ds->ds[i].type != DS_TYPE_GAUGE)
217 && (ds->ds[i].type != DS_TYPE_DERIVE)
218 && (ds->ds[i].type != DS_TYPE_ABSOLUTE))
221 if (ds->ds[i].type == DS_TYPE_COUNTER)
222 status = ssnprintf (buffer + offset, buffer_len - offset,
223 ":%llu", vl->values[i].counter);
224 else if (ds->ds[i].type == DS_TYPE_GAUGE)
225 status = ssnprintf (buffer + offset, buffer_len - offset,
226 ":%lf", vl->values[i].gauge);
227 else if (ds->ds[i].type == DS_TYPE_DERIVE)
228 status = ssnprintf (buffer + offset, buffer_len - offset,
229 ":%"PRIi64, vl->values[i].derive);
230 else /*if (ds->ds[i].type == DS_TYPE_ABSOLUTE) */
231 status = ssnprintf (buffer + offset, buffer_len - offset,
232 ":%"PRIu64, vl->values[i].absolute);
234 if ((status < 1) || (status >= (buffer_len - offset)))
238 } /* for ds->ds_num */
241 } /* int value_list_to_string */
243 static int value_list_to_filename (char *buffer, size_t buffer_size,
244 value_list_t const *vl)
246 char const suffix[] = ".rrd";
252 size_t datadir_len = strlen (datadir) + 1;
254 if (datadir_len >= buffer_size)
257 sstrncpy (buffer, datadir, buffer_size);
258 buffer[datadir_len - 1] = '/';
259 buffer[datadir_len] = 0;
261 buffer += datadir_len;
262 buffer_size -= datadir_len;
265 status = FORMAT_VL (buffer, buffer_size, vl);
269 len = strlen (buffer);
270 assert (len < buffer_size);
274 if (buffer_size <= sizeof (suffix))
277 memcpy (buffer, suffix, sizeof (suffix));
279 } /* int value_list_to_filename */
281 static void *rrd_queue_thread (void __attribute__((unused)) *data)
283 struct timeval tv_next_update;
284 struct timeval tv_now;
286 gettimeofday (&tv_next_update, /* timezone = */ NULL);
290 rrd_queue_t *queue_entry;
291 rrd_cache_t *cache_entry;
300 pthread_mutex_lock (&queue_lock);
301 /* Wait for values to arrive */
304 struct timespec ts_wait;
306 while ((flushq_head == NULL) && (queue_head == NULL)
307 && (do_shutdown == 0))
308 pthread_cond_wait (&queue_cond, &queue_lock);
310 if ((flushq_head == NULL) && (queue_head == NULL))
313 /* Don't delay if there's something to flush */
314 if (flushq_head != NULL)
317 /* Don't delay if we're shutting down */
318 if (do_shutdown != 0)
321 /* Don't delay if no delay was configured. */
322 if (write_rate <= 0.0)
325 gettimeofday (&tv_now, /* timezone = */ NULL);
326 status = timeval_cmp (tv_next_update, tv_now, NULL);
327 /* We're good to go */
331 /* We're supposed to wait a bit with this update, so we'll
332 * wait for the next addition to the queue or to the end of
333 * the wait period - whichever comes first. */
334 ts_wait.tv_sec = tv_next_update.tv_sec;
335 ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
337 status = pthread_cond_timedwait (&queue_cond, &queue_lock,
339 if (status == ETIMEDOUT)
343 /* XXX: If you need to lock both, cache_lock and queue_lock, at
344 * the same time, ALWAYS lock `cache_lock' first! */
346 /* We're in the shutdown phase */
347 if ((flushq_head == NULL) && (queue_head == NULL))
349 pthread_mutex_unlock (&queue_lock);
353 if (flushq_head != NULL)
355 /* Dequeue the first flush entry */
356 queue_entry = flushq_head;
357 if (flushq_head == flushq_tail)
358 flushq_head = flushq_tail = NULL;
360 flushq_head = flushq_head->next;
362 else /* if (queue_head != NULL) */
364 /* Dequeue the first regular entry */
365 queue_entry = queue_head;
366 if (queue_head == queue_tail)
367 queue_head = queue_tail = NULL;
369 queue_head = queue_head->next;
372 /* Unlock the queue again */
373 pthread_mutex_unlock (&queue_lock);
375 /* We now need the cache lock so the entry isn't updated while
376 * we make a copy of it's values */
377 pthread_mutex_lock (&cache_lock);
379 status = c_avl_get (cache, queue_entry->filename,
380 (void *) &cache_entry);
384 values = cache_entry->values;
385 values_num = cache_entry->values_num;
387 cache_entry->values = NULL;
388 cache_entry->values_num = 0;
389 cache_entry->flags = FLAG_NONE;
392 pthread_mutex_unlock (&cache_lock);
396 sfree (queue_entry->filename);
401 /* Update `tv_next_update' */
402 if (write_rate > 0.0)
404 gettimeofday (&tv_now, /* timezone = */ NULL);
405 tv_next_update.tv_sec = tv_now.tv_sec;
406 tv_next_update.tv_usec = tv_now.tv_usec
407 + ((suseconds_t) (1000000 * write_rate));
408 while (tv_next_update.tv_usec > 1000000)
410 tv_next_update.tv_sec++;
411 tv_next_update.tv_usec -= 1000000;
415 /* Write the values to the RRD-file */
416 srrd_update (queue_entry->filename, NULL,
417 values_num, (const char **)values);
418 DEBUG ("rrdtool plugin: queue thread: Wrote %i value%s to %s",
419 values_num, (values_num == 1) ? "" : "s",
420 queue_entry->filename);
422 for (i = 0; i < values_num; i++)
427 sfree (queue_entry->filename);
431 pthread_exit ((void *) 0);
433 } /* void *rrd_queue_thread */
435 static int rrd_queue_enqueue (const char *filename,
436 rrd_queue_t **head, rrd_queue_t **tail)
438 rrd_queue_t *queue_entry;
440 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
441 if (queue_entry == NULL)
444 queue_entry->filename = strdup (filename);
445 if (queue_entry->filename == NULL)
451 queue_entry->next = NULL;
453 pthread_mutex_lock (&queue_lock);
458 (*tail)->next = queue_entry;
461 pthread_cond_signal (&queue_cond);
462 pthread_mutex_unlock (&queue_lock);
465 } /* int rrd_queue_enqueue */
467 static int rrd_queue_dequeue (const char *filename,
468 rrd_queue_t **head, rrd_queue_t **tail)
473 pthread_mutex_lock (&queue_lock);
480 if (strcmp (this->filename, filename) == 0)
489 pthread_mutex_unlock (&queue_lock);
496 prev->next = this->next;
498 if (this->next == NULL)
501 pthread_mutex_unlock (&queue_lock);
503 sfree (this->filename);
507 } /* int rrd_queue_dequeue */
509 /* XXX: You must hold "cache_lock" when calling this function! */
510 static void rrd_cache_flush (cdtime_t timeout)
519 c_avl_iterator_t *iter;
522 DEBUG ("rrdtool plugin: Flushing cache, timeout = %.3f",
523 CDTIME_T_TO_DOUBLE (timeout));
526 timeout = TIME_T_TO_CDTIME_T (timeout);
528 /* Build a list of entries to be flushed */
529 iter = c_avl_get_iterator (cache);
530 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
532 if (rc->flags != FLAG_NONE)
534 /* timeout == 0 => flush everything */
535 else if ((timeout != 0)
536 && ((now - rc->first_value) < timeout))
538 else if (rc->values_num > 0)
542 status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
544 rc->flags = FLAG_QUEUED;
546 else /* ancient and no values -> waste of memory */
548 char **tmp = (char **) realloc ((void *) keys,
549 (keys_num + 1) * sizeof (char *));
553 ERROR ("rrdtool plugin: "
554 "realloc failed: %s",
555 sstrerror (errno, errbuf,
557 c_avl_iterator_destroy (iter);
562 keys[keys_num] = key;
565 } /* while (c_avl_iterator_next) */
566 c_avl_iterator_destroy (iter);
568 for (i = 0; i < keys_num; i++)
570 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
572 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
576 assert (rc->values == NULL);
577 assert (rc->values_num == 0);
582 } /* for (i = 0..keys_num) */
586 cache_flush_last = now;
587 } /* void rrd_cache_flush */
589 static int rrd_cache_flush_identifier (cdtime_t timeout,
590 const char *identifier)
597 if (identifier == NULL)
599 rrd_cache_flush (timeout);
606 snprintf (key, sizeof (key), "%s.rrd",
609 snprintf (key, sizeof (key), "%s/%s.rrd",
610 datadir, identifier);
611 key[sizeof (key) - 1] = 0;
613 status = c_avl_get (cache, key, (void *) &rc);
616 INFO ("rrdtool plugin: rrd_cache_flush_identifier: "
617 "c_avl_get (%s) failed. Does that file really exist?",
622 if (rc->flags == FLAG_FLUSHQ)
626 else if (rc->flags == FLAG_QUEUED)
628 rrd_queue_dequeue (key, &queue_head, &queue_tail);
629 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
631 rc->flags = FLAG_FLUSHQ;
633 else if ((now - rc->first_value) < timeout)
637 else if (rc->values_num > 0)
639 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
641 rc->flags = FLAG_FLUSHQ;
645 } /* int rrd_cache_flush_identifier */
647 static int64_t rrd_get_random_variation (void)
650 cdtime_t ctm_timeout;
655 if (random_timeout <= 0)
658 /* Assure that "cache_timeout + random_variation" is never negative. */
659 if (random_timeout > cache_timeout)
661 INFO ("rrdtool plugin: Adjusting \"RandomTimeout\" to %.3f seconds.",
662 CDTIME_T_TO_DOUBLE (cache_timeout));
663 random_timeout = cache_timeout;
666 /* This seems a bit complicated, but "random_timeout" is likely larger than
667 * RAND_MAX, so we can't simply use modulo here. */
668 dbl_timeout = CDTIME_T_TO_DOUBLE (random_timeout);
669 rand_fact = ((double) random ())
670 / ((double) RAND_MAX);
671 negative = (_Bool) (random () % 2);
673 ctm_timeout = DOUBLE_TO_CDTIME_T (dbl_timeout * rand_fact);
675 ret = (int64_t) ctm_timeout;
680 } /* int64_t rrd_get_random_variation */
682 static int rrd_cache_insert (const char *filename,
683 const char *value, cdtime_t value_time)
685 rrd_cache_t *rc = NULL;
689 pthread_mutex_lock (&cache_lock);
691 /* This shouldn't happen, but it did happen at least once, so we'll be
695 pthread_mutex_unlock (&cache_lock);
696 WARNING ("rrdtool plugin: cache == NULL.");
700 c_avl_get (cache, filename, (void *) &rc);
704 rc = malloc (sizeof (*rc));
711 rc->random_variation = rrd_get_random_variation ();
712 rc->flags = FLAG_NONE;
716 if (rc->last_value >= value_time)
718 pthread_mutex_unlock (&cache_lock);
719 DEBUG ("rrdtool plugin: (rc->last_value = %"PRIu64") "
720 ">= (value_time = %"PRIu64")",
721 rc->last_value, value_time);
725 values_new = (char **) realloc ((void *) rc->values,
726 (rc->values_num + 1) * sizeof (char *));
727 if (values_new == NULL)
730 void *cache_key = NULL;
732 sstrerror (errno, errbuf, sizeof (errbuf));
734 c_avl_remove (cache, filename, &cache_key, NULL);
735 pthread_mutex_unlock (&cache_lock);
737 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
744 rc->values = values_new;
746 rc->values[rc->values_num] = strdup (value);
747 if (rc->values[rc->values_num] != NULL)
750 if (rc->values_num == 1)
751 rc->first_value = value_time;
752 rc->last_value = value_time;
754 /* Insert if this is the first value */
757 void *cache_key = strdup (filename);
759 if (cache_key == NULL)
762 sstrerror (errno, errbuf, sizeof (errbuf));
764 pthread_mutex_unlock (&cache_lock);
766 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
768 sfree (rc->values[0]);
774 c_avl_insert (cache, cache_key, rc);
777 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
778 "values_num = %i; age = %.3f;",
779 filename, rc->values_num,
780 CDTIME_T_TO_DOUBLE (rc->last_value - rc->first_value));
782 if ((rc->last_value - rc->first_value) >= (cache_timeout + rc->random_variation))
784 /* XXX: If you need to lock both, cache_lock and queue_lock, at
785 * the same time, ALWAYS lock `cache_lock' first! */
786 if (rc->flags == FLAG_NONE)
790 status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
792 rc->flags = FLAG_QUEUED;
794 rc->random_variation = rrd_get_random_variation ();
798 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
802 if ((cache_timeout > 0) &&
803 ((cdtime () - cache_flush_last) > cache_flush_timeout))
804 rrd_cache_flush (cache_flush_timeout);
806 pthread_mutex_unlock (&cache_lock);
809 } /* int rrd_cache_insert */
811 static int rrd_cache_destroy (void) /* {{{ */
818 pthread_mutex_lock (&cache_lock);
822 pthread_mutex_unlock (&cache_lock);
826 while (c_avl_pick (cache, &key, &value) == 0)
837 if (rc->values_num > 0)
840 for (i = 0; i < rc->values_num; i++)
841 sfree (rc->values[i]);
846 c_avl_destroy (cache);
851 INFO ("rrdtool plugin: %i cache %s had values when destroying the cache.",
852 non_empty, (non_empty == 1) ? "entry" : "entries");
856 DEBUG ("rrdtool plugin: No values have been lost "
857 "when destroying the cache.");
860 pthread_mutex_unlock (&cache_lock);
862 } /* }}} int rrd_cache_destroy */
864 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
866 int a = *((int *) a_ptr);
867 int b = *((int *) b_ptr);
875 } /* int rrd_compare_numeric */
877 static int rrd_write (const data_set_t *ds, const value_list_t *vl,
878 user_data_t __attribute__((unused)) *user_data)
888 if (0 != strcmp (ds->type, vl->type)) {
889 ERROR ("rrdtool plugin: DS type does not match value list type");
893 if (value_list_to_filename (filename, sizeof (filename), vl) != 0)
896 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
899 if (stat (filename, &statbuf) == -1)
903 status = cu_rrd_create_file (filename,
904 ds, vl, &rrdcreate_config);
911 ERROR ("stat(%s) failed: %s", filename,
912 sstrerror (errno, errbuf,
917 else if (!S_ISREG (statbuf.st_mode))
919 ERROR ("stat(%s): Not a regular file!",
924 status = rrd_cache_insert (filename, values, vl->time);
927 } /* int rrd_write */
929 static int rrd_flush (cdtime_t timeout, const char *identifier,
930 __attribute__((unused)) user_data_t *user_data)
932 pthread_mutex_lock (&cache_lock);
935 pthread_mutex_unlock (&cache_lock);
939 rrd_cache_flush_identifier (timeout, identifier);
941 pthread_mutex_unlock (&cache_lock);
943 } /* int rrd_flush */
945 static int rrd_config (const char *key, const char *value)
947 if (strcasecmp ("CacheTimeout", key) == 0)
949 double tmp = atof (value);
952 fprintf (stderr, "rrdtool: `CacheTimeout' must "
953 "be greater than 0.\n");
954 ERROR ("rrdtool: `CacheTimeout' must "
955 "be greater than 0.\n");
958 cache_timeout = DOUBLE_TO_CDTIME_T (tmp);
960 else if (strcasecmp ("CacheFlush", key) == 0)
962 int tmp = atoi (value);
965 fprintf (stderr, "rrdtool: `CacheFlush' must "
966 "be greater than 0.\n");
967 ERROR ("rrdtool: `CacheFlush' must "
968 "be greater than 0.\n");
971 cache_flush_timeout = tmp;
973 else if (strcasecmp ("DataDir", key) == 0)
977 datadir = strdup (value);
980 int len = strlen (datadir);
981 while ((len > 0) && (datadir[len - 1] == '/'))
993 else if (strcasecmp ("StepSize", key) == 0)
995 unsigned long temp = strtoul (value, NULL, 0);
997 rrdcreate_config.stepsize = temp;
999 else if (strcasecmp ("HeartBeat", key) == 0)
1001 int temp = atoi (value);
1003 rrdcreate_config.heartbeat = temp;
1005 else if (strcasecmp ("RRARows", key) == 0)
1007 int tmp = atoi (value);
1010 fprintf (stderr, "rrdtool: `RRARows' must "
1011 "be greater than 0.\n");
1012 ERROR ("rrdtool: `RRARows' must "
1013 "be greater than 0.\n");
1016 rrdcreate_config.rrarows = tmp;
1018 else if (strcasecmp ("RRATimespan", key) == 0)
1020 char *saveptr = NULL;
1026 value_copy = strdup (value);
1027 if (value_copy == NULL)
1031 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
1035 tmp_alloc = realloc (rrdcreate_config.timespans,
1036 sizeof (int) * (rrdcreate_config.timespans_num + 1));
1037 if (tmp_alloc == NULL)
1039 fprintf (stderr, "rrdtool: realloc failed.\n");
1040 ERROR ("rrdtool: realloc failed.\n");
1044 rrdcreate_config.timespans = tmp_alloc;
1045 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
1046 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
1047 rrdcreate_config.timespans_num++;
1048 } /* while (strtok_r) */
1050 qsort (/* base = */ rrdcreate_config.timespans,
1051 /* nmemb = */ rrdcreate_config.timespans_num,
1052 /* size = */ sizeof (rrdcreate_config.timespans[0]),
1053 /* compar = */ rrd_compare_numeric);
1057 else if (strcasecmp ("XFF", key) == 0)
1059 double tmp = atof (value);
1060 if ((tmp < 0.0) || (tmp >= 1.0))
1062 fprintf (stderr, "rrdtool: `XFF' must "
1063 "be in the range 0 to 1 (exclusive).");
1064 ERROR ("rrdtool: `XFF' must "
1065 "be in the range 0 to 1 (exclusive).");
1068 rrdcreate_config.xff = tmp;
1070 else if (strcasecmp ("WritesPerSecond", key) == 0)
1072 double wps = atof (value);
1076 fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
1077 "greater than or equal to zero.");
1080 else if (wps == 0.0)
1086 write_rate = 1.0 / wps;
1089 else if (strcasecmp ("RandomTimeout", key) == 0)
1096 fprintf (stderr, "rrdtool: `RandomTimeout' must "
1097 "be greater than or equal to zero.\n");
1098 ERROR ("rrdtool: `RandomTimeout' must "
1099 "be greater then or equal to zero.");
1103 random_timeout = DOUBLE_TO_CDTIME_T (tmp);
1111 } /* int rrd_config */
1113 static int rrd_shutdown (void)
1115 pthread_mutex_lock (&cache_lock);
1116 rrd_cache_flush (0);
1117 pthread_mutex_unlock (&cache_lock);
1119 pthread_mutex_lock (&queue_lock);
1121 pthread_cond_signal (&queue_cond);
1122 pthread_mutex_unlock (&queue_lock);
1124 if ((queue_thread_running != 0)
1125 && ((queue_head != NULL) || (flushq_head != NULL)))
1127 INFO ("rrdtool plugin: Shutting down the queue thread. "
1128 "This may take a while.");
1130 else if (queue_thread_running != 0)
1132 INFO ("rrdtool plugin: Shutting down the queue thread.");
1135 /* Wait for all the values to be written to disk before returning. */
1136 if (queue_thread_running != 0)
1138 pthread_join (queue_thread, NULL);
1139 memset (&queue_thread, 0, sizeof (queue_thread));
1140 queue_thread_running = 0;
1141 DEBUG ("rrdtool plugin: queue_thread exited.");
1144 rrd_cache_destroy ();
1147 } /* int rrd_shutdown */
1149 static int rrd_init (void)
1151 static int init_once = 0;
1158 if (rrdcreate_config.heartbeat <= 0)
1159 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
1161 /* Set the cache up */
1162 pthread_mutex_lock (&cache_lock);
1164 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1167 ERROR ("rrdtool plugin: c_avl_create failed.");
1171 cache_flush_last = cdtime ();
1172 if (cache_timeout == 0)
1174 cache_flush_timeout = 0;
1176 else if (cache_flush_timeout < cache_timeout)
1177 cache_flush_timeout = 10 * cache_timeout;
1179 pthread_mutex_unlock (&cache_lock);
1181 status = plugin_thread_create (&queue_thread, /* attr = */ NULL,
1182 rrd_queue_thread, /* args = */ NULL);
1185 ERROR ("rrdtool plugin: Cannot create queue-thread.");
1188 queue_thread_running = 1;
1190 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %lu;"
1191 " heartbeat = %i; rrarows = %i; xff = %lf;",
1192 (datadir == NULL) ? "(null)" : datadir,
1193 rrdcreate_config.stepsize,
1194 rrdcreate_config.heartbeat,
1195 rrdcreate_config.rrarows,
1196 rrdcreate_config.xff);
1199 } /* int rrd_init */
1201 void module_register (void)
1203 plugin_register_config ("rrdtool", rrd_config,
1204 config_keys, config_keys_num);
1205 plugin_register_init ("rrdtool", rrd_init);
1206 plugin_register_write ("rrdtool", rrd_write, /* user_data = */ NULL);
1207 plugin_register_flush ("rrdtool", rrd_flush, /* user_data = */ NULL);
1208 plugin_register_shutdown ("rrdtool", rrd_shutdown);