include/poller.php

   1 <?php
   2 if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
   3         $directory = dirname($_SERVER["argv"][0]);
   4
   5         if (substr($directory, 0, 1) != "/")
   6                 $directory = $_SERVER["PWD"]."/".$directory;
   7
   8         $directory = realpath($directory."/..");
   9
  10         chdir($directory);
  11 }
  12
  13 use \Friendica\Core\Config;
  14
  15 require_once("boot.php");
  16
  17 function poller_run($argv, $argc){
  18         global $a, $db;
  19
  20         if(is_null($a)) {
  21                 $a = new App;
  22         }
  23
  24         if(is_null($db)) {
  25                 @include(".htconfig.php");
  26                 require_once("include/dba.php");
  27                 $db = new dba($db_host, $db_user, $db_pass, $db_data);
  28                 unset($db_host, $db_user, $db_pass, $db_data);
  29         };
  30
  31         Config::load();
  32
  33         // Quit when in maintenance
  34         if (Config::get('system', 'maintenance', true)) {
  35                 return;
  36         }
  37
  38         $a->set_baseurl(Config::get('system', 'url'));
  39
  40         load_hooks();
  41
  42         $a->start_process();
  43
  44         if ($a->min_memory_reached()) {
  45                 return;
  46         }
  47
  48         if (poller_max_connections_reached()) {
  49                 return;
  50         }
  51
  52         if ($a->maxload_reached()) {
  53                 return;
  54         }
  55
  56         if(($argc <= 1) OR ($argv[1] != "no_cron")) {
  57                 poller_run_cron();
  58         }
  59
  60         if ($a->max_processes_reached()) {
  61                 return;
  62         }
  63
  64         // Checking the number of workers
  65         if (poller_too_much_workers()) {
  66                 poller_kill_stale_workers();
  67                 return;
  68         }
  69
  70         $starttime = time();
  71
  72         while ($r = poller_worker_process()) {
  73
  74                 // Count active workers and compare them with a maximum value that depends on the load
  75                 if (poller_too_much_workers()) {
  76                         return;
  77                 }
  78
  79                 if (!poller_execute($r[0])) {
  80                         return;
  81                 }
  82
  83                 // Quit the poller once every hour
  84                 if (time() > ($starttime + 3600))
  85                         return;
  86         }
  87
  88 }
  89
  90 /**
  91  * @brief Execute a worker entry
  92  *
  93  * @param array $queue Workerqueue entry
  94  *
  95  * @return boolean "true" if further processing should be stopped
  96  */
  97 function poller_execute($queue) {
  98
  99         $a = get_app();
 100
 101         $mypid = getmypid();
 102
 103         // Quit when in maintenance
 104         if (Config::get('system', 'maintenance', true)) {
 105                 return false;
 106         }
 107
 108         // Constantly check the number of parallel database processes
 109         if ($a->max_processes_reached()) {
 110                 return false;
 111         }
 112
 113         // Constantly check the number of available database connections to let the frontend be accessible at any time
 114         if (poller_max_connections_reached()) {
 115                 return false;
 116         }
 117
 118         $upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
 119                 dbesc(datetime_convert()),
 120                 intval($mypid),
 121                 intval($queue["id"]));
 122
 123         if (!$upd) {
 124                 logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
 125                 q("COMMIT");
 126                 return true;
 127         }
 128
 129         // Assure that there are no tasks executed twice
 130         $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 131         if (!$id) {
 132                 logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
 133                 q("COMMIT");
 134                 return true;
 135         } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
 136                 logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
 137                 q("COMMIT");
 138                 return true;
 139         } elseif ($id[0]["pid"] != $mypid) {
 140                 logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
 141                 q("COMMIT");
 142                 return true;
 143         }
 144         q("COMMIT");
 145
 146         $argv = json_decode($queue["parameter"]);
 147
 148         // Check for existance and validity of the include file
 149         $include = $argv[0];
 150
 151         if (!validate_include($include)) {
 152                 logger("Include file ".$argv[0]." is not valid!");
 153                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 154                 return true;
 155         }
 156
 157         require_once($include);
 158
 159         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 160
 161         if (function_exists($funcname)) {
 162
 163                 poller_exec_function($queue, $funcname, $argv);
 164
 165                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 166         } else {
 167                 logger("Function ".$funcname." does not exist");
 168         }
 169
 170         return true;
 171 }
 172
 173 /**
 174  * @brief Execute a function from the queue
 175  *
 176  * @param array $queue Workerqueue entry
 177  * @param string $funcname name of the function
 178  * @param array $argv Array of values to be passed to the function
 179  */
 180 function poller_exec_function($queue, $funcname, $argv) {
 181
 182         $a = get_app();
 183
 184         $mypid = getmypid();
 185
 186         $argc = count($argv);
 187
 188         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 189
 190         $stamp = (float)microtime(true);
 191
 192         // We use the callstack here to analyze the performance of executed worker entries.
 193         // For this reason the variables have to be initialized.
 194         if (Config::get("system", "profiler")) {
 195                 $a->performance["start"] = microtime(true);
 196                 $a->performance["database"] = 0;
 197                 $a->performance["database_write"] = 0;
 198                 $a->performance["network"] = 0;
 199                 $a->performance["file"] = 0;
 200                 $a->performance["rendering"] = 0;
 201                 $a->performance["parser"] = 0;
 202                 $a->performance["marktime"] = 0;
 203                 $a->performance["markstart"] = microtime(true);
 204                 $a->callstack = array();
 205         }
 206
 207         // For better logging create a new process id for every worker call
 208         // But preserve the old one for the worker
 209         $old_process_id = $a->process_id;
 210         $a->process_id = uniqid("wrk", true);
 211
 212         $funcname($argv, $argc);
 213
 214         $a->process_id = $old_process_id;
 215
 216         $duration = number_format(microtime(true) - $stamp, 3);
 217
 218         if ($duration > 3600) {
 219                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 220         } elseif ($duration > 600) {
 221                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 222         } elseif ($duration > 300) {
 223                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 224         } elseif ($duration > 120) {
 225                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 226         }
 227
 228         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 229
 230         // Write down the performance values into the log
 231         if (Config::get("system", "profiler")) {
 232                 $duration = microtime(true)-$a->performance["start"];
 233
 234                 if (Config::get("rendertime", "callstack")) {
 235                         if (isset($a->callstack["database"])) {
 236                                 $o = "\nDatabase Read:\n";
 237                                 foreach ($a->callstack["database"] AS $func => $time) {
 238                                         $time = round($time, 3);
 239                                         if ($time > 0)
 240                                                 $o .= $func.": ".$time."\n";
 241                                 }
 242                         }
 243                         if (isset($a->callstack["database_write"])) {
 244                                 $o .= "\nDatabase Write:\n";
 245                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 246                                         $time = round($time, 3);
 247                                         if ($time > 0)
 248                                                 $o .= $func.": ".$time."\n";
 249                                 }
 250                         }
 251                         if (isset($a->callstack["network"])) {
 252                                 $o .= "\nNetwork:\n";
 253                                 foreach ($a->callstack["network"] AS $func => $time) {
 254                                         $time = round($time, 3);
 255                                         if ($time > 0)
 256                                                 $o .= $func.": ".$time."\n";
 257                                 }
 258                         }
 259                 } else {
 260                         $o = '';
 261                 }
 262
 263                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 264                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 265                         number_format($a->performance["database_write"], 2),
 266                         number_format($a->performance["network"], 2),
 267                         number_format($a->performance["file"], 2),
 268                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 269                         number_format($duration, 2)),
 270                         LOGGER_DEBUG);
 271         }
 272
 273         $cooldown = Config::get("system", "worker_cooldown", 0);
 274
 275         if ($cooldown > 0) {
 276                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 277                 sleep($cooldown);
 278         }
 279 }
 280
 281 /**
 282  * @brief Checks if the number of database connections has reached a critical limit.
 283  *
 284  * @return bool Are more than 3/4 of the maximum connections used?
 285  */
 286 function poller_max_connections_reached() {
 287
 288         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 289         $max = Config::get("system", "max_connections");
 290
 291         // Fetch the percentage level where the poller will get active
 292         $maxlevel = Config::get("system", "max_connections_level", 75);
 293
 294         if ($max == 0) {
 295                 // the maximum number of possible user connections can be a system variable
 296                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 297                 if ($r)
 298                         $max = $r[0]["Value"];
 299
 300                 // Or it can be granted. This overrides the system variable
 301                 $r = q("SHOW GRANTS");
 302                 if ($r)
 303                         foreach ($r AS $grants) {
 304                                 $grant = array_pop($grants);
 305                                 if (stristr($grant, "GRANT USAGE ON"))
 306                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
 307                                                 $max = $match[1];
 308                         }
 309         }
 310
 311         // If $max is set we will use the processlist to determine the current number of connections
 312         // The processlist only shows entries of the current user
 313         if ($max != 0) {
 314                 $r = q("SHOW PROCESSLIST");
 315                 if (!dbm::is_result($r))
 316                         return false;
 317
 318                 $used = count($r);
 319
 320                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 321
 322                 $level = ($used / $max) * 100;
 323
 324                 if ($level >= $maxlevel) {
 325                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 326                         return true;
 327                 }
 328         }
 329
 330         // We will now check for the system values.
 331         // This limit could be reached although the user limits are fine.
 332         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 333         if (!$r)
 334                 return false;
 335
 336         $max = intval($r[0]["Value"]);
 337         if ($max == 0)
 338                 return false;
 339
 340         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 341         if (!$r)
 342                 return false;
 343
 344         $used = intval($r[0]["Value"]);
 345         if ($used == 0)
 346                 return false;
 347
 348         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 349
 350         $level = $used / $max * 100;
 351
 352         if ($level < $maxlevel)
 353                 return false;
 354
 355         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 356         return true;
 357 }
 358
 359 /**
 360  * @brief fix the queue entry if the worker process died
 361  *
 362  */
 363 function poller_kill_stale_workers() {
 364         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 365
 366         if (!dbm::is_result($r)) {
 367                 // No processing here needed
 368                 return;
 369         }
 370
 371         foreach ($r AS $pid) {
 372                 if (!posix_kill($pid["pid"], 0)) {
 373                         q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = 0 WHERE `pid` = %d",
 374                                 dbesc(NULL_DATE), intval($pid["pid"]));
 375                 } else {
 376                         // Kill long running processes
 377
 378                         // Check if the priority is in a valid range
 379                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
 380                                 $pid["priority"] = PRIORITY_MEDIUM;
 381
 382                         // Define the maximum durations
 383                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 384                         $max_duration = $max_duration_defaults[$pid["priority"]];
 385
 386                         $argv = json_decode($pid["parameter"]);
 387                         $argv[0] = basename($argv[0]);
 388
 389                         // How long is the process already running?
 390                         $duration = (time() - strtotime($pid["executed"])) / 60;
 391                         if ($duration > $max_duration) {
 392                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 393                                 posix_kill($pid["pid"], SIGTERM);
 394
 395                                 // We killed the stale process.
 396                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 397                                 // Additionally we are lowering the priority.
 398                                 q("UPDATE `workerqueue` SET `executed` = '%s', `created` = '%s',
 399                                                         `priority` = %d, `pid` = 0 WHERE `pid` = %d",
 400                                         dbesc(NULL_DATE),
 401                                         dbesc(datetime_convert()),
 402                                         intval(PRIORITY_NEGLIGIBLE),
 403                                         intval($pid["pid"]));
 404                         } else {
 405                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 406                         }
 407                 }
 408         }
 409 }
 410
 411 /**
 412  * @brief Checks if the number of active workers exceeds the given limits
 413  *
 414  * @return bool Are there too much workers running?
 415  */
 416 function poller_too_much_workers() {
 417         $queues = Config::get("system", "worker_queues", 4);
 418
 419         $maxqueues = $queues;
 420
 421         $active = poller_active_workers();
 422
 423         // Decrease the number of workers at higher load
 424         $load = current_load();
 425         if($load) {
 426                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 427
 428                 $maxworkers = $queues;
 429
 430                 // Some magical mathemathics to reduce the workers
 431                 $exponent = 3;
 432                 $slope = $maxworkers / pow($maxsysload, $exponent);
 433                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 434
 435                 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
 436                 $entries = $s[0]["total"];
 437
 438                 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
 439                         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 440                         $top_priority = $s[0]["priority"];
 441
 442                         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 443                                 intval($top_priority), dbesc(NULL_DATE));
 444                         $high_running = dbm::is_result($s);
 445
 446                         if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
 447                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 448                                 $queues = $active + 1;
 449                         }
 450                 }
 451
 452                 // Create a list of queue entries grouped by their priority
 453                 $running = array(PRIORITY_CRITICAL => 0,
 454                                 PRIORITY_HIGH => 0,
 455                                 PRIORITY_MEDIUM => 0,
 456                                 PRIORITY_LOW => 0,
 457                                 PRIORITY_NEGLIGIBLE => 0);
 458
 459                 $r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
 460                 if (dbm::is_result($r))
 461                         foreach ($r AS $process)
 462                                 $running[$process["priority"]] = $process["running"];
 463
 464                 $processlist = "";
 465                 $r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 466                 if (dbm::is_result($r))
 467                         foreach ($r as $entry) {
 468                                 if ($processlist != "")
 469                                         $processlist .= ", ";
 470                                 $processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
 471                         }
 472
 473                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 474
 475                 // Are there fewer workers running as possible? Then fork a new one.
 476                 if (!Config::get("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
 477                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 478                         $args = array("include/poller.php", "no_cron");
 479                         $a = get_app();
 480                         $a->proc_run($args);
 481                 }
 482         }
 483
 484         return($active >= $queues);
 485 }
 486
 487 /**
 488  * @brief Returns the number of active poller processes
 489  *
 490  * @return integer Number of active poller processes
 491  */
 492 function poller_active_workers() {
 493         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 494
 495         return($workers[0]["processes"]);
 496 }
 497
 498 /**
 499  * @brief Check if we should pass some slow processes
 500  *
 501  * When the active processes of the highest priority are using more than 2/3
 502  * of all processes, we let pass slower processes.
 503  *
 504  * @param string $highest_priority Returns the currently highest priority
 505  * @return bool We let pass a slower process than $highest_priority
 506  */
 507 function poller_passing_slow(&$highest_priority) {
 508
 509         $highest_priority = 0;
 510
 511         $r = q("SELECT `priority`
 512                 FROM `process`
 513                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 514
 515         // No active processes at all? Fine
 516         if (!dbm::is_result($r))
 517                 return(false);
 518
 519         $priorities = array();
 520         foreach ($r AS $line)
 521                 $priorities[] = $line["priority"];
 522
 523         // Should not happen
 524         if (count($priorities) == 0)
 525                 return(false);
 526
 527         $highest_priority = min($priorities);
 528
 529         // The highest process is already the slowest one?
 530         // Then we quit
 531         if ($highest_priority == PRIORITY_NEGLIGIBLE)
 532                 return(false);
 533
 534         $high = 0;
 535         foreach ($priorities AS $priority)
 536                 if ($priority == $highest_priority)
 537                         ++$high;
 538
 539         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 540         $passing_slow = (($high/count($priorities)) > (2/3));
 541
 542         if ($passing_slow)
 543                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 544
 545         return($passing_slow);
 546 }
 547
 548 /**
 549  * @brief Returns the next worker process
 550  *
 551  * @return string SQL statement
 552  */
 553 function poller_worker_process() {
 554
 555         q("START TRANSACTION;");
 556
 557         // Check if we should pass some low priority process
 558         $highest_priority = 0;
 559
 560         if (poller_passing_slow($highest_priority)) {
 561                 // Are there waiting processes with a higher priority than the currently highest?
 562                 $r = q("SELECT * FROM `workerqueue`
 563                                 WHERE `executed` <= '%s' AND `priority` < %d
 564                                 ORDER BY `priority`, `created` LIMIT 1",
 565                                 dbesc(NULL_DATE),
 566                                 intval($highest_priority));
 567                 if (dbm::is_result($r)) {
 568                         return $r;
 569                 }
 570                 // Give slower processes some processing time
 571                 $r = q("SELECT * FROM `workerqueue`
 572                                 WHERE `executed` <= '%s' AND `priority` > %d
 573                                 ORDER BY `priority`, `created` LIMIT 1",
 574                                 dbesc(NULL_DATE),
 575                                 intval($highest_priority));
 576         }
 577
 578         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 579         if (($highest_priority == 0) OR !dbm::is_result($r)) {
 580                 $r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1", dbesc(NULL_DATE));
 581         }
 582         return $r;
 583 }
 584
 585 /**
 586  * @brief Call the front end worker
 587  */
 588 function call_worker() {
 589         if (!Config::get("system", "frontend_worker")) {
 590                 return;
 591         }
 592
 593         $url = App::get_baseurl()."/worker";
 594         fetch_url($url, false, $redirects, 1);
 595 }
 596
 597 /**
 598  * @brief Call the front end worker if there aren't any active
 599  */
 600 function call_worker_if_idle() {
 601         if (!Config::get("system", "frontend_worker")) {
 602                 return;
 603         }
 604
 605         // Do we have "proc_open"? Then we can fork the poller
 606         if (function_exists("proc_open")) {
 607                 // When was the last time that we called the worker?
 608                 // Less than one minute? Then we quit
 609                 if ((time() - Config::get("system", "worker_started")) < 60) {
 610                         return;
 611                 }
 612
 613                 set_config("system", "worker_started", time());
 614
 615                 // Do we have enough running workers? Then we quit here.
 616                 if (poller_too_much_workers()) {
 617                         // Cleaning dead processes
 618                         poller_kill_stale_workers();
 619                         get_app()->remove_inactive_processes();
 620
 621                         return;
 622                 }
 623
 624                 poller_run_cron();
 625
 626                 logger('Call poller', LOGGER_DEBUG);
 627
 628                 $args = array("include/poller.php", "no_cron");
 629                 $a = get_app();
 630                 $a->proc_run($args);
 631                 return;
 632         }
 633
 634         // We cannot execute background processes.
 635         // We now run the processes from the frontend.
 636         // This won't work with long running processes.
 637         poller_run_cron();
 638
 639         clear_worker_processes();
 640
 641         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 642
 643         if ($workers[0]["processes"] == 0) {
 644                 call_worker();
 645         }
 646 }
 647
 648 /**
 649  * @brief Removes long running worker processes
 650  */
 651 function clear_worker_processes() {
 652         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 653
 654         /// @todo We should clean up the corresponding workerqueue entries as well
 655         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 656                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 657 }
 658
 659 /**
 660  * @brief Runs the cron processes
 661  */
 662 function poller_run_cron() {
 663         logger('Add cron entries', LOGGER_DEBUG);
 664
 665         // Check for spooled items
 666         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 667
 668         // Run the cron job that calls all other jobs
 669         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 670
 671         // Run the cronhooks job separately from cron for being able to use a different timing
 672         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 673
 674         // Cleaning dead processes
 675         poller_kill_stale_workers();
 676 }
 677
 678 if (array_search(__file__,get_included_files())===0){
 679         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 680
 681         get_app()->end_process();
 682
 683         killme();
 684 }
 685 ?>