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         $a->start_process();
  39
  40         if (poller_max_connections_reached()) {
  41                 return;
  42         }
  43
  44         if ($a->maxload_reached()) {
  45                 return;
  46         }
  47
  48         if(($argc <= 1) OR ($argv[1] != "no_cron")) {
  49                 poller_run_cron();
  50         }
  51
  52         if ($a->max_processes_reached()) {
  53                 return;
  54         }
  55
  56         // Checking the number of workers
  57         if (poller_too_much_workers()) {
  58                 poller_kill_stale_workers();
  59                 return;
  60         }
  61
  62         $starttime = time();
  63
  64         while ($r = poller_worker_process()) {
  65
  66                 // Count active workers and compare them with a maximum value that depends on the load
  67                 if (poller_too_much_workers()) {
  68                         return;
  69                 }
  70
  71                 if (!poller_execute($r[0])) {
  72                         return;
  73                 }
  74
  75                 // Quit the poller once every hour
  76                 if (time() > ($starttime + 3600))
  77                         return;
  78         }
  79
  80 }
  81
  82 /**
  83  * @brief Execute a worker entry
  84  *
  85  * @param array $queue Workerqueue entry
  86  *
  87  * @return boolean "true" if further processing should be stopped
  88  */
  89 function poller_execute($queue) {
  90
  91         $a = get_app();
  92
  93         $mypid = getmypid();
  94
  95         // Quit when in maintenance
  96         if (Config::get('system', 'maintenance', true)) {
  97                 return false;
  98         }
  99
 100         // Constantly check the number of parallel database processes
 101         if ($a->max_processes_reached()) {
 102                 return false;
 103         }
 104
 105         // Constantly check the number of available database connections to let the frontend be accessible at any time
 106         if (poller_max_connections_reached()) {
 107                 return false;
 108         }
 109
 110         $upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
 111                 dbesc(datetime_convert()),
 112                 intval($mypid),
 113                 intval($queue["id"]));
 114
 115         if (!$upd) {
 116                 logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
 117                 q("COMMIT");
 118                 return true;
 119         }
 120
 121         // Assure that there are no tasks executed twice
 122         $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 123         if (!$id) {
 124                 logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
 125                 q("COMMIT");
 126                 return true;
 127         } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
 128                 logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
 129                 q("COMMIT");
 130                 return true;
 131         } elseif ($id[0]["pid"] != $mypid) {
 132                 logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
 133                 q("COMMIT");
 134                 return true;
 135         }
 136         q("COMMIT");
 137
 138         $argv = json_decode($queue["parameter"]);
 139
 140         // Check for existance and validity of the include file
 141         $include = $argv[0];
 142
 143         if (!validate_include($include)) {
 144                 logger("Include file ".$argv[0]." is not valid!");
 145                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 146                 return true;
 147         }
 148
 149         require_once($include);
 150
 151         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 152
 153         if (function_exists($funcname)) {
 154
 155                 poller_exec_function($queue, $funcname, $argv);
 156
 157                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 158         } else {
 159                 logger("Function ".$funcname." does not exist");
 160         }
 161
 162         return true;
 163 }
 164
 165 /**
 166  * @brief Execute a function from the queue
 167  *
 168  * @param array $queue Workerqueue entry
 169  * @param string $funcname name of the function
 170  * @param array $argv Array of values to be passed to the function
 171  */
 172 function poller_exec_function($queue, $funcname, $argv) {
 173
 174         $a = get_app();
 175
 176         $mypid = getmypid();
 177
 178         $argc = count($argv);
 179
 180         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 181
 182         $stamp = (float)microtime(true);
 183
 184         // We use the callstack here to analyze the performance of executed worker entries.
 185         // For this reason the variables have to be initialized.
 186         if (Config::get("system", "profiler")) {
 187                 $a->performance["start"] = microtime(true);
 188                 $a->performance["database"] = 0;
 189                 $a->performance["database_write"] = 0;
 190                 $a->performance["network"] = 0;
 191                 $a->performance["file"] = 0;
 192                 $a->performance["rendering"] = 0;
 193                 $a->performance["parser"] = 0;
 194                 $a->performance["marktime"] = 0;
 195                 $a->performance["markstart"] = microtime(true);
 196                 $a->callstack = array();
 197         }
 198
 199         // For better logging create a new process id for every worker call
 200         // But preserve the old one for the worker
 201         $old_process_id = $a->process_id;
 202         $a->process_id = uniqid("wrk", true);
 203
 204         $funcname($argv, $argc);
 205
 206         $a->process_id = $old_process_id;
 207
 208         $duration = number_format(microtime(true) - $stamp, 3);
 209
 210         if ($duration > 3600) {
 211                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 212         } elseif ($duration > 600) {
 213                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 214         } elseif ($duration > 300) {
 215                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 216         } elseif ($duration > 120) {
 217                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 218         }
 219
 220         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 221
 222         // Write down the performance values into the log
 223         if (Config::get("system", "profiler")) {
 224                 $duration = microtime(true)-$a->performance["start"];
 225
 226                 if (Config::get("rendertime", "callstack")) {
 227                         if (isset($a->callstack["database"])) {
 228                                 $o = "\nDatabase Read:\n";
 229                                 foreach ($a->callstack["database"] AS $func => $time) {
 230                                         $time = round($time, 3);
 231                                         if ($time > 0)
 232                                                 $o .= $func.": ".$time."\n";
 233                                 }
 234                         }
 235                         if (isset($a->callstack["database_write"])) {
 236                                 $o .= "\nDatabase Write:\n";
 237                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 238                                         $time = round($time, 3);
 239                                         if ($time > 0)
 240                                                 $o .= $func.": ".$time."\n";
 241                                 }
 242                         }
 243                         if (isset($a->callstack["network"])) {
 244                                 $o .= "\nNetwork:\n";
 245                                 foreach ($a->callstack["network"] AS $func => $time) {
 246                                         $time = round($time, 3);
 247                                         if ($time > 0)
 248                                                 $o .= $func.": ".$time."\n";
 249                                 }
 250                         }
 251                 } else {
 252                         $o = '';
 253                 }
 254
 255                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 256                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 257                         number_format($a->performance["database_write"], 2),
 258                         number_format($a->performance["network"], 2),
 259                         number_format($a->performance["file"], 2),
 260                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 261                         number_format($duration, 2)),
 262                         LOGGER_DEBUG);
 263         }
 264
 265         $cooldown = Config::get("system", "worker_cooldown", 0);
 266
 267         if ($cooldown > 0) {
 268                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 269                 sleep($cooldown);
 270         }
 271 }
 272
 273 /**
 274  * @brief Checks if the number of database connections has reached a critical limit.
 275  *
 276  * @return bool Are more than 3/4 of the maximum connections used?
 277  */
 278 function poller_max_connections_reached() {
 279
 280         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 281         $max = Config::get("system", "max_connections");
 282
 283         // Fetch the percentage level where the poller will get active
 284         $maxlevel = Config::get("system", "max_connections_level", 75);
 285
 286         if ($max == 0) {
 287                 // the maximum number of possible user connections can be a system variable
 288                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 289                 if ($r)
 290                         $max = $r[0]["Value"];
 291
 292                 // Or it can be granted. This overrides the system variable
 293                 $r = q("SHOW GRANTS");
 294                 if ($r)
 295                         foreach ($r AS $grants) {
 296                                 $grant = array_pop($grants);
 297                                 if (stristr($grant, "GRANT USAGE ON"))
 298                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
 299                                                 $max = $match[1];
 300                         }
 301         }
 302
 303         // If $max is set we will use the processlist to determine the current number of connections
 304         // The processlist only shows entries of the current user
 305         if ($max != 0) {
 306                 $r = q("SHOW PROCESSLIST");
 307                 if (!dbm::is_result($r))
 308                         return false;
 309
 310                 $used = count($r);
 311
 312                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 313
 314                 $level = ($used / $max) * 100;
 315
 316                 if ($level >= $maxlevel) {
 317                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 318                         return true;
 319                 }
 320         }
 321
 322         // We will now check for the system values.
 323         // This limit could be reached although the user limits are fine.
 324         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 325         if (!$r)
 326                 return false;
 327
 328         $max = intval($r[0]["Value"]);
 329         if ($max == 0)
 330                 return false;
 331
 332         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 333         if (!$r)
 334                 return false;
 335
 336         $used = intval($r[0]["Value"]);
 337         if ($used == 0)
 338                 return false;
 339
 340         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 341
 342         $level = $used / $max * 100;
 343
 344         if ($level < $maxlevel)
 345                 return false;
 346
 347         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 348         return true;
 349 }
 350
 351 /**
 352  * @brief fix the queue entry if the worker process died
 353  *
 354  */
 355 function poller_kill_stale_workers() {
 356         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
 357
 358         if (!dbm::is_result($r)) {
 359                 // No processing here needed
 360                 return;
 361         }
 362
 363         foreach($r AS $pid)
 364                 if (!posix_kill($pid["pid"], 0))
 365                         q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
 366                                 intval($pid["pid"]));
 367                 else {
 368                         // Kill long running processes
 369
 370                         // Check if the priority is in a valid range
 371                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
 372                                 $pid["priority"] = PRIORITY_MEDIUM;
 373
 374                         // Define the maximum durations
 375                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 376                         $max_duration = $max_duration_defaults[$pid["priority"]];
 377
 378                         $argv = json_decode($pid["parameter"]);
 379                         $argv[0] = basename($argv[0]);
 380
 381                         // How long is the process already running?
 382                         $duration = (time() - strtotime($pid["executed"])) / 60;
 383                         if ($duration > $max_duration) {
 384                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 385                                 posix_kill($pid["pid"], SIGTERM);
 386
 387                                 // We killed the stale process.
 388                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 389                                 // Additionally we are lowering the priority.
 390                                 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `created` = '%s',
 391                                                         `priority` = %d, `pid` = 0 WHERE `pid` = %d",
 392                                         dbesc(datetime_convert()),
 393                                         intval(PRIORITY_NEGLIGIBLE),
 394                                         intval($pid["pid"]));
 395                         } else
 396                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 397                 }
 398 }
 399
 400 /**
 401  * @brief Checks if the number of active workers exceeds the given limits
 402  *
 403  * @return bool Are there too much workers running?
 404  */
 405 function poller_too_much_workers() {
 406         $queues = Config::get("system", "worker_queues", 4);
 407
 408         $maxqueues = $queues;
 409
 410         $active = poller_active_workers();
 411
 412         // Decrease the number of workers at higher load
 413         $load = current_load();
 414         if($load) {
 415                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 416
 417                 $maxworkers = $queues;
 418
 419                 // Some magical mathemathics to reduce the workers
 420                 $exponent = 3;
 421                 $slope = $maxworkers / pow($maxsysload, $exponent);
 422                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 423
 424                 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
 425                 $entries = $s[0]["total"];
 426
 427                 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
 428                         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
 429                         $top_priority = $s[0]["priority"];
 430
 431                         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00' LIMIT 1",
 432                                 intval($top_priority));
 433                         $high_running = dbm::is_result($s);
 434
 435                         if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
 436                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 437                                 $queues = $active + 1;
 438                         }
 439                 }
 440
 441                 // Create a list of queue entries grouped by their priority
 442                 $running = array(PRIORITY_CRITICAL => 0,
 443                                 PRIORITY_HIGH => 0,
 444                                 PRIORITY_MEDIUM => 0,
 445                                 PRIORITY_LOW => 0,
 446                                 PRIORITY_NEGLIGIBLE => 0);
 447
 448                 $r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
 449                 if (dbm::is_result($r))
 450                         foreach ($r AS $process)
 451                                 $running[$process["priority"]] = $process["running"];
 452
 453                 $processlist = "";
 454                 $r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 455                 if (dbm::is_result($r))
 456                         foreach ($r as $entry) {
 457                                 if ($processlist != "")
 458                                         $processlist .= ", ";
 459                                 $processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
 460                         }
 461
 462                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 463
 464                 // Are there fewer workers running as possible? Then fork a new one.
 465                 if (!Config::get("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
 466                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 467                         $args = array("php", "include/poller.php", "no_cron");
 468                         $a = get_app();
 469                         $a->proc_run($args);
 470                 }
 471         }
 472
 473         return($active >= $queues);
 474 }
 475
 476 /**
 477  * @brief Returns the number of active poller processes
 478  *
 479  * @return integer Number of active poller processes
 480  */
 481 function poller_active_workers() {
 482         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 483
 484         return($workers[0]["processes"]);
 485 }
 486
 487 /**
 488  * @brief Check if we should pass some slow processes
 489  *
 490  * When the active processes of the highest priority are using more than 2/3
 491  * of all processes, we let pass slower processes.
 492  *
 493  * @param string $highest_priority Returns the currently highest priority
 494  * @return bool We let pass a slower process than $highest_priority
 495  */
 496 function poller_passing_slow(&$highest_priority) {
 497
 498         $highest_priority = 0;
 499
 500         $r = q("SELECT `priority`
 501                 FROM `process`
 502                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 503
 504         // No active processes at all? Fine
 505         if (!dbm::is_result($r))
 506                 return(false);
 507
 508         $priorities = array();
 509         foreach ($r AS $line)
 510                 $priorities[] = $line["priority"];
 511
 512         // Should not happen
 513         if (count($priorities) == 0)
 514                 return(false);
 515
 516         $highest_priority = min($priorities);
 517
 518         // The highest process is already the slowest one?
 519         // Then we quit
 520         if ($highest_priority == PRIORITY_NEGLIGIBLE)
 521                 return(false);
 522
 523         $high = 0;
 524         foreach ($priorities AS $priority)
 525                 if ($priority == $highest_priority)
 526                         ++$high;
 527
 528         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 529         $passing_slow = (($high/count($priorities)) > (2/3));
 530
 531         if ($passing_slow)
 532                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 533
 534         return($passing_slow);
 535 }
 536
 537 /**
 538  * @brief Returns the next worker process
 539  *
 540  * @return string SQL statement
 541  */
 542 function poller_worker_process() {
 543
 544         q("START TRANSACTION;");
 545
 546         // Check if we should pass some low priority process
 547         $highest_priority = 0;
 548
 549         if (poller_passing_slow($highest_priority)) {
 550                 // Are there waiting processes with a higher priority than the currently highest?
 551                 $r = q("SELECT * FROM `workerqueue`
 552                                 WHERE `executed` = '0000-00-00 00:00:00' AND `priority` < %d
 553                                 ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
 554                 if (dbm::is_result($r))
 555                         return $r;
 556
 557                 // Give slower processes some processing time
 558                 $r = q("SELECT * FROM `workerqueue`
 559                                 WHERE `executed` = '0000-00-00 00:00:00' AND `priority` > %d
 560                                 ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
 561         }
 562
 563         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 564         if (($highest_priority == 0) OR !dbm::is_result($r))
 565                 $r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1");
 566
 567         return $r;
 568 }
 569
 570 /**
 571  * @brief Call the front end worker
 572  */
 573 function call_worker() {
 574         if (!Config::get("system", "frontend_worker") OR !Config::get("system", "worker")) {
 575                 return;
 576         }
 577
 578         $url = App::get_baseurl()."/worker";
 579         fetch_url($url, false, $redirects, 1);
 580 }
 581
 582 /**
 583  * @brief Call the front end worker if there aren't any active
 584  */
 585 function call_worker_if_idle() {
 586         if (!Config::get("system", "frontend_worker") OR !Config::get("system", "worker")) {
 587                 return;
 588         }
 589
 590         // Do we have "proc_open"? Then we can fork the poller
 591         if (function_exists("proc_open")) {
 592                 // When was the last time that we called the worker?
 593                 // Less than one minute? Then we quit
 594                 if ((time() - Config::get("system", "worker_started")) < 60) {
 595                         return;
 596                 }
 597
 598                 set_config("system", "worker_started", time());
 599
 600                 // Do we have enough running workers? Then we quit here.
 601                 if (poller_too_much_workers()) {
 602                         // Cleaning dead processes
 603                         poller_kill_stale_workers();
 604                         get_app()->remove_inactive_processes();
 605
 606                         return;
 607                 }
 608
 609                 poller_run_cron();
 610
 611                 logger('Call poller', LOGGER_DEBUG);
 612
 613                 $args = array("php", "include/poller.php", "no_cron");
 614                 $a = get_app();
 615                 $a->proc_run($args);
 616                 return;
 617         }
 618
 619         // We cannot execute background processes.
 620         // We now run the processes from the frontend.
 621         // This won't work with long running processes.
 622         poller_run_cron();
 623
 624         clear_worker_processes();
 625
 626         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 627
 628         if ($workers[0]["processes"] == 0) {
 629                 call_worker();
 630         }
 631 }
 632
 633 /**
 634  * @brief Removes long running worker processes
 635  */
 636 function clear_worker_processes() {
 637         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 638
 639         /// @todo We should clean up the corresponding workerqueue entries as well
 640         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 641                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 642 }
 643
 644 /**
 645  * @brief Runs the cron processes
 646  */
 647 function poller_run_cron() {
 648         logger('Add cron entries', LOGGER_DEBUG);
 649
 650         // Check for spooled items
 651         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 652
 653         // Run the cron job that calls all other jobs
 654         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 655
 656         // Run the cronhooks job separately from cron for being able to use a different timing
 657         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 658
 659         // Cleaning dead processes
 660         poller_kill_stale_workers();
 661 }
 662
 663 if (array_search(__file__,get_included_files())===0){
 664         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 665
 666         get_app()->end_process();
 667
 668         killme();
 669 }
 670 ?>