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Editing: class-sliced-semaphore.php

<?php
// Exit if accessed directly
if ( ! defined('ABSPATH') ) { exit; }

/**
 * Semaphore Lock Management
 *
 * @since      3.4.0
 */
final class Sliced_Semaphore {

/**
	 * Initializes the semaphore object.
	 *
	 * @static
	 * @return Sliced_Semaphore
	 */
	public static function factory() {
		return new self;
	}

/**
	 * @var bool
	 */
	protected $lock_broke = false;

/**
	 * Attempts to start the lock. If the rename works, the lock is started.
	 *
	 * @return bool
	 */
	public function lock() {
		global $wpdb;

// Attempt to set the lock
		$affected = $wpdb->query("
			UPDATE $wpdb->options
			   SET option_name = 'sliced_locked'
			 WHERE option_name = 'sliced_unlocked'
		");

if ($affected == '0' and !$this->stuck_check()) {
			return false;
		}

// Check to see if all processes are complete
		$affected = $wpdb->query("
			UPDATE $wpdb->options
			   SET option_value = CAST(option_value AS UNSIGNED) + 1
			 WHERE option_name = 'sliced_semaphore'
			   AND option_value = '0'
		");
		if ($affected != '1') {
			if (!$this->stuck_check()) {
				return false;
			}

// Reset the semaphore to 1
			$wpdb->query("
				UPDATE $wpdb->options
				   SET option_value = '1'
				 WHERE option_name = 'sliced_semaphore'
			");
		}

// Set the lock time
		$wpdb->query($wpdb->prepare("
			UPDATE $wpdb->options
			   SET option_value = %s
			 WHERE option_name = 'sliced_last_lock_time'
		", current_time('mysql', 1)));
		return true;
	}

/**
	 * Increment the semaphore.
	 *
	 * @param  array  $filters
	 * @return Sliced_Semaphore
	 */
	public function increment(array $filters = array()) {
		global $wpdb;

if (count($filters)) {
			// Loop through all of the filters and increment the semaphore
			foreach ($filters as $priority) {
				for ($i = 0, $j = count($priority); $i < $j; ++$i) {
					$this->increment();
				}
			}
		}
		else {
			$wpdb->query("
				UPDATE $wpdb->options
				   SET option_value = CAST(option_value AS UNSIGNED) + 1
				 WHERE option_name = 'sliced_semaphore'
			");
		}

return $this;
	}

/**
	 * Decrements the semaphore.
	 *
	 * @return void
	 */
	public function decrement() {
		global $wpdb;

$wpdb->query("
			UPDATE $wpdb->options
			   SET option_value = CAST(option_value AS UNSIGNED) - 1
			 WHERE option_name = 'sliced_semaphore'
			   AND CAST(option_value AS UNSIGNED) > 0
		");
	}

/**
	 * Unlocks the process.
	 *
	 * @return bool
	 */
	public function unlock() {
		global $wpdb;

// Decrement for the master process.
		$this->decrement();

$result = $wpdb->query("
			UPDATE $wpdb->options
			   SET option_name = 'sliced_unlocked'
			 WHERE option_name = 'sliced_locked'
		");

if ($result == '1') {
			return true;
		}

return false;
	}

/**
	 * Attempts to jiggle the stuck lock loose.
	 *
	 * @return bool
	 */
	private function stuck_check() {
		global $wpdb;

// Check to see if we already broke the lock.
		if ($this->lock_broke) {
			return true;
		}

$current_time = current_time('mysql', 1);
		$unlock_time = gmdate('Y-m-d H:i:s', time() - 30 * 60);
		$affected = $wpdb->query($wpdb->prepare("
			UPDATE $wpdb->options
			   SET option_value = %s
			 WHERE option_name = 'sliced_last_lock_time'
			   AND option_value <= %s
		", $current_time, $unlock_time));

if ($affected == '1') {
			$this->lock_broke = true;
			return true;
		}

return false;
	}

} // End Sliced_Semaphore

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Editing: class-sliced-semaphore.php

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