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File: lock.inc
<?php /** * @file * A database-mediated implementation of a locking mechanism. */ /** * @defgroup lock Locking mechanisms * @{ * Functions to coordinate long-running operations across requests. * * In most environments, multiple Drupal page requests (a.k.a. threads or * processes) will execute in parallel. This leads to potential conflicts or * race conditions when two requests execute the same code at the same time. A * common example of this is a rebuild like menu_rebuild() where we invoke many * hook implementations to get and process data from all active modules, and * then delete the current data in the database to insert the new afterwards. * * This is a cooperative, advisory lock system. Any long-running operation * that could potentially be attempted in parallel by multiple requests should * try to acquire a lock before proceeding. By obtaining a lock, one request * notifies any other requests that a specific operation is in progress which * must not be executed in parallel. * * To use this API, pick a unique name for the lock. A sensible choice is the * name of the function performing the operation. A very simple example use of * this API: * @code * function mymodule_long_operation() { * if (lock_acquire('mymodule_long_operation')) { * // Do the long operation here. * // ... * lock_release('mymodule_long_operation'); * } * } * @endcode * * If a function acquires a lock it should always release it when the * operation is complete by calling lock_release(), as in the example. * * A function that has acquired a lock may attempt to renew a lock (extend the * duration of the lock) by calling lock_acquire() again during the operation. * Failure to renew a lock is indicative that another request has acquired * the lock, and that the current operation may need to be aborted. * * If a function fails to acquire a lock it may either immediately return, or * it may call lock_wait() if the rest of the current page request requires * that the operation in question be complete. After lock_wait() returns, * the function may again attempt to acquire the lock, or may simply allow the * page request to proceed on the assumption that a parallel request completed * the operation. * * lock_acquire() and lock_wait() will automatically break (delete) a lock * whose duration has exceeded the timeout specified when it was acquired. * * Alternative implementations of this API (such as APC) may be substituted * by setting the 'lock_inc' variable to an alternate include filepath. Since * this is an API intended to support alternative implementations, code using * this API should never rely upon specific implementation details (for example * no code should look for or directly modify a lock in the {semaphore} table). */ /** * Initialize the locking system. */ function lock_initialize() { global $locks; $locks = array(); } /** * Helper function to get this request's unique id. */ function _lock_id() { // Do not use drupal_static(). This identifier refers to the current // client request, and must not be changed under any circumstances // else the shutdown handler may fail to release our locks. static $lock_id; if (!isset($lock_id)) { // Assign a unique id. $lock_id = uniqid(mt_rand(), TRUE); // We only register a shutdown function if a lock is used. drupal_register_shutdown_function('lock_release_all', $lock_id); } return $lock_id; } /** * Acquire (or renew) a lock, but do not block if it fails. * * @param $name * The name of the lock. * @param $timeout * A number of seconds (float) before the lock expires (minimum of 0.001). * * @return * TRUE if the lock was acquired, FALSE if it failed. */ function lock_acquire($name, $timeout = 30.0) { global $locks; // Insure that the timeout is at least 1 ms. $timeout = max($timeout, 0.001); $expire = microtime(TRUE) + $timeout; if (isset($locks[$name])) { // Try to extend the expiration of a lock we already acquired. $success = (bool) db_update('semaphore') ->fields(array('expire' => $expire)) ->condition('name', $name) ->condition('value', _lock_id()) ->execute(); if (!$success) { // The lock was broken. unset($locks[$name]); } return $success; } else { // Optimistically try to acquire the lock, then retry once if it fails. // The first time through the loop cannot be a retry. $retry = FALSE; // We always want to do this code at least once. do { try { db_insert('semaphore') ->fields(array( 'name' => $name, 'value' => _lock_id(), 'expire' => $expire, )) ->execute(); // We track all acquired locks in the global variable. $locks[$name] = TRUE; // We never need to try again. $retry = FALSE; } catch (PDOException $e) { // Suppress the error. If this is our first pass through the loop, // then $retry is FALSE. In this case, the insert must have failed // meaning some other request acquired the lock but did not release it. // We decide whether to retry by checking lock_may_be_available() // Since this will break the lock in case it is expired. $retry = $retry ? FALSE : lock_may_be_available($name); } // We only retry in case the first attempt failed, but we then broke // an expired lock. } while ($retry); } return isset($locks[$name]); } /** * Check if lock acquired by a different process may be available. * * If an existing lock has expired, it is removed. * * @param $name * The name of the lock. * * @return * TRUE if there is no lock or it was removed, FALSE otherwise. */ function lock_may_be_available($name) { $lock = db_query('SELECT expire, value FROM {semaphore} WHERE name = :name', array(':name' => $name))->fetchAssoc(); if (!$lock) { return TRUE; } $expire = (float) $lock['expire']; $now = microtime(TRUE); if ($now > $expire) { // We check two conditions to prevent a race condition where another // request acquired the lock and set a new expire time. We add a small // number to $expire to avoid errors with float to string conversion. return (bool) db_delete('semaphore') ->condition('name', $name) ->condition('value', $lock['value']) ->condition('expire', 0.0001 + $expire, '<=') ->execute(); } return FALSE; } /** * Wait for a lock to be available. * * This function may be called in a request that fails to acquire a desired * lock. This will block further execution until the lock is available or the * specified delay in seconds is reached. This should not be used with locks * that are acquired very frequently, since the lock is likely to be acquired * again by a different request while waiting. * * @param $name * The name of the lock. * @param $delay * The maximum number of seconds to wait, as an integer. * * @return * TRUE if the lock holds, FALSE if it is available. */ function lock_wait($name, $delay = 30) { // Pause the process for short periods between calling // lock_may_be_available(). This prevents hitting the database with constant // database queries while waiting, which could lead to performance issues. // However, if the wait period is too long, there is the potential for a // large number of processes to be blocked waiting for a lock, especially // if the item being rebuilt is commonly requested. To address both of these // concerns, begin waiting for 25ms, then add 25ms to the wait period each // time until it reaches 500ms. After this point polling will continue every // 500ms until $delay is reached. // $delay is passed in seconds, but we will be using usleep(), which takes // microseconds as a parameter. Multiply it by 1 million so that all // further numbers are equivalent. $delay = (int) $delay * 1000000; // Begin sleeping at 25ms. $sleep = 25000; while ($delay > 0) { // This function should only be called by a request that failed to get a // lock, so we sleep first to give the parallel request a chance to finish // and release the lock. usleep($sleep); // After each sleep, increase the value of $sleep until it reaches // 500ms, to reduce the potential for a lock stampede. $delay = $delay - $sleep; $sleep = min(500000, $sleep + 25000, $delay); if (lock_may_be_available($name)) { // No longer need to wait. return FALSE; } } // The caller must still wait longer to get the lock. return TRUE; } /** * Release a lock previously acquired by lock_acquire(). * * This will release the named lock if it is still held by the current request. * * @param $name * The name of the lock. */ function lock_release($name) { global $locks; unset($locks[$name]); db_delete('semaphore') ->condition('name', $name) ->condition('value', _lock_id()) ->execute(); } /** * Release all previously acquired locks. */ function lock_release_all($lock_id = NULL) { global $locks; $locks = array(); if (empty($lock_id)) { $lock_id = _lock_id(); } db_delete('semaphore') ->condition('value', $lock_id) ->execute(); } /** * @} End of "defgroup lock". */
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