63 lines
1.5 KiB
PHP
63 lines
1.5 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
namespace Friendica\Util;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file src/Util/Lock.php
|
||
|
|
* @brief Functions for preventing parallel execution of functions
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
use dba;
|
||
|
|
use dbm;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief This class contain Functions for preventing parallel execution of functions
|
||
|
|
*/
|
||
|
|
class Lock {
|
||
|
|
|
||
|
|
|
||
|
|
// Provide some ability to lock a PHP function so that multiple processes
|
||
|
|
// can't run the function concurrently
|
||
|
|
|
||
|
|
public static function set($fn_name, $wait_sec = 2, $timeout = 30) {
|
||
|
|
if ($wait_sec == 0) {
|
||
|
|
$wait_sec = 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
$got_lock = false;
|
||
|
|
$start = time();
|
||
|
|
|
||
|
|
do {
|
||
|
|
dba:p("LOCK TABLE `locks` WRITE");
|
||
|
|
$lock = dba::select('locks', array('locked'), array('name' => $fn_name), array('limit' => 1));
|
||
|
|
|
||
|
|
if ((dbm::is_result($lock)) AND !$lock['locked']) {
|
||
|
|
dba::update('locks', array('locked' => true), array('name' => $fn_name));
|
||
|
|
$got_lock = true;
|
||
|
|
} elseif (!dbm::is_result($lock)) {
|
||
|
|
dbm::insert('locks', array('name' => $fn_name, 'locked' => true));
|
||
|
|
$got_lock = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
dbm::p("UNLOCK TABLES");
|
||
|
|
|
||
|
|
if (!$got_lock) {
|
||
|
|
sleep($wait_sec);
|
||
|
|
}
|
||
|
|
} while (!$got_lock AND ((time() - $start) < $timeout));
|
||
|
|
|
||
|
|
logger('lock_function: function ' . $fn_name . ' with blocking = ' . $block . ' got_lock = ' . $got_lock . ' time = ' . (time() - $start), LOGGER_DEBUG);
|
||
|
|
|
||
|
|
return $got_lock;
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function remove($fn_name) {
|
||
|
|
dba::update('locks', array('locked' => false), array('name' => $fn_name));
|
||
|
|
|
||
|
|
logger('unlock_function: released lock for function ' . $fn_name, LOGGER_DEBUG);
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|