sforkowany z mirror/friendica
79 wiersze
2.2 KiB
PHP
79 wiersze
2.2 KiB
PHP
<?php
|
|
|
|
// Provide some ability to lock a PHP function so that multiple processes
|
|
// can't run the function concurrently
|
|
if(! function_exists('lock_function')) {
|
|
function lock_function($fn_name, $block = true, $wait_sec = 2, $timeout = 30) {
|
|
if( $wait_sec == 0 )
|
|
$wait_sec = 2; // don't let the user pick a value that's likely to crash the system
|
|
|
|
$got_lock = false;
|
|
$start = time();
|
|
|
|
do {
|
|
q("LOCK TABLE `locks` WRITE");
|
|
$r = q("SELECT `locked`, `created` FROM `locks` WHERE `name` = '%s' LIMIT 1",
|
|
dbesc($fn_name)
|
|
);
|
|
|
|
if((dbm::is_result($r)) AND (!$r[0]['locked'] OR (strtotime($r[0]['created']) < time() - 3600))) {
|
|
q("UPDATE `locks` SET `locked` = 1, `created` = '%s' WHERE `name` = '%s'",
|
|
dbesc(datetime_convert()),
|
|
dbesc($fn_name)
|
|
);
|
|
$got_lock = true;
|
|
}
|
|
elseif (! dbm::is_result($r)) {
|
|
/// @TODO the Boolean value for count($r) should be equivalent to the Boolean value of $r
|
|
q("INSERT INTO `locks` (`name`, `created`, `locked`) VALUES ('%s', '%s', 1)",
|
|
dbesc($fn_name),
|
|
dbesc(datetime_convert())
|
|
);
|
|
$got_lock = true;
|
|
}
|
|
|
|
q("UNLOCK TABLES");
|
|
|
|
if(($block) && (! $got_lock))
|
|
sleep($wait_sec);
|
|
|
|
} while(($block) && (! $got_lock) && ((time() - $start) < $timeout));
|
|
|
|
logger('lock_function: function ' . $fn_name . ' with blocking = ' . $block . ' got_lock = ' . $got_lock . ' time = ' . (time() - $start), LOGGER_DEBUG);
|
|
|
|
return $got_lock;
|
|
}}
|
|
|
|
|
|
if(! function_exists('block_on_function_lock')) {
|
|
function block_on_function_lock($fn_name, $wait_sec = 2, $timeout = 30) {
|
|
if( $wait_sec == 0 )
|
|
$wait_sec = 2; // don't let the user pick a value that's likely to crash the system
|
|
|
|
$start = time();
|
|
|
|
do {
|
|
$r = q("SELECT locked FROM locks WHERE name = '%s' LIMIT 1",
|
|
dbesc($fn_name)
|
|
);
|
|
|
|
if (dbm::is_result($r) && $r[0]['locked'])
|
|
sleep($wait_sec);
|
|
|
|
} while(dbm::is_result($r) && $r[0]['locked'] && ((time() - $start) < $timeout));
|
|
|
|
return;
|
|
}}
|
|
|
|
|
|
if(! function_exists('unlock_function')) {
|
|
function unlock_function($fn_name) {
|
|
$r = q("UPDATE `locks` SET `locked` = 0, `created` = '0000-00-00 00:00:00' WHERE `name` = '%s'",
|
|
dbesc($fn_name)
|
|
);
|
|
|
|
logger('unlock_function: released lock for function ' . $fn_name, LOGGER_DEBUG);
|
|
|
|
return;
|
|
}}
|