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<?php |
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/**************************************************************************** |
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* For license information see doc/license.txt |
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* |
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* Unicode Reminder メモ |
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* |
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* synchronization of processes which must not run concurrently; |
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****************************************************************************/ |
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namespace Oc\Util; |
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/** |
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* Class ProcessSync |
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*/ |
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class ProcessSync |
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{ |
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/** @var string $pidFilePath */ |
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private $pidFilePath; |
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/** |
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* ProcessSync constructor. |
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* |
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* @param $name |
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*/ |
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public function __construct($name) |
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{ |
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$this->pidFilePath = __DIR__ . '/../../../cache2/' . $name . '.pid'; |
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} |
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/** |
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* Enter code section which must not run concurrently |
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* |
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* @return bool |
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*/ |
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public function enter() |
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{ |
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if (!$this->checkDaemon()) { |
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return false; |
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} |
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if (file_exists($this->pidFilePath)) { |
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echo 'Error: PidFile (' . $this->pidFilePath . ") already present\n"; |
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return false; |
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} else { |
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if ($pidFile = @fopen($this->pidFilePath, 'w')) { |
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fwrite($pidFile, posix_getpid()); |
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fclose($pidFile); |
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return true; |
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} else { |
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echo "can't create PidFile " . $this->pidFilePath . "\n"; |
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return false; |
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} |
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} |
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} |
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/** |
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* checks if other instance of process is running |
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* |
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* @return bool |
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*/ |
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private function checkDaemon() |
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{ |
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if ($pidFile = @fopen($this->pidFilePath, 'r')) { |
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$pidDaemon = fgets($pidFile, 20); |
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fclose($pidFile); |
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$pidDaemon = (int)$pidDaemon; |
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// bad PID file, e.g. due to system malfunction while creating the file? |
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if ($pidDaemon <= 0) { |
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echo 'removing bad PidFile (' . $this->pidFilePath . ")\n"; |
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unlink($this->pidFilePath); |
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return false; |
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} // process running? |
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elseif (posix_kill($pidDaemon, 0)) { |
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// yes, good bye |
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echo 'Error: process for ' . $this->pidFilePath . " is already running with pid=$pidDaemon\n"; |
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return false; |
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} else { |
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// no, remove pid_file |
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echo 'process not running, removing old PidFile (' . $this->pidFilePath . ")\n"; |
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unlink($this->pidFilePath); |
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return true; |
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} |
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} else { |
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return true; |
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} |
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} |
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/** |
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* Leave code section which must not run concurrently |
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* |
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* @param bool $message |
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*/ |
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public function leave($message = false) |
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{ |
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if ($pidFile = @fopen($this->pidFilePath, 'r')) { |
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$pid = fgets($pidFile, 20); |
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fclose($pidFile); |
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if ($pid === posix_getpid()) { |
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unlink($this->pidFilePath); |
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} |
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} else { |
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echo "Error: can't delete own PidFile (" . $this->pidFilePath . ")\n"; |
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} |
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if ($message) { |
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echo $message . "\n"; |
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} |
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} |
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} |
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OpencachingDeutschland /
oc-server3
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