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<?php |
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namespace SymfonyBundles\Fork; |
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class Process implements ProcessInterface |
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{ |
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/** |
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* @var bool |
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*/ |
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protected $isAllowedFork; |
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/** |
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* @var int |
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*/ |
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protected $processesCount; |
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/** |
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* Constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->setIsAllowedFork(function_exists('pcntl_fork')); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setIsAllowedFork(bool $isAllowedFork): void |
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{ |
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$this->isAllowedFork = $isAllowedFork; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function create(\Closure $closure): ProcessInterface |
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{ |
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for ($i = 0; $i < $this->processesCount; ++$i) { |
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if ($this->fork()) { |
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$closure(); |
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$this->terminate(); |
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} |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function wait(): ProcessInterface |
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{ |
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if ($this->isAllowedFork) { |
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pcntl_wait($status); |
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} |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getPid(): int |
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{ |
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return getmypid(); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @codeCoverageIgnore |
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*/ |
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public function isAlive(int $pid): bool |
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{ |
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$os = strtolower(trim(PHP_OS)); |
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switch ($os) { |
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case 'linux': |
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return empty($this->execute(sprintf('kill -0 %d', $pid))); |
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case 'winnt': |
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case 'windows': |
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$output = $this->execute(sprintf('wmic process where processId=%d get processId', $pid)); |
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return $pid === (int) preg_replace('#[^\d]*#', '', $output); |
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} |
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return false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMemoryUsage(): float |
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{ |
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return round(memory_get_usage(true) / 1024 / 1024, 2); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setCountOfChildProcesses(int $processesCount): ProcessInterface |
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{ |
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if ($processesCount < 1) { |
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$processesCount = $this->getOptimalNumberOfChildProcesses(); |
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} |
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if ($processesCount > static::MAX_PROCESSES_QUANTITY) { |
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$processesCount = static::MAX_PROCESSES_QUANTITY; |
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} |
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if ($this->isAllowedFork) { |
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$this->processesCount = $processesCount; |
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} else { |
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$this->processesCount = 1; |
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} |
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return $this; |
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} |
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/** |
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* @return bool Returns TRUE if this is a child process, else - FALSE |
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*/ |
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protected function fork(): bool |
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{ |
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if ($this->isAllowedFork) { |
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return 0 === pcntl_fork(); |
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} |
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return true; |
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} |
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/** |
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* @codeCoverageIgnore |
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* |
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* @return bool |
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*/ |
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protected function terminate(): bool |
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{ |
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if ($this->isAllowedFork) { |
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return posix_kill(getmypid(), SIGKILL); |
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} |
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return true; |
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} |
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/** |
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* Returns the optimal number of child processes. |
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* |
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* @return int |
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*/ |
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protected function getOptimalNumberOfChildProcesses(): int |
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{ |
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$coreNumber = 1; |
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$detectCommand = [ |
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'linux' => 'cat /proc/cpuinfo | grep processor | wc -l', |
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]; |
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$os = strtolower(trim(PHP_OS)); |
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if (isset($detectCommand[$os])) { |
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$coreNumber = intval($this->execute($detectCommand[$os])); |
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} |
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return $coreNumber; |
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} |
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/** |
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* @param string $command |
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* |
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* @return string |
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*/ |
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protected function execute(string $command): string |
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{ |
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return trim(shell_exec($command)); |
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} |
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} |
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symfony-bundles /
fork
