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<?php |
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namespace Pageon\Pcntl; |
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use Brendt\Stitcher\Event\Event; |
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use Symfony\Component\EventDispatcher\EventDispatcher; |
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class Manager |
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{ |
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/** |
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* @var EventDispatcher |
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*/ |
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private $eventDispatcher; |
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private $children; |
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public function __construct(EventDispatcher $eventDispatcher) { |
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pcntl_signal_dispatch(); |
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$this->eventDispatcher = $eventDispatcher; |
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$this->children = []; |
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pcntl_signal(SIGCHLD, function () { |
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}); |
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} |
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public function async(Process $process) : Process { |
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socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $sockets); |
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list($parentSocket, $childSocket) = $sockets; |
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if (($pid = pcntl_fork()) == 0) { |
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socket_close($childSocket); |
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$output = serialize($process->execute()); |
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socket_write($parentSocket, substr($output, 0, 4095)); |
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socket_close($parentSocket); |
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exit; |
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} |
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socket_close($parentSocket); |
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$process |
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->setStartTime(time()) |
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->setPid($pid) |
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->setSocket($childSocket); |
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return $process; |
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} |
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public function wait(ProcessCollection $processCollection) { |
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$output = []; |
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$processes = $processCollection->toArray(); |
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while (count($processes)) { |
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/** @var Process $process */ |
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foreach ($processes as $key => $process) { |
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$processStatus = pcntl_waitpid($process->getPid(), $status, WNOHANG | WUNTRACED); |
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switch ($processStatus) { |
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case $process->getPid(): |
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$this->handleProcessSuccess($process); |
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unset($processes[$key]); |
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break; |
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case 0: |
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if ($process->getStartTime() + $process->getMaxRunTime() < time() || pcntl_wifstopped($status)) { |
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$this->handleProcessStop($process); |
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unset($processes[$key]); |
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} |
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break; |
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default: |
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throw new \Exception("Could not reliably manage {$process->getPid()}"); |
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} |
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} |
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if (count($processes)) { |
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usleep(100000); |
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} |
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} |
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return $output; |
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} |
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private function handleProcessSuccess(Process $process) { |
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$output[] = unserialize(socket_read($process->getSocket(), 4096)); |
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socket_close($process->getSocket()); |
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$success = $process->getSuccess(); |
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if ($success) { |
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call_user_func_array($success, [$process]); |
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} |
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} |
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private function handleProcessStop(Process $process) { |
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if (!posix_kill($process->getPid(), SIGKILL)) { |
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throw new \Exception('Failed to kill ' . $process->getPid() . ': ' . posix_strerror(posix_get_last_error())); |
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} |
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} |
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} |
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pageon /
stitcher-core
Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArrayis initialized the first time when the foreach loop is entered. You can also see that the value of thebarkey is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.