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<?php |
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/** |
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* @license LGPLv3, http://opensource.org/licenses/LGPL-3.0 |
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* @copyright Aimeos (aimeos.org), 2017 |
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* @package MW |
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* @subpackage Process |
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*/ |
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namespace Aimeos\MW\Process; |
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/** |
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* Posix process control for parallel processing classes |
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* |
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* @package MW |
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* @subpackage Process |
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*/ |
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class Pcntl implements Iface |
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{ |
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private $max; |
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private $prio; |
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private $list = []; |
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/** |
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* Initializes the object and sets up the signal handler |
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* |
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* @param integer $max Maximum number of tasks allowed to run in parallel |
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* @param integer $prio Task priority from -20 (high) to 20 (low) |
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* @throws \Aimeos\MW\Process\Exception If setting up the signal handler failed |
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*/ |
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public function __construct( $max = 4, $prio = 19 ) |
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{ |
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$this->max = $max; |
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$this->prio = $prio; |
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$handler = function( $signo ) |
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{ |
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foreach( $this->list as $pid => $entry ) |
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{ |
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posix_kill( $pid, $signo ); |
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pcntl_waitpid( $pid ); |
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} |
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exit( 0 ); |
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}; |
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if( pcntl_signal( SIGTERM, $handler ) === false ) { |
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throw new Exception( 'Unable to install signal handler: ' . pcntl_strerror( pcntl_get_last_error() ) ); |
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} |
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} |
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/** |
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* Checks if processing tasks in parallel is available |
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* |
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* @return boolean True if available, false if not |
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*/ |
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public function isAvailable() |
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{ |
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if( php_sapi_name() === 'cli' && function_exists( 'pcntl_fork' ) === true ) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Starts a new task by executing the given anonymous function |
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* |
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* @param \Closure $fcn Anonymous function to execute |
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* @param array $data List of parameters that is passed to the closure function |
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* @param boolean $restart True if the task should be restarted if it fails (only once) |
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* @return void |
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* @throws \Aimeos\MW\Process\Exception If starting the new task failed |
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*/ |
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public function start( \Closure $fcn, array $data, $restart = false ) |
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{ |
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while( count( $this->list ) >= $this->max ) { |
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$this->waitOne(); |
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} |
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if( ( $pid = pcntl_fork() ) === -1 ) { |
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throw new Exception( 'Unable to fork new process: ' . pcntl_strerror( pcntl_get_last_error() ) ); |
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} |
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if( $pid === 0 ) // child process |
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{ |
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pcntl_setpriority( $this->prio ); |
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try { |
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call_user_func_array( $fcn, $data ); |
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} catch( \Exception $e ) { |
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exit( 1 ); |
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} |
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exit( 0 ); |
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} |
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$this->list[$pid] = [$fcn, $data, $restart]; |
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return $this; |
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} |
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/** |
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* Waits for the running tasks until all have finished |
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* |
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* @return void |
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*/ |
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public function wait() |
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{ |
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while( !empty( $this->list ) ) { |
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$this->waitOne(); |
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} |
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return $this; |
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} |
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/** |
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* Waits for the next running tasks to finish |
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* |
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* @return void |
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* @throws \Aimeos\MW\Process\Exception If an error occurs or the task exited with an error |
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*/ |
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protected function waitOne() |
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{ |
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$status = -1; |
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if( ( $pid = pcntl_wait( $status ) ) === -1 ) { |
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throw new Exception( 'Unable to wait for child process: ' . pcntl_strerror( pcntl_get_last_error() ) ); |
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} |
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list( $fcn, $data, $restart ) = $this->list[$pid]; |
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unset( $this->list[$pid] ); |
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if( $status > 0 ) |
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{ |
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if( $restart === false ) { |
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throw new Exception( sprintf( 'Process (PID "%1$s") failed with status "%2$s"', $pid, $status ) ); |
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} |
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$this->start( $fcn, $data, false ); |
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} |
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} |
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} |
aimeos /
aimeos-core
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This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.