632         $blocking = !(self::ITER_NON_BLOCKING & $flags);
665             if (!$blocking && !isset($out[0]) && !isset($err[0])) {
670             $this->readPipesForOutput(__FUNCTION__, $blocking);
1338      * @param bool $blocking Whether to use a blocking read call
1340     protected function updateStatus(bool $blocking)  argument
1362         $this->readPipes($running && $blocking, '\\' !== \DIRECTORY_SEPARATOR || !$running);
1398      * @param bool   $blocking Whether to use blocking calls or not
1402     private function readPipesForOutput(string $caller, bool $blocking = false)  argument
1410         $this->updateStatus($blocking);
1434      * @param bool $blocking Whether to use blocking calls or not
1437     private function readPipes(bool $blocking, bool $close)  argument
1439         $result = $this->processPipes->readAndWrite($blocking, $close);