6 calls to Process::isRunning()

Process::getPid in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Returns the Pid (process identifier), if applicable.
Process::restart in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Restarts the process.
Process::signal in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Sends a posix signal to the process.
Process::start in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Starts the process and returns after sending the STDIN.
Process::stop in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Stops the process.
Process::wait in drupal/core/vendor/symfony/process/Symfony/Component/Process/Process.php
Waits for the process to terminate.