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declare(strict_types=1); // @codeCoverageIgnore
namespace Recoil;
use Recoil\Exception\PanicException;
interface Kernel extends Listener
     * Run the kernel until all strands exit, the kernel is stopped or a kernel
     * panic occurs.
     * A kernel panic occurs when an exception occurs that is not handled by the
     * kernel's exception handler.
     * This method returns immediately if the kernel is already running.
     * @see Kernel::setExceptionHandler()
     * @return null
     * @throws PanicException An unhandled exception has stopped the kernel.
    public function run();
     * Stop the kernel.
     * @return null
    public function stop();
     * Schedule a coroutine for execution on a new strand.
     * Execution begins when the kernel is run; or, if called from within a
     * strand, when that strand cooperates.
     * The coroutine can be a generator object, generator function, or any
     * dispatchable value as documented in {@see Recoil}.
     * @param mixed $coroutine The coroutine to execute.
    public function execute($coroutine): Strand;
     * Set a user-defined exception handler function.
     * The exception handler is invoked when a strand exits with an exception or
     * an internal error occurs in the kernel.
     * The handler function signature is:
     *     function (PanicException $exception)
     * For exceptions caused by a strand, $exception is an instance of
     * {@see StrandException}; otherwise, it is a {@see KernelException}.
     * {@see PanicException::getPrevious()} returns the exception that
     * triggered the call to the exception handler.
     * If the exception handler is unable to handle the exception it can simply
     * re-throw it (or any other exception). This causes the kernel to panic and
     * stop running. This is also the behaviour when no exception handler is set.
     * @param callable|null $fn The exception handler (null = remove).
     * @return null
    public function setExceptionHandler(callable $fn = null);

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