Fiber::Scheduler#fiber_interrupt

VALUE rb_fiber_scheduler_fiber_interrupt(VALUE scheduler, VALUE target, VALUE exception)
{
    VALUE arguments[] = {
        target, exception
    };

    VALUE result;
    enum ruby_tag_type state;

    // We must prevent interrupts while invoking the fiber_interrupt method, because otherwise fibers can be left permanently blocked if an interrupt occurs during the execution of user code. See also `rb_fiber_scheduler_unblock`.
    rb_execution_context_t * volatile ec = GET_EC();
    volatile int saved_interrupt_mask = ec->interrupt_mask;
    ec->interrupt_mask |= PENDING_INTERRUPT_MASK;

    rb_control_frame_t *volatile cfp = ec->cfp;
    EC_PUSH_TAG(ec);
    if ((state = EC_EXEC_TAG()) == TAG_NONE) {
        result = rb_funcallv(scheduler, id_fiber_interrupt, 2, arguments);
    }
    else {
        rb_vm_rewind_cfp(ec, cfp);
    }
    EC_POP_TAG();

    ec->interrupt_mask = saved_interrupt_mask;

    if (state) {
        EC_JUMP_TAG(ec, state);
    }

    RUBY_VM_CHECK_INTS(ec);

    return result;
}