static simgrid::xbt::signal<void(VirtualMachine&)> on_shutdown;
static simgrid::xbt::signal<void(VirtualMachine&)> on_suspend;
static simgrid::xbt::signal<void(VirtualMachine&)> on_resume;
static simgrid::xbt::signal<void(VirtualMachine&)> on_shutdown;
static simgrid::xbt::signal<void(VirtualMachine&)> on_suspend;
static simgrid::xbt::signal<void(VirtualMachine&)> on_resume;