/** @brief Signal emitted when the action state changes (ready/running/done, etc)
* Signature: `void(CpuAction const& action, simgrid::kernel::resource::Action::State previous)`
*/
static xbt::signal<void(CpuAction const&, Action::State)> on_state_change;
/** @brief Signal emitted when the action state changes (ready/running/done, etc)
* Signature: `void(CpuAction const& action, simgrid::kernel::resource::Action::State previous)`
*/
static xbt::signal<void(CpuAction const&, Action::State)> on_state_change;