Compile and build tools that based on GN and ninja for distributed middleware components.

The commonlibrary/c_utils repository provides the commonly used C++ utility classes for standard system.

EventHandler provides the basic ability for OpenHarmony thread to thread communication, allowing for the creation of new threads through EventRunner and the throwing of time-consuming operations onto the new thread for execution, thereby achieving reasonable processing of time-consuming tasks without blocking the original thread.

The configuration policy component, namely, customization_config_policy, provides APIs for each service module to obtain the configuration directories at different levels or the configuration file paths.