The corosync cluster engine is a group communication system with additional features for implementing high availability within applications. the project provides four c application programming interface features:

* a closed process group communication model with virtual synchrony
guarantees for creating replicated state machines.
* a simple availability manager that restarts the application process
when it has failed.
* a configuration and statistics in-memory database that provide the
ability to set, retrieve, and receive change notifications of
information.
* a quorum system that notifies applications when quorum is achieved
or lost.
this package contains the headers and other necessary files to build applications or libraries that use the closed process group library.