Abstract: A vector entry of a signaling vector is registered to a buffer summary group. The buffer summary group includes one or more summary indicators for one or more buffers assigned to the buffer summary group. A command is processed that sets a vector indicator in the vector entry and based on setting the vector indicator in the vector entry, a summary indicator of the one or more summary indicators is set in the buffer summary group.

Abstract: A buffer summary group of a plurality of buffer summary groups is accessed. The buffer summary group includes one or more summary indicators for one or more buffers assigned to the buffer summary group. A summary indicator of the one or more summary indicators of the buffer summary group is checked to determine whether an event has occurred for at least one buffer of the one or more buffers assigned to the buffer summary group. Based on the checking indicating that the event has occurred, one or more actions are performed.

Abstract: A vector entry of a signaling vector is registered to a buffer summary group. The buffer summary group includes one or more summary indicators for one or more buffers assigned to the buffer summary group. A command is processed that sets a vector indicator in the vector entry and based on setting the vector indicator in the vector entry, a summary indicator of the one or more summary indicators is set in the buffer summary group.

Abstract: Computer system processing complexes which can operate actually or apparently synchronously and in parallel or asynchronously in a network have a coupling facility for sending and receiving commands, responses, and data. The memory for the central processing complexes (which is accessible to each of the processing elements) is provided with storage for messages and data for coupling over a communication channel interface. Each of a plurality of processing elements (CPC) has data objects used to maintain state information for shared data in the coupling facility storage. The coupling facility can receive both message commands and data, sending data and responses to messages, and sending and receiving secondary messages.