Abstract: Management of datastream construction prior to transmission of the datastream across a channel of a communications system by providing for data blocking while reducing movement or copying of the data improves the performance in a communications system. Multiple header segments received from a higher layer in the communications stack are copied into the datastream header area of a datastream such that the header segments are sequentially stored in the datastream header area. A datastream buffer list having entries referencing the datastream header area is generated. Buffer list entries referencing data segments received from higher layers in the communications stack are also stored in the datastream buffer list. The data segments are not physically moved or copied into the datastream during processing by the communications stack. Rather, a "virtual" datastream is generated by the communications stack for transmission without physically moving or copying the data segment.

Abstract: Management of the processing of relatively large data objects in a communications stack having multiple layers improves the performance in a communications system in preparing relatively large data objects for transmission across a communications network. This reduces or eliminates data movement and copying during segmentation of the relatively large data objects into relatively small data objects, and appendage of headers to the relatively small data object segments during processing in the communications stack. A shared storage manager creates and controls multiple tokens representing multiple images of portions of the relatively large data objects to enable separate scheduling of the multiple images from the same storage unit or buffer to be passed from one layer in a communications stack to the next lower layer in the communications stack. The large data object is segmented into a plurality of relatively small data object segments at one or more of the layers in the communications stack.

Abstract: Transmission control improves the performance in a communications system relating to transferring large data objects between domains or applications. This reduces or eliminates data movement between domains by transferring ownership of the "container" containing the data as opposed to moving the contents of the container from one domain to another domain resulting in copying the large data object. Thus, transmission control provides for control of the transmission of relatively large data objects between domains in a communications system which otherwise only allows efficient transmission of relatively small data objects between domains in a communications system. Tokens are assigned and associated with buffers containing the data to be shared. The token is not an address, but rather an identifier for the buffer which can be transferred from one domain to a second domain without requiring the copying of the data.

Abstract: Effective memory management maximizes the use of main memory in a computing system by avoiding the issuance of operating system primitives which result in overhead and increased processing time. This allows an applications program to change the state of a storage unit such as a buffer or page without requiring the issuance of an operating system primitive to change the physical state of the storage unit. A storage manager is provided for controlling the movement of data between storage units in secondary storage and storage units in main memory. A storage unit state indicator or flag is associated with each storage unit in main memory. In addition, a system state indicator for indicating the physical state of a storage unit is also associated with each storage unit. The system state indicator may be set to one of the states of fixed or pageable while the storage unit state indicator may be set to one of the states of fixed, pageable or don't care.