gtpp2m0j | Programming Standards |
The letters I, i, TPF, TPF_, tpf, and tpf_ are reserved for future use by IBM. This standard applies to the following names.
The TPF file system file names reference links to file system objects. These objects include:
You can access any file system object other than tmpfiles by name. The file system file names have as many as 256 characters and contain a hierarchical directory structure that is largely compatible with the Portable Operating System Interface for Computer Environments (POSIX) standards, although this directory structure does not contain executable files.
A TPF collection support data store (DS) is a named set of collections residing in a TPF subsystem. DS names are limited to 8 characters.
Register naming conventions for TPF system programs now require the use of the equated values R0-R15. See the following table.
There are two types of coupling facility (CF) structures:
A logical record cache provides high-speed access to data, which
enables you to develop data sharing programs with improved performance.
You can use a logical record cache for data consistency, which ensures the
validity of the data that is shared and keeps track of data that resides in
permanent storage and the local cache.
IBM reserves all tape names that have a numeric value (0 - 9) as the
second character; for example, A4X or B2B.
The following recoup descriptors are reserved for customer use:
Tape Names
Recoup Descriptors