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M
Glossary
master file directory (MFD)
The file catalog of the Executive that contains Exec file definitions that the system or
users can assign and access. Files listed in the MFD are said to be cataloged and are
retained after a run terminates. In an XTC system, there is a single shared MFD for the
system, and each host has its own standard (local) copy of the MFD. See also standard
MFD, shared MFD, or
P
A directory maintained by the Exec to control cataloged files. The MFD contains the
security attributes for cataloged files. Files listed in the MFD are cataloged and retained
after a run terminates. MFDF$$ is the internal file name that refers to the MFD, or
A list of all the files currently cataloged in the computer system. The file may not
currently be in either main or mass storage, but if cataloged, it will be listed in the MFD
until it is deleted.
post mortem dump processor (PMDP)
A system processor that produces a printout (dump) of the main storage a program
occupied when it terminated. Experienced programmers can use these dumps to
determine what processing occurred. This helps isolate errors in a program.
Programmers Advanced Debugging System
A language-independent interactive debugging tool.
Processor common input/output system (PCIOS)
A system that handles data in conventional PCIOS files.
program control table (PCT)
A special table maintained by the Exec for each active run in the system. The PCT
contains control information about a particular run, and about the program currently being
executed in the run (if any). Among other things, the PCT includes a list of the files
currently assigned to the run, or
A table, one per run, created and maintained by the Exec to accummulate data needed to
control and record each run. The PCT is a read-only user bank from 1 to 42 blocks, or
A bank whose data structure is defined, created, and maintained by the operating
system. The PCT contains information about the run, or
An area in main storage containing the information necessary to define the state of the
program. The PCT shows contents of the P-register, the next instruction to be executed,
and the contents of various data registers. With the information in the program control
table, the Exec can stop the program and resume it exactly where it left off.
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