INtime® 3.1 Software - tenAsys

Glossary
memory area
memory pool
message port
multiprogramming
multithreading
object
object directory
OSEM
PIC
priority-based
scheduling
priority inversion
process
region
Provides memory for threads to use for many purposes, including communicating
and storing data.
An amount of memory, with a specified minimum and maximum, allocated to a
process. The basis of INtime software’s memory management. The initial memory
pool is all the memory available to the application (that is, free space memory). It is
managed by the OS and allocated to the application on request.
An RT kernel object type managed by the kernel. Used to provide an access point for
an INtime application thread to communicate with an INtime service.
Ability of an operating system to simultaneously run several unrelated applications
on a single system. Allows more than one application to run at a time.
Ability of an operating system to run multiple threads at virtually the same time.
When the operating system stops executing one thread, it resumes/starts executing
another thread. This transition from one thread to another is called a thread switch.
An instance of a data structure that can be accessed only through a set of functions
provided by a type manager.
A storage area within an INtime process where objects can be cataloged, i.e. have a
name associated with the objects so that other theads may refer to/access the
cataloged object by name.
(OS Encapsulaton Mechanism) Manages the simultaneous operation and integrity of
the Windows kernel and the RT kernel. Used only with INtime nodes.
(Programmable Interrupt Controller) An integrated circuit that can resolve
simultaneous interrupt requests and negotiate a sequence of CPU interrupt requests
based on the priorities of the requesting device controllers.
Abiltiy of an operating system to assign execution order importance values (priority)
to each thread in the system. In an INtime system, the scheduling policy enforced by
the INtime kernel is that the highest priority ready thread is/will immediately become
the running thread. Thus, when thread A is running, if thread B becomes ready
through some system event, and thread B is higher priority than thread A, then the
INtime kernel will immediately preempt thread A, and make thread B the running
thread.
A situation in which a high-priority thread is effectively prevented from running by
a lower-priority thread. Proper use of the RT kernel’s region objects eliminates this
problem.
An RT kernel object type. Processes have memory pools and contain/own execution
threads and other objects.
An RT kernel object type managed by the kernel. Regions are binary semaphores with
special suspension, deletion, and priority-adjustment features. You can use regions to
provide mutual exclusion for resources or data.
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