priority interrupt
[hardware] Describes any stimulus compelling enough to yank
one right out of hack mode. Classically used to describe
being dragged away by an SO for immediate sex, but may also
refer to more mundane interruptions such as a fire alarm going
off in the near vicinity. Also called an NMI (non-maskable
interrupt), especially in PC-land.
[Jargon File]
Try this search on OneLook / Google
Nearby terms:
printing discussion « print server « Print Services Facility « priority interrupt » priority inversion » priority queue » priority scheduling
priority inversion
<parallel> The state of a concurrent system where a high
priority task is waiting for a low priority task which is
waiting for a medium priority task. The system may become
unstable and crash under these circumstances.
In an operating system that uses multiple tasks, each task
(or context) may be given a priority. These priorities help
the scheduler decide which task to run next. Consider
tasks, L, M, and H, with priorities Low, Medium, and High. M
is running and H is blocked waiting for some resource that is
held by L. So long as any task with a priority higher than L
is runable, it will prevent task L, and thus task H, from
running.
Priority inversion is generally considered either as a
high-level design failure or an implementation issue to be
taken into account depending on who is talking. Most
operating systems have methods in place to prevent or take
inversion into account. Priority inheritance is one method.
The most public instance of priority inversion is the repeated
'fail-safe' rebooting of the Mars Pathfinder.
base station ('Sagan Memorial Station').
(2003-06-04)
Try this search on OneLook / Google
Nearby terms:
print server « Print Services Facility « priority interrupt « priority inversion » priority queue » priority scheduling » PRISM
priority queue
<programming> A data structure with three operations: insert a
new item, return the highest priority item, and remove the
highest priority item. The obvious way to represent priority
queues is by maintaining a sorted list but this can make the
insert operation very slow. Greater efficiency can be
achieved by using heaps.
(1996-03-12)
Try this search on OneLook / Google
Nearby terms:
Print Services Facility « priority interrupt « priority inversion « priority queue » priority scheduling » PRISM » Prisoner of Bill
priority scheduling
<operating system> Processes scheduling in which the
scheduler selects tasks to run based on their priority as
opposed to, say, a simple round-robin.
Priorities may be static or dynamic. Static priorities are
assigned at the time of creation, while dynamic priorities are
based on the processes' behaviour while in the system. For
example, the scheduler may favour I/O-intensive tasks so
that expensive requests can be issued as early as possible.
A danger of priority scheduling is starvation, in which
processes with lower priorities are not given the opportunity
to run. In order to avoid starvation, in preemptive
scheduling, the priority of a process is gradually reduced
while it is running. Eventually, the priority of the running
process will no longer be the highest, and the next process
will start running. This method is called aging.
Try this search on OneLook / Google
Nearby terms:
priority interrupt « priority inversion « priority queue « priority scheduling » PRISM » Prisoner of Bill » privacy
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
Lord Of The Rings: The Fellowship Of The Ring Activity StudioLord Of The Rings: The Fellowship Of The Ring Activity Studio Join the Fellowship with this ideal film companion to New Line Cinema's extraordinary film, The Lord of the Rings, The Fellowship of the Ring. Beautiful full-color images and creative print projects bring the exciting world of Middle Earth to your PC! Windows 95/98/ME/2000/NT4/XP More ...
Ulead Photo Express My Custom EditionUlead Photo Express My Custom Edition Photo Express My Custom Edition is a full fledged image editor that lets you acquire, enhance and share your photos. Quickly get photos from digital cameras, scanners, CD-ROMs and more. Windows 95/98/ME/NT/2000/XP More ...
Max PayneMax Payne Prepare for a new breed of DEEP ACTION game. Max Payne is a relentless story-driven game about a man on the edge, fighting for his justice while uncovering plot-twists and twisted thugs in the gritty bowels of New York during the century's worst blizzard. Windows 95/98/ME/NT/2000/XP More ...
Samsung USB Presentation Remote with Laser PointerSamsung USB Presentation Remote with Laser Pointer ** Samsung Pocket USB Presentation Remote w/Laser Pointer **This Samsung Little Pocket Presenter is designed to make you a master of presentations! The little pocket presenter integrates a function of a laser pointer and the ability to control the Next, Preview, and Search functions from a distance of up to 30 feet!General Features:- USB receiver- Plug and Play- Works at a distance of up to 30 feet- No software or PC programming requiredTransmitter Features:- Laser Button: On-and-Off control button- Next Button: Next slide control- Previews Button: Slide preview control- Search Button: Slide search controlReceiver Features:- LED Blinking: Connected and waiting for ID- LED Off: ID received and waiting for command- LED Off-On-Off: Every time a command is receivedRegulatory Approvals:- FCC- CE- MICRetail Blister Pack Includes:- USB Receiver- TransmitterNotes:- UPC Code: 6 81747 90967 4 Compatibility/Requirements/Disclosures:** Requirements **- Windows 98SE/Me/2000/XP- Mac (OS 9.2 and above)- Linux (Redhat 9.0 and above)- Available USB port More ...
6-Foot USB 2.0 A to B Cable (Clear/Silver)6-Foot USB 2.0 A to B Cable (Clear/Silver) ** 6-Foot USB A to B Cable **These hard to find (especially at this price) USB 2.0 A to Bcables provide you with a 6-foot reach in a cool, clear casewith silver braiding!General Features:- USB 2.0 A to B cable- 6-foot length- Clear case with silver braiding- Backward compatibleNotes:- Cable only Compatibility/Requirements/Disclosures:** Requirements *** Available USB 2.0 port (A or B port) More ...
256MB DDR RAM PC2100 184-Pin DIMM Major/3rd256MB DDR RAM PC2100 184-Pin DIMM Major/3rd - 256MB DDR (Double Data Rate) RAM- PC-2100 (aka: 266 DDR)- 184-pin- Brand New Compatibility/Requirements/Disclosures:* Motherboard that supports 256MB PC-2100 DDR RAM ** Disclosures *** Picture is for representational purposes only* Country of Origin may be China, Taiwan, Korea, USA, Malaysia More ...
|
