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message heading - translation to russian
WIKIMEDIA DISAMBIGUATION PAGE
Headings; Heading (disambiguation)
message heading
заголовок сообщения
pilot engine
![A1 and A1X 'Terrier]]s' Wooton and Freshwater running around the train at [[Wootton railway station]], [[Isle of Wight Steam Railway]]](https://commons.wikimedia.org/wiki/Special:FilePath/Southern Railway Class A1X W11 and W8 Wootton.jpg?width=200 "A1 and A1X 'Terrier]]s' Wooton and Freshwater running around the train at [[Wootton railway station]], [[Isle of Wight Steam Railway]]")
![A double headed steam [[excursion train]] in [[Iowa]], September 2006](https://commons.wikimedia.org/wiki/Special:FilePath/SteamAcrossIowaRiver.JPG?width=200 "A double headed steam [[excursion train]] in [[Iowa]], September 2006")
TWO FRONT LOCO
Multi-headed train; Pilot engine; Triple-heading; Double heads; Double-heads; Tripleheading; Triple heading; Pilot Engine; Double-heading; Doubleheading
[pailət'endʒin]
техника
вспомогательный двигатель
железнодорожное дело
снегоочиститель
pilot engine
TWO FRONT LOCO
Multi-headed train; Pilot engine; Triple-heading; Double heads; Double-heads; Tripleheading; Triple heading; Pilot Engine; Double-heading; Doubleheading
pilot engine 1) вспомогательный двигатель 2) railways снегоочиститель
Definition
message passing
One of the two techniques for communicating between parallel
processes (the other being shared memory).
A common use of message passing is for communication in a
parallel computer. A process running on one processor may
send a message to a process running on the same processor or
another. The actual transmission of the message is usually
handled by the run-time support of the language in which the
processes are written, or by the operating system.
Message passing scales better than shared memory, which is
generally used in computers with relatively few processors.
This is because the total communications bandwidth usually
increases with the number of processors.
A message passing system provides primitives for sending and
receiving messages. These primitives may by either
synchronous or asynchronous or both. A synchronous send
will not complete (will not allow the sender to proceed) until
the receiving process has received the message. This allows
the sender to know whether the message was received
successfully or not (like when you speak to someone on the
telephone). An asynchronous send simply queues the message
for transmission without waiting for it to be received (like
posting a letter). A synchronous receive primitive will wait
until there is a message to read whereas an asynchronous
receive will return immediately, either with a message or to
say that no message has arrived.
Messages may be sent to a named process or to a named
mailbox which may be readable by one or many processes.
Transmission involves determining the location of the
recipient and then choosing a route to reach that location.
The message may be transmitted in one go or may be split into
packets which are transmitted independently (e.g. using
wormhole routing) and reassembled at the receiver. The
message passing system must ensure that sufficient memory is
available to buffer the message at its destination and at
intermediate nodes.
Messages may be typed or untyped at the programming language
level. They may have a priority, allowing the receiver to
read the highest priority messages first.
Some message passing computers are the {MIT J-Machine
(http://ai.mit.edu/projects/cva/cva_j_machine.html) }, the
{Illinois Concert Project
(http://www-csag.cs.uiuc.edu/projects/concert.html) } and
transputer-based systems.
Object-oriented programming uses message passing between
objects as a metaphor for procedure call.
(1994-11-11)
Wikipedia
Heading
Heading can refer to:
- Heading (metalworking), a process which incorporates the extruding and upsetting processes
- Headline, text at the top of a newspaper article
- Heading (navigation), the direction a person or vehicle is facing, usually similar to its course
- Aircraft heading, the direction that the aircraft's nose is pointing
- Double-heading, the use of two locomotives at the front of a train
- Subject heading, an integral part of bibliographic control
- Using one's head to move an airborne football or volleyball
- Heading off, (especially with regard to livestock, sports or military action), circling around to prevent livestock or opponents from fleeing. See Heading dog.
- Heading date, a parameter in barley cultivation
- Heading, part of a flag used to attach it to the halyard; see Flag#Hoisting the flag.
