hang

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hang

[haŋ]
(ordnance)
To lock the receiver or bolt of a gun in an open position.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

hang

(1)
To wait for an event that will never occur. "The system is hanging because it can't read from the crashed drive". See wedged, hung.

hang

(2)
To wait for some event to occur; to hang around until something happens. "The program displays a menu and then hangs until you type a character." Compare block.

hang

(3)
To attach a peripheral device, especially in the construction "hang off": "We're going to hang another tape drive off the file server." Implies a device attached with cables, rather than something that is strictly inside the machine's chassis.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

abend

(ABnormal END) Pronounced "ab-end." An abend is an unexpected termination that causes the computer, smartphone or tablet to stop responding. The abend occurs either when the processor is presented with instructions or data it cannot recognize, or a program tries to address memory beyond a defined boundary. Abends are generally the result of erroneous software logic in the application or operating system (see anomaly).

Crash, Freeze, Lock Up and Hang
A "crash" occurs when the computer issues a "fault" and deliberately halts that line of execution. The terms "freeze," "lock up" or "hang" may refer to software that is actually still running but has erroneously wound up in an endless, internal loop that renders the program useless. In practice, the terms "crash," "freeze," "lock up" and "hang" are used synonymously. See infinite loop.

Bad Hardware Can Look Like Bad Software
A serious hardware failure will stop a computer-based device that has no redundant components. For example, a short circuit on the motherboard will halt the operation; however, a failing memory cell can cause an instruction to point to an erroneous location, making it look like a software failure.

It Depends on the OS
If the abend occurs due to a bug in an application and the operating system is not resilient, the computer locks up and has to be rebooted. Modern operating systems attempt to halt only the offending application and allow the remaining applications to continue. As operating systems evolve through the years, they are more tolerant of application bugs. However, operating systems themselves are not 100% foolproof, and bad applications can cause operating systems to crash; a major motivation for running in a virtual mode (see virtualization and virtual machine).

A Miracle It All Works
If you consider what goes on inside a computer, you might wonder why it does not crash more often. An ordinary home computer can easily have 64 billion memory (RAM) cells. Every second, millions of them switch their status between charged and uncharged (1 to 0; 0 to 1). If only one cell fails, it can cause an instruction to be invalid, and an abend can occur. See head crash, GPF, active area and transistor concept.



Abending
The green blocks are machine instructions executed by the CPU one after the other until a branch (jump) instruction breaks the sequence and points to an instruction elsewhere in the program. Abending (crashing, hanging, etc.) occurs when the program erroneously points outside of its address space, typically due to bad logic.
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References in classic literature ?
Then all was bustle in Nottingham Town and crowds filled the streets, for all knew that the famous Will Stutely was to be hanged that day.
I crave no weapon, but let me not be meanly hanged this day."
Now I will make a jest of thee and a sorry jest withal, for I will quarter thee limb from limb, after thou art hanged." Then he spurred his horse forward and said no more to Stutely.
"You will be hanged," replied the other, without hesitation.
"May I be hanged myself," exclaimed Dominicus Pike aloud, on reaching the top of a lonely hill, "if I'll believe old Higginbotham is unhanged till I see him with my own eyes, and hear it from his own mouth!
Comminges had arrested one of the ringleaders and had ordered him to be hanged near the cross of Du Trahoir; but in attempting to execute this command the soldiery were attacked in the market-place with stones and halberds; the delinquent had escaped to the Rue des Lombards and rushed into a house.
The Namibian Police Force's regional crime investigations coordinator, Deputy Commissioner Bonifasius Kanyetu told Nampa the deceased hanged himself with a nylon rope and died instantly.
Chairman Islamic Ideological Council said the convict should be hanged inside the jail.
| British fascist William Joyce, who was hanged for treason in 1946.
'One person was hanged publicly in Lahore during Zia's era.
"He wanted to spend his vacation at home but was captured on Thursday by local Taliban and they hanged him in public," government spokesman Abdul Rehman Mangal said.
After strangulation or throttling persons may be hanged, complete suspension in the absence of platform raises a presumption of murder, as gross injuries will be caused to the neck structure following Strangulation by a ligature and Throttling.