hang

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Related to hung out to dry: hang around, hang in the balance, hang onto

hang

[haŋ]
(ordnance)
To lock the receiver or bolt of a gun in an open position.

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.

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 become more bug-free themselves and more tolerant of application bugs. However, all operating systems are not 100% foolproof, and bad applications do cause operating systems to crash; a major motivation for virtualizing computers (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.
References in periodicals archive ?
THE EUROPEANS are hungover, the Americans merely hung out to dry - so hang your hat on a non-Ryder Cup player to win the AmEx Championship at The Grove this week.
Outspoken Ospreys coach Lyn Jones has launched a stinging attack on the Welsh Rugby Union's man-management of Gavin Henson, claiming his player was 'hung out to dry' following the Dublin debacle, writes Darren Witcoop.
As though to underline these relationships, Ruegg stretched four black ropes through the rooms of the gallery, and she hung from these ropes "soft" shower stalls (made of a variety of materials, from polystyrene to silicon paper and rubber), as though they had been "hung out to dry." Here she made use of an distancing device familiar from the work of Claes Oldenburg, achieving a highly playful effect through her handling of a variety of materials.