lockup


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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.

lockup

A building or room for the temporary detention of prisoners by police.
References in periodicals archive ?
The official said at around 7.30am on Tuesday, three other inmates, who were in the same lockup, informed the on-duty guard that the accused was foaming at the mouth and was not breathing.
In fact, Dusaniwsky said there may still be a large number of company insiders waiting for an opportune time to unload their shares following the lockup expiration.
After the Akbari Gate custodial death incident, IGP Arif Nawaz ordered field officers, including CCPO BA Nasir, to ensure the installation of CCTV cameras in police lockups. It is important to note that CCTV cameras were installed where Zeeshan committed suicide.
What else can you expect from Season 2 of "Love After Lockup"?
SHO concerned police station told local journalists that accused Abdul Rasheed Jatoi was in police custody for three days police remand and he fled when he was being interrogated from police lockup. Shaukat Khatiyan, newly posted SSP Shikarpur took notice of breaking police lockup and issued orders for registration a case against night In-charge Head Constable [HC] Akbar Channa and Police Constable ]PC] Naimatullah Hakro under relevant laws and directed the police to find out the location of fleeing accused Abdul Rasheed Jatoi and Daud Mahar.
The report further said that in Swabi Judicial lockup around 130 capacities of prisoners while it has 568 prisoners in recent time and similarly in Nowshera lockup, there are 130 prisoners and it has 330.
The rare death inside a state juvenile lockup came after the agency has recently struggled to overcome sexual and physical assault scandals and staggering staff turnover rates.
Mazlan also said that the Petaling District Health Office would conduct an examination today of the lockup, all other detainees and the staff there.
Shares of Baker Hughes (BHGE) are rising after General Electric (GE) CFO Jamie Miller said earlier while speaking at an industry conference that the company has no plans to alter its majority ownership stake prior to the end of the companies' two-year lockup period in 2019.
the lockup (because that profit only materializes if the bidder loses
At the same time, all funds in the study imposed some form of lockup, allowing them to hold investor assets for a minimum period of time, or investor-level gate, which puts a lid on the amount that can be redeemed at one time.