checkpoint

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checkpoint

[′chek‚pȯint]
(cell and molecular biology)
A point in the eukaryotic cell cycle at which the cycle may continue if specific conditions are present or will stop if conditions are not right.
(computer science)
That place in a routine at which the entire state of the computer (memory, registers, and so on) is written out on auxiliary storage (tape, disk, cards) from which it may be read back into the computer if the program is to be restarted later.
(navigation)
Geographical location on land or water above which the position of an aircraft in flight may be determined by observation or by electronic means.

checkpoint

i. A predetermined point on the earth's surface used as a means of controlling movement, a registration target for fire adjustment, or a reference for location.
ii. A geographical location on land or water above which the position of an aircraft in flight may be determined by observation or by electronic means.

checkpoint

(programming)
Saving the current state of a program and its data, including intermediate results, to disk or other non-volatile storage, so that if interrupted the program could be restarted at the point at which the last checkpoint occurred.

This facility came into popular use in mainframe operating systemss such as OS/360 in which programs frequently ran for longer than the mean time between system failures. If a program run fails because of some event beyond the program's control (e.g. hardware or operating system failure) then the processor time invested before the checkpoint will not have been wasted.
References in periodicals archive ?
One checkpoint was put into action last weekend, and two more are planned for the summer.
Agencies normally choose locations for checkpoints from areas that statistically reveal a large number of alcohol-related crashes or offenses.
ArQule's ARQ-550RP program is focused on the discovery and clinical development of small molecule drug candidates that target the E2F-1 checkpoint pathway.
About 10 deputies will man the checkpoint, up from a half-dozen at previous checkpoints.
20) To hold that otherwise-lawful DUI or license and registration enforcement checkpoints are unlawful simply because program sponsors had an additional motive to investigate drug trafficking seems an anomaly.
Applying this test to the sobriety checkpoint at issue in Sitz, the Court concluded that no one could question the seriousness of the drunk driving problem on the nation's highways and that checkpoints are a reasonably effective method of addressing the problem.
The Form will be taken by the TSA Transportation Security Officer at the screening checkpoint.
Funded by TSWG, the MSC 40 is a completely self-contained checkpoint solution with multiple integrated detection technologies designed to allow high throughput with various levels of screening, including secondary examination for alarm resolution.
An expected benefit of research to be conducted at the checkpoint lab is significant enhancements to passenger convenience through reduced requirements for divestiture of clothing and other items.
ACT compounds are intended to improve the way cancer patients are treated because they selectively kill cancer cells and spare normal cells by restoring and activating cellular checkpoints that are defective in cancer.
For additional information, visit the Checkpoint Systems web site at www.
George Off, Chairman and Chief Executive Officer of Checkpoint, commented, "The acquisition of ADS is in line with our strategy to grow our CheckNet service bureau business to create increased value for our customers and shareholders.