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 ?
It was a little bit of everything,'' said Deputy Dennis Campbell, one of the officers who manned the four-hour checkpoint Tuesday night on Sierra Highway south of Avenue L.
7) To this end, agencies using checkpoints must have a written policy as a directive for their officers to follow.
The checkpoints will delay drivers for about a minute on average, though some will take up to three minutes, said Risinger.
Managers can tailor the roadblock by regulating the number of vehicles that can be stopped at any one time and by limiting the nature and number of questions posed by officers staffing the checkpoints.
The Court in Sitz began by acknowledging that all checkpoints, which by definition involve a "governmental termination of freedom of movement through means intentionally applied,"(7) constitute seizures under the Fourth Amendment and must, therefore, be reasonable.
Smiths Detection, a world leading provider of trace detection and X-ray security screening equipment, today announced it has partnered with the Technical Support Working Group (TSWG) and the Transportation Security Administration (TSA) to design, develop and pilot a unique, movable security checkpoint called the Mobile Screening Checkpoint 40 (MSC 40).
ArQule's innovative Activated Checkpoint Therapy(SM) (ACT) platform is generating products designed to improve the way cancer patients are treated by selectively killing cancer cells and sparing normal cells through restoration and activation of cellular checkpoints that are defective in cancer.
The lab's aim is to identify technology solutions that may dramatically improve checkpoint security while driving down the total cost of ownership for government and airport operators around the world.
ArQule's fundamental approach to treating cancer is to restore the natural biological function of these checkpoints and thereby to kill cancer cells selectively while maintaining the integrity and function of healthy cells, thus avoiding the undifferentiated damage caused, for example, by chemotherapy or radiation.
Checkpoint can leverage this experience to be used in the supply chain, putting the tags on crates and pallets.
Checkpoint Systems is very proud to support Metro's long-term, strategic investment in RFID," said George Off, CEO and Chairman of the Board of Checkpoint Systems, Inc.
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.