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tight loop

tight loop in Technology
A loop of code that executes without releasing any resources to other programs or the operating system.
Consider the following pointless BASIC loop that counts upward indefinitely
10 i = i + 1 20 GOTO 10
Run on a single-user system such as MS-DOS this will not cause any problems. Run on a cooperative multitasking operating system such as Windows 3, the system would appear to freeze.
A pre-emptive multitasking operating system such as UNIX or Windows NT would "steal" cycles away from the program and continue to run other programs.
See also busy-wait and multitasking.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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