slovodefinícia
busy-loop
(foldoc)		tight loop
busy-loop

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.

(1999-05-06)
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