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The spinning pinwheel is a type of progress indicator and a variation of the mouse pointer used in Apple's macOS to indicate that an application is busy. [ 1 ] Officially, the macOS Human Interface Guidelines refer to it as the spinning wait cursor , [ 2 ] but it is also known by other names.
A throbber animation like that seen on many websites when a blocking action is being performed in the background. A throbber, also known as a loading icon, is an animated graphical control element used to show that a computer program is performing an action in the background (such as downloading content, conducting intensive calculations or communicating with an external device).
The result is an indefinite postponement until the thread holding the lock can finish and release it. This is especially true on a single-processor system, where each waiting thread of the same priority is likely to waste its quantum (allocated time where a thread can run) spinning until the thread that holds the lock is finally finished.
While a computer process is performing tasks and cannot accept user input, a wait pointer (an hourglass in Windows before Vista and many other systems, a spinning ring in Windows Vista and later, a watch in classic Mac OS, or a spinning pinwheel in macOS) is displayed when the mouse pointer is in the corresponding window.
The older "hourglass cursor", used in Windows 9x, Windows NT 4.0, Windows 2000 and Windows XP.. From Windows 1.0 to Windows XP, it was represented by an hourglass. Windows Vista introduced a new, animated wait cursor.
3. Ferrules. Everyone knows about pencils. Everyone knows about erasers. But do people know about the ferrule, the metallic band at the top of the pencil that holds the eraser in place?
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The scroll wheel on a mouse has been invented multiple times by different people unaware of the others' work. Other scrolling controls on a mouse, and the use of a wheel for scrolling both precede the combination of wheel and mouse. The earliest known example of the former is the Mighty Mouse prototype developed jointly by NTT, Japan and ETH Zürich, Switzer