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Month: October 2020

What happens when background scheduling fails

CTS scheduling and dispatch of background tasks has no user interface, and no controls. How can you tell that there’s a problem, and what to do about it?

October 17, 2020 Macs, Technology

Landscapes for All Reasons: Paintings of Aelbert Cuyp 2

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His landscapes gained a rich Claudean light, as he painted ferries on the nearby River Maas, and cattle enjoying the cool water.

October 16, 2020 General, Life, Painting

How does your Mac know when Apple revokes a developer certificate?

Where does macOS store a list of revoked certificates, and how does it keep them up to date? The answer isn’t perhaps what you expect.

October 16, 2020 Macs, Technology

Marianne Stokes: Madonna and Child

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Having painted in Realist, Naturalist and Impressionist styles, from about 1893 she settled with the Pre-Raphaelite, even making egg tempera her main medium.

October 15, 2020 General, Life, Painting

Covid-19 cases continue to rise in England

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At the start of the month, fresh cases in England were doubling every 9 days. They’re now worse that US states like Florida at its worst. Are they improving though?

October 15, 2020 General, Life, Technology

How macOS schedules and dispatches background tasks using CTS 3

What does it take for an app to have ‘activities’ managed for efficiency by CTS? Not a lot – but in return, the management is a black box.

October 15, 2020 Macs, Technology

The Faerie Queene 9: Acrasia’s Bower of Bliss

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Prince Arthur defeats the thousand-strong army of fiends, while Guyon travels on to Acrasia’s garden, where they capture her with a net, and destroy her Bower of Bliss.

October 14, 2020 General, Life, Painting

How macOS schedules and dispatches background tasks using CTS 2

In the first article in this series, I explained how a great many background activities in macOS, including […]

October 14, 2020 Macs, Technology

A History of Rome in Paintings: 10 War with Carthage

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Hannibal crossed the Alps, but the Romans adopted guerrilla tactics before being defeated at Cannae. Then Scipio invaded north Africa and destroyed the Carthaginians at Zama.

October 13, 2020 General, Life, Painting

How macOS schedules and dispatches background tasks using CTS 1

Rather than using cron or launchd, many background services in macOS are now run using Centralized Task Scheduling (CTS). This is how it works.

October 13, 2020 Macs, Technology

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