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Despite the purported advantages of Cocoa, the need to rewrite large amounts of legacy code slowed the transition of Carbon-based applications, famously with Adobe Photoshop ,  which was eventually updated to Cocoa in April This also extended to Apple's own flagship software packages, as iTunes  and Final Cut Pro as well as the features in the QuickTime engine that powers it  remained written in Carbon for many years. In , with the release of OS X Carbon descends from the Toolbox , and as such, is composed of "Managers". Each Manager is a functionally related API, defining sets of data structures and functions to manipulate them.
Managers are often interdependent or layered. Carbon consists of a broad set of functions for managing files, memory, data, the user interface, and other system services. It is implemented as any other API: in macOS, it is spread over several frameworks each a structure built around a shared library , principally Carbon. As an umbrella term encompassing all C-language API procedures accessing Mac-specific functionality, Carbon is not designed as a discrete system. Rather, it opens nearly all the functionality of macOS to developers who do not know the Objective-C language required for the broadly equivalent Cocoa API.
Newer parts of Carbon tend to be much more object-oriented in their conception, most of them based on Core Foundation. The Mac Toolbox's Event Manager originally used a polling model for application design. If there is an event in the queue, the Event Manager passes it back to the application, where it is handled, otherwise it returns immediately.
This behavior is called " busy-waiting ", running the event loop unnecessarily. Busy-waiting reduces the amount of CPU time available for other applications and decreases battery power on laptops. The classic Event Manager dates from the original Mac OS in , when whatever application was running was guaranteed to be the only application running, and where power management was not a concern.
With the advent of MultiFinder and the ability to run more than one application simultaneously came a new Event Manager call, WaitNextEvent , which allows an application to specify a sleep interval. One easy trick for legacy code to adopt a more efficient model without major changes to its source code is simply to set the sleep parameter passed to WaitNextEvent to a very large value—on macOS, this puts the thread to sleep whenever there is nothing to do, and only returns an event when there is one to process.
In this way, the polling model is quickly inverted to become equivalent to the callback model, with the application performing its own event dispatching in the original manner. There are loopholes, though.
For one, the legacy toolbox call ModalDialog , for example, calls the older GetNextEvent function internally, resulting in polling in a tight loop without blocking. Carbon introduces a replacement system, called the Carbon Event Manager. The original Event Manager still exists for compatibility with legacy applications. Carbon Event Manager provides the event loop for the developer based on Core Foundation's CFRunLoop in the current implementation ; the developer sets up event handlers and enters the event loop in the main function, and waits for Carbon Event Manager to dispatch events to the application.addonickculu.gq/4864-common-coupon.php
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In the classic Mac OS, there was no operating system support for application level timers the lower level Time Manager was available, but it executed timer callbacks at interrupt time, during which calls could not be safely made to most Toolbox routines. Timers were usually left to application developers to implement, and this was usually done by counting elapsed time during the idle event - that is, an event that was returned by WaitNextEvent when any other event wasn't available.
In order for such timers to have reasonable resolution, developers could not afford WaitNextEvent to delay too long, and so low "sleep" parameters were usually set. This results in highly inefficient scheduling behavior, since the thread will not sleep for very long, instead repeatedly waking to return these idle events. Apple added timer support to Carbon to address this problem—the system can schedule timers with great efficiency. From Wikipedia, the free encyclopedia. Application programming interface API.
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Retrieved May 8, Helpful answers Drop Down menu. Mac OS X Speciality level out of ten: 0. Mar 31, PM in response to oceanbluesky In response to oceanbluesky Hello, I found this thread due to having a similar issue.
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Perhaps I can help: Mac OS Best of luck, -A. View answer in context. Loading page content. User profile for user: macjack macjack. Reply Helpful Thread reply - more options Link to this Post. Aug 9, AM in response to macjack In response to macjack thank you I've read that thread several times, including sublinked threads, to no avail Aug 9, PM in response to macjack In response to macjack I do not need the 'sudo' command since this Terminal is from the repair partition, right?
Aug 9, PM in response to oceanbluesky In response to oceanbluesky I would use sudo and yes sudo should prompt you for your password, unless you've used it within 15 min.
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I don't know why the -bash: sudo: command not found error How did it become read-only? Aug 9, PM in response to macjack In response to macjack if this helps, after executing the first line, the following is returned: -bash Aug 9, PM in response to macjack In response to macjack apparently it is unnecessary to use sudo since -bash Since version 1. It can be downloaded from App Store. Hi All, i'm tring to install matplotlib svn on a fesh mac osc installation using the system python 2.
Starting with Version 2. For Mac: a. I found out that the ReadMe. This page details issues specific to using ImageJ on macOS systems. I am trying to build one of our plugins for use with the 'all in one' OSX bundle. QGIS 2. Dowloaded the App, tried to run it, Icon bouces, then app closes silently. I found a discussion thread that mentioned running a diagnostic in T SpatiaLite users should consult the Mac OS X-specific instructions section after installing the packages for additional instructions.
You need to use python from brew now, as you installed pycairo for that. Installing Mapnik on Mac OS X build dependencies from source If you are new to compiling source code, or having trouble getting started on a Mac, you may find that building Mapnik on a Linux-based system is a more friendly place to start. To start the conversation again, simply ask a new question. Howdy Mac folks.
GOOD NEWS MAC USERS! UPDATES OF WATCHTOWER LIBRARY CAN BE INSTALLED! | Dong & Gladys Blog
Download Mac software in the Development category - Page Step by step instructions: 1. Here is the answer I got from William Kyngesburye on this: Yes, the whole batch of frameworks is set up for absolue paths. Xcode provide C compiler support. Install Xcode. Conversion and georeferencing of maps for ttMaps Disclaimer. Aim of this project is development of a.