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Which platforms will you be targeting in the future? While the pthread library is the most complex, it does have some important advantages that should weigh heavily in your decision. When choosing a threading package, you must also consider your long-term goals.
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If you are considering whether to port your application using Cocoa or Carbon, this similarity could tip the scales in favor of Carbon. The programming model and terminology of the Carbon threading package is very similar to the native Win32 multithreading API. The Carbon Multiprocessing Services are a procedural, C-based abstraction of the pthread library. Depending on the complexity of your Win32 code, Cocoa’s automatic thread management might be exactly what you are looking for. The NSThread, NSLock, and NSConditionLock classes provide a high-level abstraction of the thread management and synchronization functions in the pthread library. The Cocoa threading package is implemented in Objective-C, and presents an object-oriented interface to the pthread library. Consequently, it is also the most complex and most difficult of the three libraries to use.Ĭocoa threads are part of the Foundation framework. The POSIX thread library offers the most granular level of multithreading support. In fact, both Cocoa threads and the Carbon Multiprocessing Services are implemented using POSIX threads. The C-based POSIX thread library, commonly referred to as ‘pthreads’, is the lowest level of the three. Mac OS X offers application-level multithreading support in three different API packages:
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If you have a Win32-based application that you want to port to Mac OS X and you are primarily a Windows programmer, read this article to get a solid grounding in how Mac OS X handles multithreading. Which API you choose depends on a number of factors, including the level of multithreading support required, your familiarity with object-oriented programming (specifically, OOP with Objective-C), your cross-platform objectives, and of course, your schedule. When writing multithreaded applications, Mac OS X offers a choice of programming interfaces that give you varying degrees of control.