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When you design a dynamic library, you may have to consider its ongoing maintenance. Otherwise, an app doesn’t launch or a runtime loaded library fails to load.
#Name of apple version of word manual#
Clients get the address of all the symbols they need from runtime loaded libraries by calling the dlsym(3) OS X Developer Tools Manual Page function with the symbol name.Ī client must always be compatible with its dependent libraries. Clients don’t have any undefined external references to symbols in runtime loaded libraries.
Clients open a runtime loaded library when they’re about to use a symbol it exports. The dynamic loader, therefore, doesn’t open these libraries when the client is loaded. Clients do not include runtime loaded libraries in their link line. When a dynamic library is loaded into a running process, its dependent libraries are loaded into the process before control is passed to the routine that opened the library.Ī runtime loaded library is a dynamic library the client opens with the dlopen(3) OS X Developer Tools Manual Page function. For example, when an app is launched, its dependent libraries are loaded as part of the launch process, before the main function is executed. Dependent libraries are loaded into the same process the client is being loaded into as part of its load process. A dependent library, from the client’s point of view, is a dynamic library the client is linked with. The client of a dynamic library can use the library in two ways: as a dependent library or as a runtime-loaded library. Managing Client Compatibility With Dependent Libraries When designed properly, a client created with an early version of a library can use the latest version of the library unchanged and benefit from the improvements it provides. A clear separation between a library’s private and public interfaces gives library developers freedom to make profound changes to the library’s inner workings with minimal impact to its clients. A simple interface allows a library’s users to understand its functionality faster than they could understand a large interface.Įasy to maintain: The library’s developers must be able to make changes to the library that improve its performance and add features. A highly focused library is easier to implement and use than a multi-purpose library.Įasy to use: The library’s interface, the symbols that the clients of the library use to interact with it, should be few and easy to understand. These are the attributes of an optimal dynamic library:įocused: The library should focus on few, highly related goals.
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They should not contain code specific to one app. Therefore, they should contain code that several apps can use. Designing an Optimal Dynamic Libraryĭynamic libraries contain code that can be shared by multiple apps in a user’s computer.
#Name of apple version of word how to#
The focus of this article is to show you how to design libraries in a way that facilitates their improvement through revisions and makes it easy for the libraries’ users to correctly interact with the library. This article addresses the main issues dynamic library developers face when designing and implementing dynamic libraries. Devising a small and effective interface to the library’s functionality goes a long way towards facilitating its adoption in other libraries or apps. This document also uses the word image to refer to dynamic-library clients.) Therefore, before creating a dynamic library, you must define its purpose and its intended use. (A dynamic library client is an app or a library that either is linked with the library or loads the library at runtime. However, when designed improperly, dynamic libraries can degrade the performance of their clients. Next Previous Dynamic Library Design Guidelinesĭynamic libraries, in addition to grouping common functionality, help reduce an app’s launch time.
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