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| <h4 class="subsection">8.1.1 Modern GNU Objective-C runtime API</h4> |
| |
| <p>The GNU Objective-C runtime provides an API which is similar to the |
| one provided by the “Objective-C 2.0” Apple/NeXT Objective-C |
| runtime. The API is documented in the public header files of the GNU |
| Objective-C runtime: |
| |
| <ul> |
| <li><samp><span class="file">objc/objc.h</span></samp>: this is the basic Objective-C header file, |
| defining the basic Objective-C types such as <code>id</code>, <code>Class</code> |
| and <code>BOOL</code>. You have to include this header to do almost |
| anything with Objective-C. |
| |
| <li><samp><span class="file">objc/runtime.h</span></samp>: this header declares most of the public runtime |
| API functions allowing you to inspect and manipulate the Objective-C |
| runtime data structures. These functions are fairly standardized |
| across Objective-C runtimes and are almost identical to the Apple/NeXT |
| Objective-C runtime ones. It does not declare functions in some |
| specialized areas (constructing and forwarding message invocations, |
| threading) which are in the other headers below. You have to include |
| <samp><span class="file">objc/objc.h</span></samp> and <samp><span class="file">objc/runtime.h</span></samp> to use any of the |
| functions, such as <code>class_getName()</code>, declared in |
| <samp><span class="file">objc/runtime.h</span></samp>. |
| |
| <li><samp><span class="file">objc/message.h</span></samp>: this header declares public functions used to |
| construct, deconstruct and forward message invocations. Because |
| messaging is done in quite a different way on different runtimes, |
| functions in this header are specific to the GNU Objective-C runtime |
| implementation. |
| |
| <li><samp><span class="file">objc/objc-exception.h</span></samp>: this header declares some public |
| functions related to Objective-C exceptions. For example functions in |
| this header allow you to throw an Objective-C exception from plain |
| C/C++ code. |
| |
| <li><samp><span class="file">objc/objc-sync.h</span></samp>: this header declares some public functions |
| related to the Objective-C <code>@synchronized()</code> syntax, allowing |
| you to emulate an Objective-C <code>@synchronized()</code> block in plain |
| C/C++ code. |
| |
| <li><samp><span class="file">objc/thr.h</span></samp>: this header declares a public runtime API threading |
| layer that is only provided by the GNU Objective-C runtime. It |
| declares functions such as <code>objc_mutex_lock()</code>, which provide a |
| platform-independent set of threading functions. |
| |
| </ul> |
| |
| <p>The header files contain detailed documentation for each function in |
| the GNU Objective-C runtime API. |
| |
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