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<a name="Modern-GNU-Objective_002dC-runtime-API"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Traditional-GNU-Objective_002dC-runtime-API.html#Traditional-GNU-Objective_002dC-runtime-API">Traditional GNU Objective-C runtime API</a>,
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Up: <a rel="up" accesskey="u" href="GNU-Objective_002dC-runtime-API.html#GNU-Objective_002dC-runtime-API">GNU Objective-C runtime API</a>
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<h4 class="subsection">8.1.1 Modern GNU Objective-C Runtime API</h4>
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<p>The GNU Objective-C runtime provides an API which is similar to the
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one provided by the “Objective-C 2.0” Apple/NeXT Objective-C
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runtime. The API is documented in the public header files of the GNU
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Objective-C runtime:
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<ul>
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<li><samp><span class="file">objc/objc.h</span></samp>: this is the basic Objective-C header file,
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defining the basic Objective-C types such as <code>id</code>, <code>Class</code>
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and <code>BOOL</code>. You have to include this header to do almost
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anything with Objective-C.
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<li><samp><span class="file">objc/runtime.h</span></samp>: this header declares most of the public runtime
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API functions allowing you to inspect and manipulate the Objective-C
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runtime data structures. These functions are fairly standardized
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across Objective-C runtimes and are almost identical to the Apple/NeXT
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Objective-C runtime ones. It does not declare functions in some
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specialized areas (constructing and forwarding message invocations,
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threading) which are in the other headers below. You have to include
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<samp><span class="file">objc/objc.h</span></samp> and <samp><span class="file">objc/runtime.h</span></samp> to use any of the
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functions, such as <code>class_getName()</code>, declared in
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<samp><span class="file">objc/runtime.h</span></samp>.
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<li><samp><span class="file">objc/message.h</span></samp>: this header declares public functions used to
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construct, deconstruct and forward message invocations. Because
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messaging is done in quite a different way on different runtimes,
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functions in this header are specific to the GNU Objective-C runtime
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implementation.
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<li><samp><span class="file">objc/objc-exception.h</span></samp>: this header declares some public
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functions related to Objective-C exceptions. For example functions in
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this header allow you to throw an Objective-C exception from plain
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C/C++ code.
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<li><samp><span class="file">objc/objc-sync.h</span></samp>: this header declares some public functions
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related to the Objective-C <code>@synchronized()</code> syntax, allowing
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you to emulate an Objective-C <code>@synchronized()</code> block in plain
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C/C++ code.
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<li><samp><span class="file">objc/thr.h</span></samp>: this header declares a public runtime API threading
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layer that is only provided by the GNU Objective-C runtime. It
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declares functions such as <code>objc_mutex_lock()</code>, which provide a
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platform-independent set of threading functions.
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</ul>
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<p>The header files contain detailed documentation for each function in
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the GNU Objective-C runtime API.
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