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-/**
-
- \page advanced Advanced FLTK
-
-This chapter explains advanced programming and design topics
-that will help you to get the most out of FLTK.
-
-\section advanced_multithreading Multithreading
-
-FLTK supports multithreaded applications using a locking mechanism
-based on "pthreads". We do not provide a threading interface as part of
-the library.  However a simple example how threads can be implemented
-for all supported platforms can be found in \p test/threads.h
-and \p test/threads.cxx.
-
-To use the locking mechanism, FLTK must be compiled with
-\p --enable-threads set during the \p configure
-process. IDE-based versions of FLTK are automatically compiled with
-locking enabled if possible.
-
-In \p main(), call
-Fl::lock() before
-Fl::run() or
-Fl::wait() to start the runtime
-multithreading support for your program. All callbacks and derived
-functions like \p handle() and \p draw() will now be properly
-locked:
-
-\code
-    int main() {
-      Fl::lock();
-      /* run thread */
-      while (Fl::wait() > 0) {
-        if (Fl::thread_message()) {
-          /* process your data */
-        }
-      }
-    }
-\endcode
-
-You can now start as many threads as you like. From within
-a thread (other than the main thread) FLTK calls must be wrapped
-with calls to Fl::lock() and Fl::unlock():
-
-\code
-    Fl::lock();      // avoid conflicting calls
-    ...              // your code here
-    Fl::unlock();    // allow other threads to access FLTK again
-\endcode
-
-You can send messages from child threads to the main thread
-using Fl::awake(void* message):
-
-\code
-    void *msg;       // "msg" is a pointer to your message
-    Fl::awake(msg);  // send "msg" to main thread
-\endcode
-
-A message can be anything you like. The main thread can retrieve
-the message by calling Fl::thread_message(). See example above.
-
-You can also tell the main thread to call a function for you
-as soon as possible by using
-Fl::awake(Fl_Awake_Handler cb, void* userdata):
-
-\code
-    void do_something(void *userdata) {
-      // running with the main thread
-    }
-
-    // running in another thread
-    void *data;       // "data" is a pointer to your user data
-    Fl::awake(do_something, data);  // call something in main thread
-\endcode
-
-
-FLTK supports multiple platforms, some of which allow only the
-main thread to handle system events and open or close windows.
-The safe thing to do is to adhere to the following rules for
-threads on all operating systems:
-
-
-\li Don't \p show() or \p hide() anything that contains
-    widgets derived from Fl_Window, including dialogs, file
-    choosers, subwindows or those using Fl_Gl_Window.
-
-\li Don't call Fl::wait(), Fl::flush() or any
-    related methods that will handle system messages
-
-\li Don't start or cancel timers
-
-\li Don't change window decorations or titles
-
-\li The \p make_current() method may or may not work well for
-    regular windows, but should always work for a Fl_Gl_Window
-    to allow for high speed rendering on graphics cards with multiple
-    pipelines
-
-See also:
-Fl::awake(void* message),
-Fl::lock(),
-Fl::thread_message(),
-Fl::unlock().
-
-
-\htmlonly
-<hr>
-<table summary="navigation bar" width="100%" border="0">
-<tr>
-  <td width="45%" align="LEFT">
-    <a class="el" href="fluid.html">
-    [Prev]
-    Programming with FLUID
-    </a>
-  </td>
-  <td width="10%" align="CENTER">
-    <a class="el" href="main.html">[Index]</a>
-  </td>
-  <td width="45%" align="RIGHT">
-    <a class="el" href="unicode.html">
-    Unicode and utf-8 Support
-    [Next]
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-  </td>
-</tr>
-</table>
-\endhtmlonly
-
-*/