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                      5: <TITLE>Hints for developers</TITLE>
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                      9: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
                     10:  <b>:</b> <A HREF="mpd64.html"><EM>Internals</EM></A>
                     11:  <b>:</b> <EM>Hints for developers</EM><BR>
                     12: <b>Previous:</b> <A HREF="mpd66.html"><EM>Authentication</EM></A><BR>
                     13: <b>Next:</b> <A HREF="mpd68.html"><EM>References</EM></A>
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                     15: 
                     16: <HR NOSHADE>
                     17:   <H2><A NAME="67"></A>8.3. Hints for developers<A NAME="developer"></A></H2>
                     18: <p>This chapter describes describes some hints for developers.</p>
                     19: <p>
                     20: <dl>
                     21: 
                     22: <dt><b>Source-Code-Style</b><dd><p>There is not so much to say about that, just take a look at the existing 
                     23: source files. <br>
                     24: The Tab-Width is eight with an indent of fore. Please make a space between 
                     25: operators and operands.</p>
                     26: 
                     27: <dt><b>NgFuncGetStats</b><dd><p>NEVER call NgFuncGetStats() with the <em>clear</em> parameter set to true, because 
                     28: there are other functions (echo requests/replies, bandwidth management) 
                     29: wich relies on increasing link-stats. Mpd carries a copy of the netgraph 
                     30: link-stats at link-level, just use these instead. You can call 
                     31: LinkUpdateStats() for updating the internal stats-struct.</p>
                     32: 
                     33: <dt><b>New Authentication-Backends</b><dd><p>Authentication backends must run independently from the rest of Mpd, i.e. 
                     34: you must not access any Mpd resource, because 
                     35: the authentication process is started in its own thread (you have to 
                     36: take care about thread-safety). An <code>AuthData</code> object is passed 
                     37: to your authenticating function which carries a copy of all required
                     38: information. If your backend provides other parameters, like MTU, IP, etc. 
                     39: then put these at the appropriate place into <code>AuthData</code> or 
                     40: <code>Auth</code>.</p>
                     41: <p>If you can't avoid reading from Mpd's internal data, then acquire the 
                     42: Giant Mutex:
                     43: <hr>
                     44: <pre>
                     45: [...]
                     46:   pthread_mutex_lock(&amp;gGiantMutex);
                     47:   [do whatever]
                     48:   pthread_mutex_unlock(&amp;gGiantMutex);
                     49: [...]
                     50: </pre>
                     51: <hr>
                     52: </p>
                     53: 
                     54: </dl>
                     55: </p>
                     56: 
                     57: 
                     58:  <HR NOSHADE>
                     59: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
                     60:  <b>:</b> <A HREF="mpd64.html"><EM>Internals</EM></A>
                     61:  <b>:</b> <EM>Hints for developers</EM><BR>
                     62: <b>Previous:</b> <A HREF="mpd66.html"><EM>Authentication</EM></A><BR>
                     63: <b>Next:</b> <A HREF="mpd68.html"><EM>References</EM></A>
                     64: 
                     65: 
                     66: 
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