a00194.html

uip-1.0,give everyone who want.

<a name="l00156"></a>00156 <span class="comment">/**</span>
<a name="l00157"></a>00157 <span class="comment"> * Block and wait while condition is true.</span>
<a name="l00158"></a>00158 <span class="comment"> *</span>
<a name="l00159"></a>00159 <span class="comment"> * This function blocks and waits while condition is true. See</span>
<a name="l00160"></a>00160 <span class="comment"> * PT_WAIT_UNTIL().</span>
<a name="l00161"></a>00161 <span class="comment"> *</span>
<a name="l00162"></a>00162 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00163"></a>00163 <span class="comment"> * \param cond The condition.</span>
<a name="l00164"></a>00164 <span class="comment"> *</span>
<a name="l00165"></a>00165 <span class="comment"> * \hideinitializer</span>
<a name="l00166"></a>00166 <span class="comment"> */</span>
<a name="l00167"></a><a class="code" href="a00142.html#gad14bbbf092b90aa0a5a4f9169504a8d">00167</a> <span class="preprocessor">#define PT_WAIT_WHILE(pt, cond)  PT_WAIT_UNTIL((pt), !(cond))</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00169"></a>00169 <span class="comment">/** @} */</span>
<a name="l00170"></a>00170 <span class="comment"></span>
<a name="l00171"></a>00171 <span class="comment">/**</span>
<a name="l00172"></a>00172 <span class="comment"> * \name Hierarchical protothreads</span>
<a name="l00173"></a>00173 <span class="comment"> * @{</span>
<a name="l00174"></a>00174 <span class="comment"> */</span>
<a name="l00175"></a>00175 <span class="comment"></span>
<a name="l00176"></a>00176 <span class="comment">/**</span>
<a name="l00177"></a>00177 <span class="comment"> * Block and wait until a child protothread completes.</span>
<a name="l00178"></a>00178 <span class="comment"> *</span>
<a name="l00179"></a>00179 <span class="comment"> * This macro schedules a child protothread. The current protothread</span>
<a name="l00180"></a>00180 <span class="comment"> * will block until the child protothread completes.</span>
<a name="l00181"></a>00181 <span class="comment"> *</span>
<a name="l00182"></a>00182 <span class="comment"> * \note The child protothread must be manually initialized with the</span>
<a name="l00183"></a>00183 <span class="comment"> * PT_INIT() function before this function is used.</span>
<a name="l00184"></a>00184 <span class="comment"> *</span>
<a name="l00185"></a>00185 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00186"></a>00186 <span class="comment"> * \param thread The child protothread with arguments</span>
<a name="l00187"></a>00187 <span class="comment"> *</span>
<a name="l00188"></a>00188 <span class="comment"> * \sa PT_SPAWN()</span>
<a name="l00189"></a>00189 <span class="comment"> *</span>
<a name="l00190"></a>00190 <span class="comment"> * \hideinitializer</span>
<a name="l00191"></a>00191 <span class="comment"> */</span>
<a name="l00192"></a><a class="code" href="a00142.html#g2f8f70c30b9ee08a103fbd69a4365c4c">00192</a> <span class="preprocessor">#define PT_WAIT_THREAD(pt, thread) PT_WAIT_WHILE((pt), PT_SCHEDULE(thread))</span>
<a name="l00193"></a>00193 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00194"></a>00194 <span class="comment">/**</span>
<a name="l00195"></a>00195 <span class="comment"> * Spawn a child protothread and wait until it exits.</span>
<a name="l00196"></a>00196 <span class="comment"> *</span>
<a name="l00197"></a>00197 <span class="comment"> * This macro spawns a child protothread and waits until it exits. The</span>
<a name="l00198"></a>00198 <span class="comment"> * macro can only be used within a protothread.</span>
<a name="l00199"></a>00199 <span class="comment"> *</span>
<a name="l00200"></a>00200 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00201"></a>00201 <span class="comment"> * \param child A pointer to the child protothread's control structure.</span>
<a name="l00202"></a>00202 <span class="comment"> * \param thread The child protothread with arguments</span>
<a name="l00203"></a>00203 <span class="comment"> *</span>
<a name="l00204"></a>00204 <span class="comment"> * \hideinitializer</span>
<a name="l00205"></a>00205 <span class="comment"> */</span>
<a name="l00206"></a><a class="code" href="a00142.html#g9e97a0b4d5cc7764d8e19758f5da53ae">00206</a> <span class="preprocessor">#define PT_SPAWN(pt, child, thread)             \</span>
<a name="l00207"></a>00207 <span class="preprocessor">  do {                                          \</span>
<a name="l00208"></a>00208 <span class="preprocessor">    PT_INIT((child));                           \</span>
<a name="l00209"></a>00209 <span class="preprocessor">    PT_WAIT_THREAD((pt), (thread));             \</span>
<a name="l00210"></a>00210 <span class="preprocessor">  } while(0)</span>
<a name="l00211"></a>00211 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00212"></a>00212 <span class="comment">/** @} */</span>
<a name="l00213"></a>00213 <span class="comment"></span>
<a name="l00214"></a>00214 <span class="comment">/**</span>
<a name="l00215"></a>00215 <span class="comment"> * \name Exiting and restarting</span>
<a name="l00216"></a>00216 <span class="comment"> * @{</span>
<a name="l00217"></a>00217 <span class="comment"> */</span>
<a name="l00218"></a>00218 <span class="comment"></span>
<a name="l00219"></a>00219 <span class="comment">/**</span>
<a name="l00220"></a>00220 <span class="comment"> * Restart the protothread.</span>
<a name="l00221"></a>00221 <span class="comment"> *</span>
<a name="l00222"></a>00222 <span class="comment"> * This macro will block and cause the running protothread to restart</span>
<a name="l00223"></a>00223 <span class="comment"> * its execution at the place of the PT_BEGIN() call.</span>
<a name="l00224"></a>00224 <span class="comment"> *</span>
<a name="l00225"></a>00225 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00226"></a>00226 <span class="comment"> *</span>
<a name="l00227"></a>00227 <span class="comment"> * \hideinitializer</span>
<a name="l00228"></a>00228 <span class="comment"> */</span>
<a name="l00229"></a><a class="code" href="a00142.html#gcd3ac045f0a4ae63412e3b3d8780e8ab">00229</a> <span class="preprocessor">#define PT_RESTART(pt)                          \</span>
<a name="l00230"></a>00230 <span class="preprocessor">  do {                                          \</span>
<a name="l00231"></a>00231 <span class="preprocessor">    PT_INIT(pt);                                \</span>
<a name="l00232"></a>00232 <span class="preprocessor">    return PT_WAITING;                  \</span>
<a name="l00233"></a>00233 <span class="preprocessor">  } while(0)</span>
<a name="l00234"></a>00234 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00235"></a>00235 <span class="comment">/**</span>
<a name="l00236"></a>00236 <span class="comment"> * Exit the protothread.</span>
<a name="l00237"></a>00237 <span class="comment"> *</span>
<a name="l00238"></a>00238 <span class="comment"> * This macro causes the protothread to exit. If the protothread was</span>
<a name="l00239"></a>00239 <span class="comment"> * spawned by another protothread, the parent protothread will become</span>
<a name="l00240"></a>00240 <span class="comment"> * unblocked and can continue to run.</span>
<a name="l00241"></a>00241 <span class="comment"> *</span>
<a name="l00242"></a>00242 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00243"></a>00243 <span class="comment"> *</span>
<a name="l00244"></a>00244 <span class="comment"> * \hideinitializer</span>
<a name="l00245"></a>00245 <span class="comment"> */</span>
<a name="l00246"></a><a class="code" href="a00142.html#g905451249dca72ce0385bf2a9ff178ee">00246</a> <span class="preprocessor">#define PT_EXIT(pt)                             \</span>
<a name="l00247"></a>00247 <span class="preprocessor">  do {                                          \</span>
<a name="l00248"></a>00248 <span class="preprocessor">    PT_INIT(pt);                                \</span>
<a name="l00249"></a>00249 <span class="preprocessor">    return PT_EXITED;                   \</span>
<a name="l00250"></a>00250 <span class="preprocessor">  } while(0)</span>
<a name="l00251"></a>00251 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00252"></a>00252 <span class="comment">/** @} */</span>
<a name="l00253"></a>00253 <span class="comment"></span>
<a name="l00254"></a>00254 <span class="comment">/**</span>
<a name="l00255"></a>00255 <span class="comment"> * \name Calling a protothread</span>
<a name="l00256"></a>00256 <span class="comment"> * @{</span>
<a name="l00257"></a>00257 <span class="comment"> */</span>
<a name="l00258"></a>00258 <span class="comment"></span>
<a name="l00259"></a>00259 <span class="comment">/**</span>
<a name="l00260"></a>00260 <span class="comment"> * Schedule a protothread.</span>
<a name="l00261"></a>00261 <span class="comment"> *</span>
<a name="l00262"></a>00262 <span class="comment"> * This function shedules a protothread. The return value of the</span>
<a name="l00263"></a>00263 <span class="comment"> * function is non-zero if the protothread is running or zero if the</span>
<a name="l00264"></a>00264 <span class="comment"> * protothread has exited.</span>
<a name="l00265"></a>00265 <span class="comment"> *</span>
<a name="l00266"></a>00266 <span class="comment"> * \param f The call to the C function implementing the protothread to</span>
<a name="l00267"></a>00267 <span class="comment"> * be scheduled</span>
<a name="l00268"></a>00268 <span class="comment"> *</span>
<a name="l00269"></a>00269 <span class="comment"> * \hideinitializer</span>
<a name="l00270"></a>00270 <span class="comment"> */</span>
<a name="l00271"></a><a class="code" href="a00142.html#gfa82b860a64b67d25ab3abc21811896f">00271</a> <span class="preprocessor">#define PT_SCHEDULE(f) ((f) == PT_WAITING)</span>
<a name="l00272"></a>00272 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00273"></a>00273 <span class="comment">/** @} */</span>
<a name="l00274"></a>00274 <span class="comment"></span>
<a name="l00275"></a>00275 <span class="comment">/**</span>
<a name="l00276"></a>00276 <span class="comment"> * \name Yielding from a protothread</span>
<a name="l00277"></a>00277 <span class="comment"> * @{</span>
<a name="l00278"></a>00278 <span class="comment"> */</span>
<a name="l00279"></a>00279 <span class="comment"></span>
<a name="l00280"></a>00280 <span class="comment">/**</span>
<a name="l00281"></a>00281 <span class="comment"> * Yield from the current protothread.</span>
<a name="l00282"></a>00282 <span class="comment"> *</span>
<a name="l00283"></a>00283 <span class="comment"> * This function will yield the protothread, thereby allowing other</span>
<a name="l00284"></a>00284 <span class="comment"> * processing to take place in the system.</span>
<a name="l00285"></a>00285 <span class="comment"> *</span>
<a name="l00286"></a>00286 <span class="comment"> * \param pt A pointer to the protothread control structure.</span>
<a name="l00287"></a>00287 <span class="comment"> *</span>
<a name="l00288"></a>00288 <span class="comment"> * \hideinitializer</span>
<a name="l00289"></a>00289 <span class="comment"> */</span>
<a name="l00290"></a><a class="code" href="a00142.html#g155cba6121323726d02c00284428fed6">00290</a> <span class="preprocessor">#define PT_YIELD(pt)                            \</span>
<a name="l00291"></a>00291 <span class="preprocessor">  do {                                          \</span>
<a name="l00292"></a>00292 <span class="preprocessor">    PT_YIELD_FLAG = 0;                          \</span>
<a name="l00293"></a>00293 <span class="preprocessor">    LC_SET((pt)-&gt;lc);                           \</span>
<a name="l00294"></a>00294 <span class="preprocessor">    if(PT_YIELD_FLAG == 0) {                    \</span>
<a name="l00295"></a>00295 <span class="preprocessor">      return PT_YIELDED;                        \</span>
<a name="l00296"></a>00296 <span class="preprocessor">    }                                           \</span>
<a name="l00297"></a>00297 <span class="preprocessor">  } while(0)</span>
<a name="l00298"></a>00298 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00299"></a>00299 <span class="comment">/**</span>
<a name="l00300"></a>00300 <span class="comment"> * \brief      Yield from the protothread until a condition occurs.</span>
<a name="l00301"></a>00301 <span class="comment"> * \param pt   A pointer to the protothread control structure.</span>
<a name="l00302"></a>00302 <span class="comment"> * \param cond The condition.</span>
<a name="l00303"></a>00303 <span class="comment"> *</span>
<a name="l00304"></a>00304 <span class="comment"> *             This function will yield the protothread, until the</span>
<a name="l00305"></a>00305 <span class="comment"> *             specified condition evaluates to true.</span>
<a name="l00306"></a>00306 <span class="comment"> *</span>
<a name="l00307"></a>00307 <span class="comment"> *</span>
<a name="l00308"></a>00308 <span class="comment"> * \hideinitializer</span>
<a name="l00309"></a>00309 <span class="comment"> */</span>
<a name="l00310"></a><a class="code" href="a00142.html#ge3c821e3a388615528efda9d23c7d115">00310</a> <span class="preprocessor">#define PT_YIELD_UNTIL(pt, cond)                \</span>
<a name="l00311"></a>00311 <span class="preprocessor">  do {                                          \</span>
<a name="l00312"></a>00312 <span class="preprocessor">    PT_YIELD_FLAG = 0;                          \</span>
<a name="l00313"></a>00313 <span class="preprocessor">    LC_SET((pt)-&gt;lc);                           \</span>
<a name="l00314"></a>00314 <span class="preprocessor">    if((PT_YIELD_FLAG == 0) || !(cond)) {       \</span>
<a name="l00315"></a>00315 <span class="preprocessor">      return PT_YIELDED;                        \</span>
<a name="l00316"></a>00316 <span class="preprocessor">    }                                           \</span>
<a name="l00317"></a>00317 <span class="preprocessor">  } while(0)</span>
<a name="l00318"></a>00318 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00319"></a>00319 <span class="comment">/** @} */</span>
<a name="l00320"></a>00320 
<a name="l00321"></a>00321 <span class="preprocessor">#endif </span><span class="comment">/* __PT_H__ */</span>
<a name="l00322"></a>00322 <span class="comment"></span>
<a name="l00323"></a>00323 <span class="comment">/** @} */</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Jun 12 10:23:01 2006 for uIP 1.0 by&nbsp;
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