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<body>
<h1 id="hashpipe-tutorial-2">Hashpipe Tutorial 2</h1>
<p>In the second tutorial we will make a counter that stores its value inside a status buffer which could be viewed using hashpipe_status_monitor.rb script.The init function remains the same aside from 'Hello World!' being changed to 'Init World!'. The run function now has a while loop with the i counter incrementing indefinitely or until terminated by the user.</p>
<div class="sourceCode"><pre class="sourceCode c"><code class="sourceCode c"><span class="ot">#include <stdio.h></span>
<span class="ot">#include <pthread.h></span>
<span class="ot">#include <unistd.h></span>
<span class="co">//You must include the hashpipe header file to access hashpipe definitions</span>
<span class="ot">#include "hashpipe.h"</span>
<span class="dt">static</span> <span class="dt">int</span> init(hashpipe_thread_args_t * args)
{
printf(<span class="st">"Init World!</span><span class="ch">\n</span><span class="st">"</span>);
<span class="kw">return</span> <span class="dv">0</span>;
}
<span class="co">//the main body of the thread is the run function. This time we implemented a</span>
<span class="co">//loop that runs continuously.</span>
<span class="dt">static</span> <span class="dt">void</span> *run(hashpipe_thread_args_t * args)
{
hashpipe_status_t st = args->st;
<span class="dt">int</span> i=<span class="dv">0</span>;
<span class="kw">while</span> (<span class="dv">1</span>){
hashpipe_status_lock_safe(&st);
<span class="co">// Store counter value in status buffer</span>
hputi4(st.buf, <span class="st">"COUNTER"</span>, i);
hashpipe_status_unlock_safe(&st);
i++;
sleep(<span class="dv">1</span>);
}
}</code></pre></div>
<p>The make file remains virtually unchanged aside from file name changes(hpdemo.so to hpdemo2.so etc).</p>
<div class="sourceCode"><pre class="sourceCode makefile"><code class="sourceCode makefile">//This structure is the hashpipe thread descriptor that gets passed to hashpipe
//when the plugin loads.This is the runtime information about the thread e.g.
//run is a pointer to the above run function
static hashpipe_thread_desc_t <span class="dt">hpdemo2_thread </span><span class="ch">=</span><span class="st"> {</span>
name: <span class="st">"hpdemo2_thread"</span>,
skey: <span class="st">"HPD2STAT"</span>,
init: init,
run: run,
ibuf_desc: {NULL},
obuf_desc: {NULL}
};
<span class="ch">-</span><span class="fu">I. -I</span><span class="ch">$(</span><span class="dt">CUDA_DIR</span><span class="ch">)</span><span class="fu">/include -I/usr/local/include </span><span class="ch">\</span>
<span class="fu"> -L. -L/usr/local/lib </span><span class="ch">\</span>
<span class="fu"> -lhashpipe -lrt -lm</span>
<span class="dt">HPDEMO_LIB_TARGET </span><span class="ch">=</span><span class="st"> hpdemo2.so</span>
<span class="dt">HPDEMO_LIB_SOURCES </span><span class="ch">=</span><span class="st"> hpdemo2.c</span>
<span class="dt">HPDEMO_LIB_INCLUDES </span><span class="ch">=</span>
<span class="dv">all:</span><span class="dt"> </span><span class="ch">$(</span><span class="dt">HPDEMO_LIB_TARGET</span><span class="ch">)</span>
<span class="dv">$(HPDEMO_LIB_TARGET):</span><span class="dt"> </span><span class="ch">$(</span><span class="dt">HPDEMO_LIB_SOURCES</span><span class="ch">)</span><span class="dt"> </span><span class="ch">$(</span><span class="dt">HPDEMO_LIB_INCLUDES</span><span class="ch">)</span><span class="dt"> </span>
<span class="ch">$(</span><span class="dt">CC</span><span class="ch">)</span> -o <span class="ch">$(</span><span class="dt">HPDEMO_LIB_TARGET</span><span class="ch">)</span> <span class="ch">$(</span><span class="dt">HPDEMO_LIB_SOURCES</span><span class="ch">)</span> <span class="ch">$(</span><span class="dt">HPDEMO_LIB_CCFLAGS</span><span class="ch">)</span>
<span class="dv">tags:</span>
ctags -R .
<span class="dv">clean:</span><span class="dt"> </span>
rm -f <span class="ch">$(</span><span class="dt">HPDEMO_LIB_TARGET</span><span class="ch">)</span> tags
<span class="dt">prefix</span><span class="ch">=</span><span class="st">/usr/local</span>
<span class="dt">LIBDIR</span><span class="ch">=$(</span><span class="dt">prefix</span><span class="ch">)</span><span class="st">/lib</span>
<span class="dt">BINDIR</span><span class="ch">=$(</span><span class="dt">prefix</span><span class="ch">)</span><span class="st">/bin</span>
<span class="dv">install-lib:</span><span class="dt"> </span><span class="ch">$(</span><span class="dt">HPDEMO_LIB_TARGET</span><span class="ch">)</span>
mkdir -p <span class="st">"</span><span class="ch">$(</span><span class="dt">DESTDIR</span><span class="ch">)$(</span><span class="dt">LIBDIR</span><span class="ch">)</span><span class="st">"</span>
install -p <span class="ch">$^</span> <span class="st">"</span><span class="ch">$(</span><span class="dt">DESTDIR</span><span class="ch">)$(</span><span class="dt">LIBDIR</span><span class="ch">)</span><span class="st">"</span>
<span class="dv">install:</span><span class="dt"> install-lib</span>
<span class="ot">.PHONY:</span><span class="dt"> all tags clean install install-lib</span>
<span class="co"># vi: set ts=8 noet :</span></code></pre></div>
<h1 id="compiling">Compiling</h1>
<p>Type this into command line/terminal to create a shared object This builds the plugin (i.e. the default target defined in the Makefile).</p>
<pre><code>make</code></pre>
<h1 id="installing">Installing</h1>
<p>Installs the plugin in the hashpipe plugin directory.</p>
<pre><code>make install</code></pre>
<h1 id="running">Running</h1>
<p>Run this in the command line/terminal:</p>
<pre><code>hashpipe -p hpdemo2 hpdemo2_thread</code></pre>
<p>In a new terminal window, run this script(it should be a part of the repository you cloned from github):</p>
<pre><code>hashpipe_status_monitor.rb</code></pre>
<p>You should see the status monitor pop up with a counter.</p>
<div class="figure">
<img src="status_monitor.png" alt="" />
</div>
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</html>