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+tags: 645f666f9bcd5a90fca523b33c5a78b7
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+  <h1>Source code for discover.utils.thread_utils</h1><div class="highlight"><pre>
+<span></span><span class="sd">&quot;&quot;&quot; Utility modules for NOVA-Server Threads</span>
+
+<span class="sd">Author:</span>
+<span class="sd">    Dominik Schiller &lt;[email protected]&gt;</span>
+<span class="sd">Date:</span>
+<span class="sd">    13.09.2023</span>
+<span class="sd">&quot;&quot;&quot;</span>
+
+<span class="kn">import</span> <span class="nn">ctypes</span>
+<span class="kn">import</span> <span class="nn">threading</span>
+
+<span class="n">status_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
+<span class="n">ml_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
+<span class="n">jc_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
+<span class="n">job_counter</span> <span class="o">=</span> <span class="mi">0</span>
+
+<span class="n">THREADS</span> <span class="o">=</span> <span class="p">{}</span>
+
+
+<div class="viewcode-block" id="ml_thread_wrapper">
+<a class="viewcode-back" href="../../../api/discover.utils.thread_utils.html#discover.utils.thread_utils.ml_thread_wrapper">[docs]</a>
+<span class="k">def</span> <span class="nf">ml_thread_wrapper</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
+<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
+<span class="sd">    Executing the function in a mutex protected thread for asynchronous execution of long-running ml tasks.</span>
+<span class="sd">    The thread waits with execution unit the status_lock is released. To do any initialization before the thread starts acquire the status lock before creating the thread.</span>
+<span class="sd">    :param func:</span>
+<span class="sd">    :return: The thread</span>
+<span class="sd">    &quot;&quot;&quot;</span>
+
+    <span class="k">def</span> <span class="nf">wrapper</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
+        <span class="k">global</span> <span class="n">job_counter</span>
+
+        <span class="k">def</span> <span class="nf">lock</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
+            <span class="k">try</span><span class="p">:</span>
+                <span class="c1"># Only one ml thread can be active at the same time</span>
+                <span class="n">ml_lock</span><span class="o">.</span><span class="n">acquire</span><span class="p">()</span>
+                <span class="n">func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
+            <span class="k">finally</span><span class="p">:</span>
+                <span class="n">ml_lock</span><span class="o">.</span><span class="n">release</span><span class="p">()</span>
+
+        <span class="n">jc_lock</span><span class="o">.</span><span class="n">acquire</span><span class="p">()</span>
+        <span class="n">job_id</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">job_counter</span><span class="p">)</span>
+        <span class="n">job_counter</span> <span class="o">+=</span> <span class="mi">1</span>
+        <span class="n">jc_lock</span><span class="o">.</span><span class="n">release</span><span class="p">()</span>
+
+        <span class="n">t</span> <span class="o">=</span> <span class="n">BackendThread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">lock</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">job_id</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="o">=</span><span class="n">kwargs</span><span class="p">)</span>
+        <span class="k">return</span> <span class="n">t</span>
+
+    <span class="k">return</span> <span class="n">wrapper</span></div>
+
+
+
+<div class="viewcode-block" id="status_thread_wrapper">
+<a class="viewcode-back" href="../../../api/discover.utils.thread_utils.html#discover.utils.thread_utils.status_thread_wrapper">[docs]</a>
+<span class="k">def</span> <span class="nf">status_thread_wrapper</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
+    <span class="k">def</span> <span class="nf">wrapper</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
+        <span class="k">try</span><span class="p">:</span>
+            <span class="n">status_lock</span><span class="o">.</span><span class="n">acquire</span><span class="p">()</span>
+            <span class="k">return</span> <span class="n">func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
+        <span class="k">finally</span><span class="p">:</span>
+            <span class="n">status_lock</span><span class="o">.</span><span class="n">release</span><span class="p">()</span>
+
+    <span class="k">return</span> <span class="n">wrapper</span></div>
+
+
+
+<div class="viewcode-block" id="BackendThread">
+<a class="viewcode-back" href="../../../api/discover.utils.thread_utils.html#discover.utils.thread_utils.BackendThread">[docs]</a>
+<span class="k">class</span> <span class="nc">BackendThread</span><span class="p">(</span><span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">):</span>
+    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">target</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">):</span>
+        <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span>
+            <span class="bp">self</span><span class="p">,</span> <span class="n">target</span><span class="o">=</span><span class="n">target</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="o">=</span><span class="n">kwargs</span>
+        <span class="p">)</span>
+
+<div class="viewcode-block" id="BackendThread.get_id">
+<a class="viewcode-back" href="../../../api/discover.utils.thread_utils.html#discover.utils.thread_utils.BackendThread.get_id">[docs]</a>
+    <span class="k">def</span> <span class="nf">get_id</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+        <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s2">&quot;_thread_id&quot;</span><span class="p">):</span>
+            <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_thread_id</span>
+        <span class="k">for</span> <span class="nb">id</span><span class="p">,</span> <span class="n">thread</span> <span class="ow">in</span> <span class="n">threading</span><span class="o">.</span><span class="n">_active</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
+            <span class="k">if</span> <span class="n">thread</span> <span class="ow">is</span> <span class="bp">self</span><span class="p">:</span>
+                <span class="k">return</span> <span class="nb">id</span></div>
+
+
+<div class="viewcode-block" id="BackendThread.raise_exception">
+<a class="viewcode-back" href="../../../api/discover.utils.thread_utils.html#discover.utils.thread_utils.BackendThread.raise_exception">[docs]</a>
+    <span class="k">def</span> <span class="nf">raise_exception</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+        <span class="n">thread_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_id</span><span class="p">()</span>
+        <span class="n">res</span> <span class="o">=</span> <span class="n">ctypes</span><span class="o">.</span><span class="n">pythonapi</span><span class="o">.</span><span class="n">PyThreadState_SetAsyncExc</span><span class="p">(</span>
+            <span class="n">thread_id</span><span class="p">,</span> <span class="n">ctypes</span><span class="o">.</span><span class="n">py_object</span><span class="p">(</span><span class="ne">SystemExit</span><span class="p">)</span>
+        <span class="p">)</span>
+        <span class="k">if</span> <span class="n">res</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span>
+            <span class="n">ctypes</span><span class="o">.</span><span class="n">pythonapi</span><span class="o">.</span><span class="n">PyThreadState_SetAsyncExc</span><span class="p">(</span><span class="n">thread_id</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span></div>
+</div>
+
+</pre></div>
+
+           </div>
+          </div>
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+
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