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‎404.html

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by <code>gdb</code>/<code>lldb</code> at the moment of debugging. For more information regarding
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CPython installation sources, please visit the
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<a href="../installing_cpython/">Installing a free-threaded Python</a> page.</p>
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<h2 id="frequently-seen-errors-and-how-to-fix-them">Frequently seen errors and how to fix them</h2>
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<p>These are error messages that we see come up often when working with code or
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development workflows that have not been updated to accommodate the
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free-threaded build. We also provide suggested fixes. Please send in pull
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requests to <a href="https://github.com/quansight-labs/free-threaded-compatibility">the repository for this
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document</a> if you
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run into any confusing free-threading-specific errors that you suspect apply to
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other libraries and aren't covered here.</p>
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<h3 id="cython-compilation-errors-unknown-type-name-__pyx_vectorcallfunc">Cython compilation errors: <code>unknown type name '__pyx_vectorcallfunc'</code></h3>
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<p>This happens if you try to build a Cython extension for the free-threaded build
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using the current stable release of Cython (3.0.11 at the time of writing). The
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current stable release of Cython does not support the free-threaded build. You
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must either build Cython from the <code>master</code> branch <a href="https://github.com/cython/cython">on
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Github</a> or use the nightly wheel:</p>
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<div class="highlight"><pre><span></span><code>pip<span class="w"> </span>install<span class="w"> </span>-i<span class="w"> </span>https://pypi.anaconda.org/scientific-python-nightly-wheels/simple<span class="w"> </span>cython
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</code></pre></div>
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<p>See <a href="../porting/">the porting guide</a> for more detail about porting Cython code to
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work under free-threading.</p>
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<p>You may wonder why you are able to install a wheel for the current Cython
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release at all. This is because Cython ships a pure-python wheel tagged with
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<code>py2.py3-none-any</code>, which pip will install if it cannot find another wheel that
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is compatible. A future version of Cython will ship a wheel with compiled code
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that supports the free-threaded build.</p>
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<p>The current nightly wheel is a pure-python build, so it works on all
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architectures. The pure-python version of Cython is usually only marginally
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slower than a compiled version, so you should default to installing the wheel in
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CI instead of compiling Cython, which can take up to a few minutes on some CI
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runners.</p>
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<h2 id="compiling-cpython-and-foundational-packages-with-threadsanitizer">Compiling CPython and foundational packages with ThreadSanitizer</h2>
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<p><a href="https://github.com/google/sanitizers/wiki/ThreadSanitizerCppManual">Thread sanitizer</a> (or TSan) helps
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to detect C/C++ data races in concurrent systems. This tool can help to reveal free-threading
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="March 14, 2025 19:08:35">March 14, 2025</span>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="April 18, 2025 15:30:22">April 18, 2025</span>
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