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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1485#note_734806728">lib/tpm2_esys.c</a>:
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="c"></span>
</pre>
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<td class="old_line diff-line-num old" data-linenumber="696" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="new_line diff-line-num old" data-linenumber="698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">install_tpm2_key</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">tpm2_info_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">info</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_privkey_t</span> <span class="n" style="color: #333;">pkey</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="c">                 <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">parent</span><span class="p">,</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">emptyauth</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="c">                 <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">privdata</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">pubdata</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="c"><span class="n" style="color: #333;">GNUTLS_ONCE</span><span class="p">(</span><span class="n" style="color: #333;">tcti_once</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">tpm2_tcti_deinit</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">tcti_ctx</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="c">            <span class="n" style="color: #333;">Tss2_TctiLdr_Finalize</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">tcti_ctx</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="c">    <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">tcti_once_init</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<p dir="auto">Looking more closely at <code>gnutls_global_set_mutex</code>, the reinitialization logic seems to be added to support the implicit initialization of the library (i.e., in that case there is no way to call <code>gnutls_global_set_mutex</code> before "any other gnutls function"). The actual effect of this reinitialization, as far as I understand, is to re-init (dynamic) mutexes created at <code>gnutls_global_init</code>; which are:</p>
<ul dir="auto">
<li><code>_gnutls_file_mutex</code></li>
<li>
<code>_gnutls_pkcs11_mutex</code>
I wonder if those could be turned into a static mutex, then we wouldn't need library reinitialization.</li>
</ul>
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