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wyfcyx 2022-12-23 03:25:26 +00:00
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<span class="item-spacer"></span> fn <a href="#tymethod.writable" class="fnname">writable</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.bool.html">bool</a>;
<span class="item-spacer"></span> fn <a href="#tymethod.read" class="fnname">read</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a>;
<span class="item-spacer"></span> fn <a href="#tymethod.write" class="fnname">write</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a>;
}</code></pre></div><h2 id="required-methods" class="small-section-header">Required Methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><div id="tymethod.readable" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#8">source</a></div><h4 class="code-header">fn <a href="#tymethod.readable" class="fnname">readable</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.bool.html">bool</a></h4></div><div id="tymethod.writable" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#9">source</a></div><h4 class="code-header">fn <a href="#tymethod.writable" class="fnname">writable</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.bool.html">bool</a></h4></div><div id="tymethod.read" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#10">source</a></div><h4 class="code-header">fn <a href="#tymethod.read" class="fnname">read</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a></h4></div><div id="tymethod.write" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#11">source</a></div><h4 class="code-header">fn <a href="#tymethod.write" class="fnname">write</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a></h4></div></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><section id="impl-File-for-OSInode" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/inode.rs.html#108-139">source</a></span><a href="#impl-File-for-OSInode" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="inode/struct.OSInode.html" title="struct os::fs::inode::OSInode">OSInode</a></h3></section><section id="impl-File-for-Pipe" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/pipe.rs.html#108-166">source</a></span><a href="#impl-File-for-Pipe" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="pipe/struct.Pipe.html" title="struct os::fs::pipe::Pipe">Pipe</a></h3></section><section id="impl-File-for-Stdin" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/stdio.rs.html#9-28">source</a></span><a href="#impl-File-for-Stdin" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="stdio/struct.Stdin.html" title="struct os::fs::stdio::Stdin">Stdin</a></h3></section><section id="impl-File-for-Stdout" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/stdio.rs.html#30-46">source</a></span><a href="#impl-File-for-Stdout" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="stdio/struct.Stdout.html" title="struct os::fs::stdio::Stdout">Stdout</a></h3></section></div><script type="text/javascript" src="../../implementors/os/fs/trait.File.js" data-ignore-extern-crates="" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="os" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0-nightly (f6f9d5e73 2022-08-04)" ></div></body></html>
}</code></pre></div><h2 id="required-methods" class="small-section-header">Required Methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><div id="tymethod.readable" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#8">source</a></div><h4 class="code-header">fn <a href="#tymethod.readable" class="fnname">readable</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.bool.html">bool</a></h4></div><div id="tymethod.writable" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#9">source</a></div><h4 class="code-header">fn <a href="#tymethod.writable" class="fnname">writable</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.bool.html">bool</a></h4></div><div id="tymethod.read" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#10">source</a></div><h4 class="code-header">fn <a href="#tymethod.read" class="fnname">read</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a></h4></div><div id="tymethod.write" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/os/fs/mod.rs.html#11">source</a></div><h4 class="code-header">fn <a href="#tymethod.write" class="fnname">write</a>(&amp;self, buf: <a class="struct" href="../mm/page_table/struct.UserBuffer.html" title="struct os::mm::page_table::UserBuffer">UserBuffer</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.usize.html">usize</a></h4></div></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><section id="impl-File-for-OSInode" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/inode.rs.html#108-139">source</a></span><a href="#impl-File-for-OSInode" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="inode/struct.OSInode.html" title="struct os::fs::inode::OSInode">OSInode</a></h3></section><section id="impl-File-for-Pipe" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/pipe.rs.html#108-173">source</a></span><a href="#impl-File-for-Pipe" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="pipe/struct.Pipe.html" title="struct os::fs::pipe::Pipe">Pipe</a></h3></section><section id="impl-File-for-Stdin" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/stdio.rs.html#9-28">source</a></span><a href="#impl-File-for-Stdin" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="stdio/struct.Stdin.html" title="struct os::fs::stdio::Stdin">Stdin</a></h3></section><section id="impl-File-for-Stdout" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/os/fs/stdio.rs.html#30-46">source</a></span><a href="#impl-File-for-Stdout" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.File.html" title="trait os::fs::File">File</a> for <a class="struct" href="stdio/struct.Stdout.html" title="struct os::fs::stdio::Stdout">Stdout</a></h3></section></div><script type="text/javascript" src="../../implementors/os/fs/trait.File.js" data-ignore-extern-crates="" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="os" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.64.0-nightly (f6f9d5e73 2022-08-04)" ></div></body></html>

33
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@ -164,6 +164,13 @@
<span id="164">164</span>
<span id="165">165</span>
<span id="166">166</span>
<span id="167">167</span>
<span id="168">168</span>
<span id="169">169</span>
<span id="170">170</span>
<span id="171">171</span>
<span id="172">172</span>
<span id="173">173</span>
</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident"><span class="kw">super</span>::File</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::mm::UserBuffer</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::sync::UPIntrFreeCell</span>;
@ -280,36 +287,40 @@
}
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="ident">UserBuffer</span>) -&gt; <span class="ident">usize</span> {
<span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">readable</span>());
<span class="kw">let</span> <span class="ident">want_to_read</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf_iter</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">read_size</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">already_read</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ring_buffer</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">exclusive_access</span>();
<span class="kw">let</span> <span class="ident">loop_read</span> <span class="op">=</span> <span class="ident">ring_buffer</span>.<span class="ident">available_read</span>();
<span class="kw">if</span> <span class="ident">loop_read</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">if</span> <span class="ident">ring_buffer</span>.<span class="ident">all_write_ends_closed</span>() {
<span class="kw">return</span> <span class="ident">read_size</span>;
<span class="kw">return</span> <span class="ident">already_read</span>;
}
<span class="ident">drop</span>(<span class="ident">ring_buffer</span>);
<span class="ident">suspend_current_and_run_next</span>();
<span class="kw">continue</span>;
}
<span class="comment">// read at most loop_read bytes</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">loop_read</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">byte_ref</span>) <span class="op">=</span> <span class="ident">buf_iter</span>.<span class="ident">next</span>() {
<span class="kw">unsafe</span> {
<span class="kw-2">*</span><span class="ident">byte_ref</span> <span class="op">=</span> <span class="ident">ring_buffer</span>.<span class="ident">read_byte</span>();
}
<span class="ident">read_size</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="ident">already_read</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">already_read</span> <span class="op">==</span> <span class="ident">want_to_read</span> {
<span class="kw">return</span> <span class="ident">want_to_read</span>;
}
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="ident">read_size</span>;
<span class="kw">return</span> <span class="ident">already_read</span>;
}
}
}
}
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="ident">UserBuffer</span>) -&gt; <span class="ident">usize</span> {
<span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">writable</span>());
<span class="kw">let</span> <span class="ident">want_to_write</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf_iter</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">into_iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">write_size</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">already_write</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ring_buffer</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer</span>.<span class="ident">exclusive_access</span>();
<span class="kw">let</span> <span class="ident">loop_write</span> <span class="op">=</span> <span class="ident">ring_buffer</span>.<span class="ident">available_write</span>();
@ -322,13 +333,15 @@
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">loop_write</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">byte_ref</span>) <span class="op">=</span> <span class="ident">buf_iter</span>.<span class="ident">next</span>() {
<span class="ident">ring_buffer</span>.<span class="ident">write_byte</span>(<span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="ident">byte_ref</span> });
<span class="ident">write_size</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="ident">already_write</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">already_write</span> <span class="op">==</span> <span class="ident">want_to_write</span> {
<span class="kw">return</span> <span class="ident">want_to_write</span>;
}
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="ident">write_size</span>;
<span class="kw">return</span> <span class="ident">already_write</span>;
}
}
}
}
}
</code></pre></div>
}</code></pre></div>
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