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| author | 2015-06-29 20:16:15 +0000 | |
|---|---|---|
| committer | 2015-06-29 20:16:15 +0000 | |
| commit | 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch) | |
| tree | 8c64d6e8be006486d975a651505fbbde61365cd6 /src/carboxyl/transaction.rs.html | |
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diff --git a/src/carboxyl/transaction.rs.html b/src/carboxyl/transaction.rs.html new file mode 100644 index 0000000..e9cc7b6 --- /dev/null +++ b/src/carboxyl/transaction.rs.html @@ -0,0 +1,459 @@ +<!DOCTYPE html> +<html lang="en"> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <meta name="generator" content="rustdoc"> + <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/carboxyl-0.1.1/src/transaction.rs`."> + <meta name="keywords" content="rust, rustlang, rust-lang"> + + <title>transaction.rs.html -- source</title> + + <link rel="stylesheet" type="text/css" href="../../main.css"> + + + +</head> +<body class="rustdoc"> + <!--[if lte IE 8]> + <div class="warning"> + This old browser is unsupported and will most likely display funky + things. + </div> + <![endif]--> + + + + <section class="sidebar"> + + + </section> + + <nav class="sub"> + <form class="search-form js-only"> + <div class="search-container"> + <input class="search-input" name="search" + autocomplete="off" + placeholder="Click or press 'S' to search, '?' for more options..." + type="search"> + </div> + </form> + </nav> + + <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span> +<span id="2"> 2</span> +<span id="3"> 3</span> +<span id="4"> 4</span> +<span id="5"> 5</span> +<span id="6"> 6</span> +<span id="7"> 7</span> +<span id="8"> 8</span> +<span id="9"> 9</span> +<span id="10"> 10</span> +<span id="11"> 11</span> +<span id="12"> 12</span> +<span id="13"> 13</span> +<span id="14"> 14</span> +<span id="15"> 15</span> +<span id="16"> 16</span> +<span id="17"> 17</span> +<span id="18"> 18</span> +<span id="19"> 19</span> +<span id="20"> 20</span> +<span id="21"> 21</span> +<span id="22"> 22</span> +<span id="23"> 23</span> +<span id="24"> 24</span> +<span id="25"> 25</span> +<span id="26"> 26</span> +<span id="27"> 27</span> 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id="141">141</span> +<span id="142">142</span> +<span id="143">143</span> +<span id="144">144</span> +<span id="145">145</span> +<span id="146">146</span> +<span id="147">147</span> +<span id="148">148</span> +<span id="149">149</span> +<span id="150">150</span> +<span id="151">151</span> +<span id="152">152</span> +<span id="153">153</span> +<span id="154">154</span> +<span id="155">155</span> +<span id="156">156</span> +<span id="157">157</span> +<span id="158">158</span> +<span id="159">159</span> +<span id="160">160</span> +<span id="161">161</span> +<span id="162">162</span> +<span id="163">163</span> +<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> +<span id="174">174</span> +<span id="175">175</span> +<span id="176">176</span> +<span id="177">177</span> +<span id="178">178</span> +<span id="179">179</span> +<span id="180">180</span> +<span id="181">181</span> +</pre><pre class='rust '> +<span class='doccomment'>//! A trivial global lock transaction system.</span> +<span class='doccomment'>//!</span> +<span class='doccomment'>//! At the moment, this is really just a global static mutex, that needs to be</span> +<span class='doccomment'>//! locked, to ensure the atomicity of a transaction.</span> + +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>Mutex</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cell</span>::<span class='ident'>RefCell</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>boxed</span>::<span class='ident'>FnBox</span>; + + +<span class='doccomment'>/// The global transaction lock.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// TODO: revert this to use a static mutex, as soon as that is stabilized in</span> +<span class='doccomment'>/// the standard library.</span> +<span class='macro'>lazy_static</span><span class='macro'>!</span> { + <span class='kw'>static</span> <span class='kw-2'>ref</span> <span class='ident'>TRANSACTION_MUTEX</span>: <span class='ident'>Mutex</span><span class='op'><</span>()<span class='op'>></span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(()); +} + +<span class='doccomment'>/// Registry for callbacks to be executed at the end of a transaction.</span> +<span class='macro'>thread_local</span><span class='macro'>!</span>( + <span class='kw'>static</span> <span class='ident'>CURRENT_TRANSACTION</span>: <span class='ident'>RefCell</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Transaction</span><span class='op'>>></span> <span class='op'>=</span> + <span class='ident'>RefCell</span>::<span class='ident'>new</span>(<span class='prelude-val'>None</span>) +); + + +<span class='doccomment'>/// A callback.</span> +<span class='kw'>type</span> <span class='ident'>Callback</span> <span class='op'>=</span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>FnBox</span>() <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>; + + +<span class='doccomment'>/// A transaction.</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Transaction</span> { + <span class='ident'>intermediate</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Callback</span><span class='op'>></span>, + <span class='ident'>finalizers</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Callback</span><span class='op'>></span>, +} + +<span class='kw'>impl</span> <span class='ident'>Transaction</span> { + <span class='doccomment'>/// Create a new transaction</span> + <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>Transaction</span> { + <span class='ident'>Transaction</span> { + <span class='ident'>intermediate</span>: <span class='macro'>vec</span><span class='macro'>!</span>[], + <span class='ident'>finalizers</span>: <span class='macro'>vec</span><span class='macro'>!</span>[], + } + } + + <span class='doccomment'>/// Add a callback that will be called, when the transaction is done</span> + <span class='doccomment'>/// except for finalizers.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>later</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>) { + <span class='self'>self</span>.<span class='ident'>intermediate</span>.<span class='ident'>push</span>(<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>callback</span>)); + } + + <span class='doccomment'>/// Add a finalizing callback. This should not have far reaching</span> + <span class='doccomment'>/// side-effects, and in particular not commit by itself. Typical operations</span> + <span class='doccomment'>/// for a finalizer are executing queued state updates.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>end</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>) { + <span class='self'>self</span>.<span class='ident'>finalizers</span>.<span class='ident'>push</span>(<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>callback</span>)); + } + + <span class='doccomment'>/// Advance transactions by moving out intermediate stage callbacks.</span> + <span class='kw'>fn</span> <span class='ident'>advance</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Callback</span><span class='op'>></span> { + <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>; + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>intermediate</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[]; + <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>intermediate</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>intermediate</span>); + <span class='ident'>intermediate</span> + } + + <span class='doccomment'>/// Finalize the transaction</span> + <span class='kw'>fn</span> <span class='ident'>finalize</span>(<span class='self'>self</span>) { + <span class='kw'>for</span> <span class='ident'>finalizer</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>finalizers</span> { + <span class='ident'>finalizer</span>.<span class='ident'>call_box</span>(()); + } + } +} + + +<span class='doccomment'>/// Commit a transaction.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// If the thread is not running any transactions currently, the global lock is</span> +<span class='doccomment'>/// acquired. Otherwise a new transaction begins, since given the interface of</span> +<span class='doccomment'>/// this module it is safely assumed that the lock is already held.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>commit</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>-></span> <span class='ident'>A</span><span class='op'>></span>(<span class='ident'>body</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>A</span> { + <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>; + <span class='comment'>// Begin a new transaction</span> + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>prev</span> <span class='op'>=</span> <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>prev</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>Transaction</span>::<span class='ident'>new</span>()); + <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>prev</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>current</span>.<span class='ident'>borrow_mut</span>()); + <span class='ident'>prev</span> + }); + <span class='comment'>// Acquire global lock if necessary</span> + <span class='kw'>let</span> <span class='ident'>_lock</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>prev</span> { + <span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>TRANSACTION_MUTEX</span>.<span class='ident'>lock</span>().<span class='ident'>ok</span>() + .<span class='ident'>expect</span>(<span class='string'>"global transaction mutex poisoned"</span>) + ), + <span class='prelude-val'>Some</span>(_) <span class='op'>=></span> <span class='prelude-val'>None</span>, + }; + <span class='comment'>// Perform the main body of the transaction</span> + <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>body</span>(); + <span class='comment'>// Advance the transaction as long as necessary</span> + <span class='kw'>loop</span> { + <span class='kw'>let</span> <span class='ident'>callbacks</span> <span class='op'>=</span> <span class='ident'>with_current</span>(<span class='ident'>Transaction</span>::<span class='ident'>advance</span>); + <span class='kw'>if</span> <span class='ident'>callbacks</span>.<span class='ident'>is_empty</span>() { <span class='kw'>break</span> } + <span class='kw'>for</span> <span class='ident'>callback</span> <span class='kw'>in</span> <span class='ident'>callbacks</span> { + <span class='ident'>callback</span>.<span class='ident'>call_box</span>(()); + } + } + <span class='comment'>// Call all finalizers and drop the transaction</span> + <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span> + <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>prev</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>current</span>.<span class='ident'>borrow_mut</span>()) + ); + <span class='ident'>prev</span>.<span class='ident'>unwrap</span>().<span class='ident'>finalize</span>(); + <span class='comment'>// Return</span> + <span class='ident'>result</span> +} + + +<span class='doccomment'>/// Register a callback during a transaction.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_current</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Transaction</span>) <span class='op'>-></span> <span class='ident'>A</span><span class='op'>></span>(<span class='ident'>action</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>A</span> { + <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span> + <span class='kw'>match</span> <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>*</span><span class='ident'>current</span>.<span class='ident'>borrow_mut</span>() { + <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>trans</span>) <span class='op'>=></span> <span class='ident'>action</span>(<span class='ident'>trans</span>), + _ <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"there is no active transaction to register a callback"</span>), + } + ) +} + +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>later</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>(<span class='ident'>action</span>: <span class='ident'>F</span>) { + <span class='ident'>with_current</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>later</span>(<span class='ident'>action</span>)) +} + +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>end</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>(<span class='ident'>action</span>: <span class='ident'>F</span>) { + <span class='ident'>with_current</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>end</span>(<span class='ident'>action</span>)) +} + + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>mod</span> <span class='ident'>test</span> { + <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>; + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>commit_single</span>() { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='number'>3</span>; + <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>v</span> <span class='op'>+=</span> <span class='number'>5</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='number'>8</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>commit_nested</span>() { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='number'>3</span>; + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>v</span> <span class='op'>*=</span> <span class='number'>2</span>); + <span class='ident'>v</span> <span class='op'>+=</span> <span class='number'>4</span>; + }); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='number'>10</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>commits_parallel</span>() { + <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{<span class='ident'>Arc</span>, <span class='ident'>Mutex</span>}; + <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>; + + <span class='comment'>// Set up a ref-counted value</span> + <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='number'>3</span>)); + <span class='comment'>// Spawn a couple of scoped threads performing atomic operations on it</span> + <span class='kw'>let</span> <span class='ident'>guards</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>3</span>) + .<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> { + <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>clone</span>(); + <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> { + <span class='comment'>// Acquire locks independently, s.t. commit atomicity does</span> + <span class='comment'>// not rely on the local locks here</span> + <span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>() <span class='op'>*=</span> <span class='number'>2</span>; + <span class='comment'>// …and sleep for a bit</span> + <span class='ident'>thread</span>::<span class='ident'>sleep_ms</span>(<span class='number'>1</span>); + <span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>() <span class='op'>-=</span> <span class='number'>1</span>; + })) + }) + .<span class='ident'>collect</span>(); + <span class='comment'>// Rejoin with all guards</span> + <span class='kw'>for</span> <span class='ident'>guard</span> <span class='kw'>in</span> <span class='ident'>guards</span> { <span class='ident'>guard</span>.<span class='ident'>join</span>().<span class='ident'>ok</span>().<span class='ident'>expect</span>(<span class='string'>"thread failed"</span>); } + <span class='comment'>// Check result</span> + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&</span><span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='number'>17</span>); + } +} +</pre> +</section> + <section id='search' class="content hidden"></section> + + <section class="footer"></section> + + <div id="help" class="hidden"> + <div class="shortcuts"> + <h1>Keyboard shortcuts</h1> + <dl> + <dt>?</dt> + <dd>Show this help dialog</dd> + <dt>S</dt> + <dd>Focus the search field</dd> + <dt>⇤</dt> + <dd>Move up in search results</dd> + <dt>⇥</dt> + <dd>Move down in search results</dd> + <dt>⏎</dt> + <dd>Go to active search result</dd> + </dl> + </div> + <div class="infos"> + <h1>Search tricks</h1> + <p> + Prefix searches with a type followed by a colon (e.g. + <code>fn:</code>) to restrict the search to a given type. + </p> + <p> + Accepted types are: <code>fn</code>, <code>mod</code>, + <code>struct</code>, <code>enum</code>, + <code>trait</code>, <code>typedef</code> (or + <code>tdef</code>). + </p> + <p> + Search functions by type signature (e.g. + <code>vec -> usize</code>) + </p> + </div> + </div> + + + + <script> + window.rootPath = "../../"; 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