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</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>
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