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add mutex lock problem when using in while let
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‎_minted-rust/1B8700FBB15D62BD6A053DFD331F13BAD6780C9B890B2179C8FB85A264DC99F3.pygtex‎

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\begin{Verbatim}[commandchars=\\\{\},codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8\relax}]
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\PYG{c+c1}{// \PYGZhy{}\PYGZhy{}snip\PYGZhy{}\PYGZhy{}}
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\PYG{k}{impl}\PYG{+w}{ }\PYG{n}{Worker}\PYG{+w}{ }\PYG{p}{\PYGZob{}}
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\PYG{+w}{ }\PYG{k}{fn} \PYG{n+nf}{new}\PYG{p}{(}\PYG{n}{id}: \PYG{k+kt}{usize}\PYG{p}{,}\PYG{+w}{ }\PYG{n}{receiver}: \PYG{n+nc}{Arc}\PYG{o}{\PYGZlt{}}\PYG{n}{Mutex}\PYG{o}{\PYGZlt{}}\PYG{n}{mpsc}::\PYG{n}{Receiver}\PYG{o}{\PYGZlt{}}\PYG{n}{Job}\PYG{o}{\PYGZgt{}\PYGZgt{}\PYGZgt{}}\PYG{p}{)}\PYG{+w}{ }\PYGZhy{}\PYGZgt{} \PYG{n+nc}{Worker}\PYG{+w}{ }\PYG{p}{\PYGZob{}}
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\PYG{+w}{ }\PYG{k+kd}{let}\PYG{+w}{ }\PYG{n}{thread}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{thread}::\PYG{n}{spawn}\PYG{p}{(}\PYG{k}{move}\PYG{+w}{ }\PYG{o}{||}\PYG{+w}{ }\PYG{p}{\PYGZob{}}
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\PYG{+w}{ }\PYG{k}{while}\PYG{+w}{ }\PYG{k+kd}{let}\PYG{+w}{ }\PYG{n+nb}{Ok}\PYG{p}{(}\PYG{n}{job}\PYG{p}{)}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{receiver}\PYG{p}{.}\PYG{n}{lock}\PYG{p}{().}\PYG{n}{unwrap}\PYG{p}{().}\PYG{n}{recv}\PYG{p}{()}\PYG{+w}{ }\PYG{p}{\PYGZob{}}
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\PYG{+w}{ }\PYG{n+nf+fm}{println!}\PYG{p}{(}\PYG{l+s}{\PYGZdq{}Worker \PYGZob{}id\PYGZcb{} got a job; executing.\PYGZdq{}}\PYG{p}{);}
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\PYG{+w}{ }\PYG{n}{job}\PYG{p}{();}
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\PYG{+w}{ }\PYG{p}{\PYGZcb{}}
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\PYG{+w}{ }\PYG{p}{\PYGZcb{});}
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\PYG{+w}{ }\PYG{n}{Worker}\PYG{+w}{ }\PYG{p}{\PYGZob{}}\PYG{+w}{ }\PYG{n}{id}\PYG{p}{,}\PYG{+w}{ }\PYG{n}{thread}\PYG{+w}{ }\PYG{p}{\PYGZcb{}}
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\PYG{+w}{ }\PYG{p}{\PYGZcb{}}
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\PYG{p}{\PYGZcb{}}
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\end{Verbatim}

‎_minted-rust/696A67E9557FFD9D5BED06FAC16B865EBA5FFB870F3277695E59D5E7C5E4ACD6.pygtex‎

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\begin{Verbatim}[commandchars=\\\{\},codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8\relax}]
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\PYG{n}{MutexGuard}\PYG{o}{\PYGZlt{}}\PYG{n}{T}\PYG{o}{\PYGZgt{}}
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\end{Verbatim}

‎_minted-rust/833A738861C6FFC808FB3F88C6FF51EEBA5FFB870F3277695E59D5E7C5E4ACD6.pygtex‎

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\PYG{n}{Mutex}
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\end{Verbatim}

‎_minted-rust/B670F2677D205A7707A00470B9DFAD98BA5FFB870F3277695E59D5E7C5E4ACD6.pygtex‎

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\begin{Verbatim}[commandchars=\\\{\},codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8\relax}]
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\PYG{n}{LockResult}\PYG{o}{\PYGZlt{}}\PYG{n}{MutexGuard}\PYG{o}{\PYGZlt{}}\PYG{n}{T}\PYG{o}{\PYGZgt{}\PYGZgt{}}
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\end{Verbatim}

‎_minted-rust/C9B1CA13C1118CBA8A322599EC7A30BBBA5FFB870F3277695E59D5E7C5E4ACD6.pygtex‎

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\begin{Verbatim}[commandchars=\\\{\},codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8\relax}]
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\PYG{k+kd}{let}\PYG{+w}{ }\PYG{n}{job}\PYG{+w}{ }\PYG{o}{=}\PYG{+w}{ }\PYG{n}{receiver}\PYG{p}{.}\PYG{n}{lock}\PYG{p}{().}\PYG{n}{unwrap}\PYG{p}{().}\PYG{n}{recv}\PYG{p}{().}\PYG{n}{unwrap}\PYG{p}{()}
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‎code/http13.rs‎

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// --snip--
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impl Worker {
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fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>) -> Worker {
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let thread = thread::spawn(move || {
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while let Ok(job) = receiver.lock().unwrap().recv() {
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println!("Worker {id} got a job; executing.");
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job();
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}
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});
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Worker { id, thread }
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}
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}

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‎rust.pdf‎

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