130 lines
31 KiB
Plaintext
130 lines
31 KiB
Plaintext
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rust
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òz #rustc 1.93.0 (254b59607 2026-01-19)Á“õ…·fÊvŠ ¦%g- -c48c539199cbc88bÁ ³VOÐêùÿ²?ÑL¼�§Ì± -a7a40eb546f9e2b0Á á\ƒ¦è3$|]åŒ[IÚ tæ -14b12edc9f8cd90bÁ ë&Gf·Ã ¬ëñq:¤»b -bb76018b1173caf6Áà 9m Ù„«ÐÒþá•c‘B; -030c5b0bba47cc8fÁ rustc_std_workspace_coreÁÛ¹þÓ7>H%¸ÚÉ’› -4b81d37a5530864dÁ üÃùs<Uß7VyóHr#QÏ -c66cc7807550ce25Á miniz_oxideÁõFÖˆÚ™ª‹"ÞXzLVª -62cbc7af83058505Á adler2Á—wÉD‘嵯�|6¨%Œ
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+ -2f171dd2394b4b62Á hashbrownÁ,ïcV¼¨ø¢:Ê\'È߈ -9571ba9e0f6c7a90Á rustc_std_workspace_allocÁ%¥Èxµù·¼5Ä3Bœ -aac566ad65903fa4Á
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std_detectÁMmáýZ^9õ Îà§e˜÷e -2edb296e590136d8Á rustc_demangleÁ@¼§VÉNb˜æ¨fHÌ+V3 -53b132e4a2fa6e26Á cfg_ifÁfÝv�.Å"ÒÜuPp¹ˆ¶ -f76b385d7d4d7f3eÁ addr2lineÁÕú-WiúQVÓ¬
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µT§�5 -fe25100bd73e48e4Á gimliÁ¹xLáÇí÷‘o ±Ñ8£Å -265ba9e6e4f70b3fÁ objectÁÔ³ÝzÓÿ¶ò°öM›¼òü` -9ae0d1f8ea52a318Á memchrÁRÎ÷׎™te~QÓ¿ØC\Ò -0bff3c8e8f4e489eÁ –©H�tGNÏ ·ˆ!á -d69228d077d46f36Á try_lockÁ•9xÉÍðÒãÇìî% ÷ -fa7b885c3fa3804dÁ testsÁ,·_ à$¬_ “
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«4<‡ 6 ü û� ¡ 3 8¹ l 7 https://docs.rs/want/0.3.1Á ä ü 5 ü‰D A A Futures channel-like utility to signal when a value is wanted.Á Î Ë üÒM J Futures are supposed to be lazy, and only starting work if `Future::poll`Á ü I F is called. The same is true of `Stream`s, but when using a channel asÁ üêL I a `Stream`, it can be hard to know if the receiver is ready for the nextÁ T· value.Á Â Ë üÆN K Put another way, given a `(tx, rx)` from `futures::sync::mpsc::channel()`,Á ü•O L how can the sender (`tx`) know when the receiver (`rx`) actually wants moreÁ üåI F work to be produced? Just because there is room in the channel bufferÁ ü¯8 5 doesn't mean the work would be used by the receiver.Á è Ë üìM J This is where something like `want` comes in. Added to a channel, you canÁ üºO L make sure that the `tx` only creates the message and sends it when the `rx`Á üŠ2 / has `poll()` for it, and the buffer was empty.Á ½ Ë lÁ
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# ExampleÁ Ï Ë tÓ ```nightlyÁ üâ # //#![feature(async_await)]Á ´ƒ extern crate want;Á š Ë Üž # fn spawn<T>(_t: T) {}Á üº1 . # fn we_still_want_message() -> bool { true }Á üì0 - # fn mpsc_channel() -> (Tx, Rx) { (Tx, Rx) }Á „�
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# struct Tx;Á ü® 0 - # impl Tx { fn send<T>(&mut self, _: T) {} }Á „ß
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# struct Rx;Á üð S P # impl Rx { async fn recv(&mut self) -> Option<Expensive> { Some(Expensive) } }Á Ä
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Ë üÈ
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1 . // Some message that is expensive to produce.Á ¬ú
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struct Expensive;Á � Ë ü” ) & // Some futures-aware MPSC channel...Á ü¾ * ' let (mut tx, mut rx) = mpsc_channel();Á é Ë ôí // And our `want` channel!Á üŒ ' $ let (mut gv, mut tk) = want::new();Á ´ Ë ¸ Ë ä¼ // Our receiving task...Á ´Ù spawn(async move {Á üð > ; // Maybe something comes up that prevents us from everÁ ü¯
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' $ // using the expensive message.Á T×
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//Á üâ
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> ; // Without `want`, the "send" task may have started toÁ ü¡@ = // produce the expensive message even though we wouldn'tÁ ìâ // be able to use it.Á ü€% " if !we_still_want_message() {Á œ¦ return;Á Lº }Á Ä Ë üÈ9 6 // But we can use it! So tell the `want` channel.Á ”‚ tk.want();Á • Ë ü™ match rx.recv().await {Á ü¹4 1 Some(_msg) => println!("got a message"),Á üî% " None => println!("DONE"),Á L” »V <ž });Á ¦ Ë ¼ª // Our sending taskÁ ´Â –S üÙG D // It's expensive to create a new message, so we wait until theÁ ü¡3 0 // receiving end truly *wants* the message.Á üÕ/ , if let Err(_closed) = gv.want().await {Á ü…4 1 // Looks like they will never want it...Á œº V LÎ »V Ø Ë üÜ" // They want it, let's go!Á Üÿ tx.send(Expensive);Á <› ÜX £ Ë ”§ # fn main() {}Á <º ```Á 9:@D“
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