242 lines
92 KiB
Plaintext
242 lines
92 KiB
Plaintext
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rust
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ˆn #rustc 1.96.0 (ac68faa20 2026-05-25)ÁÀ뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á íàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
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std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
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‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á–ù«< fÅþ¦®Ž
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žaa…Ý -54993f73e3057ce2Á RawFdÁ,K ú $> 4= ‚$í—‚ $â— impÁ á â <¼ � ž ú $ô â <ú |ó ¤ï ‚$¶Â‚ $«Â À errorÁ î ‚ × sourceÁ �
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-æ . BUFFERÁ / / - mkÁ 2 - openÁ - from_fifoÁ 5 5 7 - from_pipeÁ 9 9 - from_fdsÁ - acquireÁ - acquire_allow_interruptsÁ - try_acquireÁ - releaseÁ @ -
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string_argÁ - availableÁ - configureÁ D spawn_helperÁ F F USR1_INITÁ F F J L joinÁ M fcntl_checkÁ fd_checkÁ clone_fd_and_set_cloexecÁ Q set_cloexecÁ set_nonblockingÁ cvtÁ sigusr1_handlerÁ W drop_without_releasingÁ
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] new_okÁ ] new_errÁ `æ ` from_env_extÁ b c b ` from_envÁ `¿ `ì h `¡ `± ` configure_makeÁ `
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† NoJobserverÁ ‰
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¸ˆ »× ClientÁ ½Ç ½Ó ½ creation_argÁ ½ is_non_blockingÁ Â× AcquiredÁ Ä byteÁ Æ× HelperÁ ÈŠ Ⱥ Ë× „ Íß Ïƒ Ñ× Ø Ó€ Ó dataÁ Ó disabledÁ ×× HelperStateÁ ÙÜ Ù cvarÁ
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¥Tó ½T ׌Ô* ™ YËd÷* ‚ [÷„…+ † \ü èÔ ü 0 - An implementation of the GNU make jobserver.Á 1ú ü5M J This crate is an implementation, in Rust, of the GNU `make` jobserver forÁ üƒN K CLI tools that are interoperating with make or otherwise require some formÁ üÒJ G of parallelism limiting across process boundaries. This was originallyÁ ü�L I written for usage in Cargo to both (a) work when `cargo` is invoked fromÁ üêM J `make` (using `make`'s jobserver) and (b) work when `cargo` invokes buildÁ ü¸I F scripts, exporting a jobserver implementation for `make` processes toÁ ¬‚ transitively use.Á ˜ú üœJ G The jobserver implementation can be found in [detail online][docs] butÁ üçF C basically boils down to a cross-process semaphore. On Unix this isÁ ü®L I implemented with the `pipe` syscall and read/write ends of a pipe and onÁ üûL I Windows this is implemented literally with IPC semaphores. Starting fromÁ üÈO L GNU `make` version 4.4, named pipe becomes the default way in communicationÁ ü˜M J on Unix. This crate also supports that feature in the sense of inheritingÁ üæ+ ( and forwarding the correct environment.Á ’ú ü–N K The jobserver protocol in `make` also dictates when tokens are acquired toÁ üåN K run child work, and clients using this crate should take care to implementÁ ü´ E B such details to ensure correct interoperation with `make` itself.Á ú ú |þ ## ExamplesÁ Ž
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L I Connect to a jobserver that was set up by `make` or a different process:Á ß
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use jobserver::Client;Á Œ ú ü� 5 2 // See API documentation for why this is `unsafe`Á üÆ 6 3 let client = match unsafe { Client::from_env() } {Á üý Some(client) => client,Á ü� 0 - None => panic!("client not configured"),Á 4Î };Á <Õ ```Á Ý ú üá / , Acquire and release token from a jobserver:Á ‘
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J G let token = client.acquire().unwrap(); // blocks until it is availableÁ üÆ< 9 drop(token); // releases the token when the work is doneÁ <ƒ—� ‹ú ü�H E Create a new jobserver and configure a child process to have access:Á Øú <Ü—� ôä use std::process::Command;Á Ôƒ÷� žú ü¢E B let client = Client::new(4).expect("failed to create jobserver");Á üè' $ let mut cmd = Command::new("make");Á ü� client.configure(&mut cmd);Á <°—� ¸ú t¼ ## CaveatsÁ Ëú üÏH E This crate makes no attempt to release tokens back to a jobserver onÁ ü˜M J abnormal exit of a process. If a process which acquires a token is killedÁ üæO L with ctrl-c or some similar signal then tokens will not be released and theÁ ü¶( % jobserver may be in a corrupt state.Á ßú üãO L Note that this is typically ok as ctrl-c means that an entire build processÁ ü³? < is being torn down, but it's worth being aware of at least!Á óú ´÷ ## Windows caveatsÁ Žú ü’M J There appear to be two implementations of `make` on Windows. On MSYS2 oneÁ üàM J typically comes as `mingw32-make` and the other as `make` itself. I'm notÁ ü®P M personally too familiar with what's going on here, but for jobserver-relatedÁ üÿI F information the `mingw32-make` implementation uses Windows semaphoresÁ üÉO L whereas the `make` program does not. The `make` program appears to use fileÁ ü™J G descriptors and I'm not really sure how it works, so this crate is notÁ üäF C compatible with `make` on Windows. It is, however, compatible withÁ œ« `mingw32-make`.Á ¿ú üÃK H [docs]: https://make.mad-scientist.net/papers/jobserver-implementation/Á https://docs.rs/jobserver/0.1ÁlÍ ~ÍÓÙàèíÀ¼ €½ ‰ €Ï ¡ ¡e½ … Ạ¦ ö² î1 K± †J ÃY° ‡> ¤¯ µ>
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