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Split non-CAS atomic support off into target_has_atomic_load_store #65214

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@Amanieu Amanieu commented Oct 8, 2019

This PR implements my proposed changes in #32976 (comment) by removing target_has_atomic = "cas" and splitting target_has_atomic into two separate cfgs:

  • target_has_atomic = 8/16/32/64/128: This indicates the largest width that the target can atomically CAS (which implies support for all atomic operations).
  • target_has_atomic_load_store = 8/16/32/64/128: This indicates the largest width that the target can support loading or storing atomically (but may not support CAS).

cc #32976

r? @alexcrichton

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 8, 2019
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Amanieu commented Oct 8, 2019

A small note on the code: in some places I do any(target_has_atomic_load_store = "8", target_has_atomic = "8") when target_has_atomic_load_store = "8" should imply both. This is necessary to support stage0 which doesn't have target_has_atomic_load_store.

src/libcore/sync/atomic.rs Outdated Show resolved Hide resolved
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Centril commented Oct 8, 2019

N.B. I wouldn't mind this as an internal refactoring but I don't think we should expose target_has_atomic or target_has_atomic_load_store to users. Rather, #64797 provides the same facilities.

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The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.
2019-10-08T16:14:17.8059985Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-08T16:14:17.8254716Z ##[command]git config gc.auto 0
2019-10-08T16:14:17.8338645Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-08T16:14:17.8411264Z ##[command]git config --get-all http.proxy
2019-10-08T16:14:17.8559127Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/65214/merge:refs/remotes/pull/65214/merge
---
2019-10-08T16:21:11.9140582Z    Compiling serde_json v1.0.40
2019-10-08T16:21:13.5519239Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-10-08T16:21:23.9120554Z     Finished release [optimized] target(s) in 1m 22s
2019-10-08T16:21:23.9206981Z tidy check
2019-10-08T16:21:24.5873263Z tidy error: /checkout/src/libcore/sync/atomic.rs:116: line longer than 100 chars
2019-10-08T16:21:24.5873900Z tidy error: /checkout/src/libcore/sync/atomic.rs:117: line longer than 100 chars
2019-10-08T16:21:25.7358083Z some tidy checks failed
2019-10-08T16:21:25.7358305Z 
2019-10-08T16:21:25.7358305Z 
2019-10-08T16:21:25.7359141Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-10-08T16:21:25.7359251Z 
2019-10-08T16:21:25.7359271Z 
2019-10-08T16:21:25.7414277Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-10-08T16:21:25.7414367Z Build completed unsuccessfully in 0:01:25
2019-10-08T16:21:25.7414367Z Build completed unsuccessfully in 0:01:25
2019-10-08T16:21:25.7418806Z == clock drift check ==
2019-10-08T16:21:25.7437917Z   local time: Tue Oct  8 16:21:25 UTC 2019
2019-10-08T16:21:25.8399874Z   network time: Tue, 08 Oct 2019 16:21:25 GMT
2019-10-08T16:21:25.8407225Z == end clock drift check ==
2019-10-08T16:21:27.2358213Z ##[error]Bash exited with code '1'.
2019-10-08T16:21:27.2397885Z ##[section]Starting: Checkout
2019-10-08T16:21:27.2399370Z ==============================================================================
2019-10-08T16:21:27.2399427Z Task         : Get sources
2019-10-08T16:21:27.2399462Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

@Amanieu Amanieu force-pushed the cfg_atomic branch 2 times, most recently from 1f8b717 to e46eb11 Compare October 8, 2019 18:58
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The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.
2019-10-08T18:59:22.8233574Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-08T18:59:23.3709845Z ##[command]git config gc.auto 0
2019-10-08T18:59:23.3715205Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-08T18:59:23.3725521Z ##[command]git config --get-all http.proxy
2019-10-08T18:59:23.3766880Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/65214/merge:refs/remotes/pull/65214/merge
---
2019-10-08T19:26:10.3429064Z    Compiling rustc_codegen_ssa v0.0.0 (/checkout/src/librustc_codegen_ssa)
2019-10-08T19:27:11.3484862Z    Compiling rustc_save_analysis v0.0.0 (/checkout/src/librustc_save_analysis)
2019-10-08T19:27:59.1944740Z    Compiling rustc_plugin v0.0.0 (/checkout/src/librustc_plugin/deprecated)
2019-10-08T19:30:18.1180853Z    Compiling rustc-main v0.0.0 (/checkout/src/rustc)
2019-10-08T19:30:18.3678809Z error: linking with `cc` failed: exit code: 1
2019-10-08T19:30:18.3679522Z   |
2019-10-08T19:30:18.3682045Z   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_binary-ff7ef2a49a698d0a.rustc_binary.b9c6s0cq-cgu.0.rcgu.o" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_binary-ff7ef2a49a698d0a.rustc_binary.b9c6s0cq-cgu.1.rcgu.o" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc_binary-ff7ef2a49a698d0a" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-Wl,-O1" "-nodefaultlibs" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/backtrace-sys-c5a99509fe2f0f44/out" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/miniz-sys-cde8801c1a0250cb/out" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-lrustc_driver-dc46f81f35f7db72" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-ltest-4441714d48a81082" "-Wl,--start-group" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lstd-539b46668317e4b1" "-Wl,--end-group" "-Wl,-Bstatic" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-58f6922a5d63f76a.rlib" "-Wl,-Bdynamic" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil" "-Wl,-rpath,$ORIGIN/../lib"
2019-10-08T19:30:18.3682846Z   = note: /checkout/obj/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-539b46668317e4b1.so: undefined reference to `__sync_val_compare_and_swap_16'
2019-10-08T19:30:18.3683092Z           collect2: error: ld returned 1 exit status
2019-10-08T19:30:18.3683360Z 
2019-10-08T19:30:18.3753489Z error: aborting due to previous error
2019-10-08T19:30:18.3753661Z 
2019-10-08T19:30:18.3931868Z error: could not compile `rustc-main`.
---
2019-10-08T19:30:18.4057326Z == clock drift check ==
2019-10-08T19:30:18.4079146Z   local time: Tue Oct  8 19:30:18 UTC 2019
2019-10-08T19:30:18.5013578Z   network time: Tue, 08 Oct 2019 19:30:18 GMT
2019-10-08T19:30:18.5015332Z == end clock drift check ==
2019-10-08T19:30:21.0151165Z ##[error]Bash exited with code '1'.
2019-10-08T19:30:21.0199463Z ##[section]Starting: Checkout
2019-10-08T19:30:21.0201615Z ==============================================================================
2019-10-08T19:30:21.0201666Z Task         : Get sources
2019-10-08T19:30:21.0201728Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

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r=me on the code changes here, although I'm travleing this week so I'm not abreast of the conversation happening in the thread. If it's reached consensus this is the way to go feel free to send it through bors! Otherwise I'll check in when I'm back next week to catch up on the thread

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Amanieu commented Oct 13, 2019

@bors r=alexcrichton

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bors commented Oct 13, 2019

📌 Commit dfe76a1 has been approved by alexcrichton

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 13, 2019
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bors commented Oct 13, 2019

⌛ Testing commit dfe76a1 with merge e45bc382e7333fd3fcc3da15d147faaf89062ea7...

Centril added a commit to Centril/rust that referenced this pull request Oct 13, 2019
Split non-CAS atomic support off into target_has_atomic_load_store

This PR implements my proposed changes in rust-lang#32976 (comment) by removing `target_has_atomic = "cas"` and splitting `target_has_atomic` into two separate `cfg`s:

* `target_has_atomic = 8/16/32/64/128`: This indicates the largest width that the target can atomically CAS (which implies support for all atomic operations).
* ` target_has_atomic_load_store = 8/16/32/64/128`: This indicates the largest width that the target can support loading or storing atomically (but may not support CAS).

cc rust-lang#32976

r? @alexcrichton
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Centril commented Oct 13, 2019

@bors retry rolled up.

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bors commented Oct 13, 2019

⌛ Testing commit dfe76a1 with merge 0c36b2a3c2faf937a78f91b104515ff4b79bd6a1...

Centril added a commit to Centril/rust that referenced this pull request Oct 13, 2019
Split non-CAS atomic support off into target_has_atomic_load_store

This PR implements my proposed changes in rust-lang#32976 (comment) by removing `target_has_atomic = "cas"` and splitting `target_has_atomic` into two separate `cfg`s:

* `target_has_atomic = 8/16/32/64/128`: This indicates the largest width that the target can atomically CAS (which implies support for all atomic operations).
* ` target_has_atomic_load_store = 8/16/32/64/128`: This indicates the largest width that the target can support loading or storing atomically (but may not support CAS).

cc rust-lang#32976

r? @alexcrichton
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Centril commented Oct 13, 2019

@bors retry rolled up.

bors added a commit that referenced this pull request Oct 13, 2019
Rollup of 10 pull requests

Successful merges:

 - #65214 (Split non-CAS atomic support off into target_has_atomic_load_store)
 - #65246 (vxWorks: implement get_path() and get_mode() for File fmt::Debug)
 - #65312 (improve performance of signed saturating_mul)
 - #65336 (Fix typo in task::Waker)
 - #65346 (nounwind tests and cleanup)
 - #65347 (Fix #[unwind(abort)] with Rust ABI)
 - #65366 (Implement Error::source on IntoStringError + Remove superfluous cause impls)
 - #65369 (Don't discard value names when using address or memory sanitizer)
 - #65370 (Add `dyn` to `Any` documentation)
 - #65373 (Fix typo in docs for `Rc`)

Failed merges:

r? @ghost
@bors bors merged commit dfe76a1 into rust-lang:master Oct 13, 2019
bors bot added a commit to crossbeam-rs/crossbeam that referenced this pull request Oct 15, 2019
428: Fix breakage with nightly feature r=jeehoonkang a=taiki-e

`target_has_atomic = "cas"` was removed in rust-lang/rust#65214.

Fixes rust-lang/rust#65424 



Co-authored-by: Taiki Endo <te316e89@gmail.com>
bors bot added a commit to crossbeam-rs/crossbeam that referenced this pull request Oct 15, 2019
428: Fix breakage with nightly feature r=jeehoonkang a=taiki-e

`target_has_atomic = "cas"` was removed in rust-lang/rust#65214.

Fixes rust-lang/rust#65424 
Fixes #412


Co-authored-by: Taiki Endo <te316e89@gmail.com>
bors bot added a commit to crossbeam-rs/crossbeam that referenced this pull request Oct 16, 2019
428: Fix build failure on nightly and the minimum version r=jeehoonkang a=taiki-e

`target_has_atomic = "cas"` was removed in rust-lang/rust#65214.

Fixes rust-lang/rust#65424 
Fixes #412


Co-authored-by: Taiki Endo <te316e89@gmail.com>
bors bot added a commit to crossbeam-rs/crossbeam that referenced this pull request Oct 16, 2019
428: Fix build failure on nightly and the minimum version r=jeehoonkang a=taiki-e

`target_has_atomic = "cas"` was removed in rust-lang/rust#65214.

Fixes rust-lang/rust#65424 
Fixes #412


Co-authored-by: Taiki Endo <te316e89@gmail.com>
#[stable(feature = "unwind_safe_atomic_refs", since = "1.14.0")]
impl RefUnwindSafe for atomic::AtomicUsize {}
#[cfg(target_has_atomic = "8")]
#[cfg(target_hastarget_has_atomic_load_store_atomic = "8")]

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copypaste error?

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Oops #65663

Amanieu added a commit to Amanieu/rust that referenced this pull request Oct 21, 2019
Centril added a commit to Centril/rust that referenced this pull request Oct 21, 2019
Centril added a commit to Centril/rust that referenced this pull request Oct 21, 2019
bors added a commit that referenced this pull request Oct 22, 2019
Rollup of 7 pull requests

Successful merges:

 - #62330 (Change untagged_unions to not allow union fields with drop)
 - #65092 (make is_power_of_two a const function)
 - #65621 (miri: add write_bytes method to Memory doing bounds-checks and supporting iterators)
 - #65647 (Remove unnecessary trait bounds and derivations)
 - #65653 (keep the root dir clean from debugging)
 - #65660 (Rename `ConstValue::Infer(InferConst::Canonical(..))` to `ConstValue::Bound(..)`)
 - #65663 (Fix typo from #65214)

Failed merges:

r? @ghost
bors bot added a commit to bossmc/pinboard that referenced this pull request Nov 7, 2019
16: Update crossbeam-epoch requirement from 0.7.0 to 0.8.0 r=bossmc a=dependabot-preview[bot]

Updates the requirements on [crossbeam-epoch](https://github.com/crossbeam-rs/crossbeam) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [crossbeam-epoch's changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md).*

> # Version 0.7.3
> 
> - Fix breakage with nightly feature due to [rust-lang/rust#65214](https://github-redirect.dependabot.com/rust-lang/rust/issues/65214).
> - Bump `crossbeam-channel` to `0.4`.
> - Bump `crossbeam-epoch` to `0.8`.
> - Bump `crossbeam-queue` to `0.2`.
> - Bump `crossbeam-utils` to `0.7`.
> 
> # Version 0.7.2
> 
> - Bump `crossbeam-channel` to `0.3.9`.
> - Bump `crossbeam-epoch` to `0.7.2`.
> - Bump `crossbeam-utils` to `0.6.6`.
> 
> # Version 0.7.1
> 
> - Bump `crossbeam-utils` to `0.6.5`.
> 
> # Version 0.7.0
> 
> - Remove `ArcCell`, `MsQueue`, and `TreiberStack`.
> - Change the interface of `ShardedLock` to match `RwLock`.
> - Add `SegQueue::len()`.
> - Rename `SegQueue::try_pop()` to `SegQueue::pop()`.
> - Change the return type of `SegQueue::pop()` to `Result`.
> - Introduce `ArrayQueue`.
> - Update dependencies.
> 
> # Version 0.6.0
> 
> - Update dependencies.
> 
> # Version 0.5.0
> 
> - Update `crossbeam-channel` to 0.3.
> - Update `crossbeam-utils` to 0.6.
> - Add `AtomicCell`, `SharedLock`, and `WaitGroup`.
> 
> # Version 0.4.1
> 
> - Fix a double-free bug in `MsQueue` and `SegQueue`.
> 
> # Version 0.4
> 
> - Switch to the new implementation of epoch-based reclamation in
>   [`crossbeam-epoch`](https://github.com/crossbeam-rs/crossbeam-epoch), fixing numerous bugs in the
>   old implementation.  Its API is changed in a backward-incompatible way.
> - Switch to the new implementation of `CachePadded` and scoped thread in
>   [`crossbeam-utils`](https://github.com/crossbeam-rs/crossbeam-utils).  The scoped thread API is
>   changed in a backward-incompatible way.
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`28ad2b7`](crossbeam-rs/crossbeam@28ad2b7) Update versions in readmes
- [`c98fea1`](crossbeam-rs/crossbeam@c98fea1) Merge [#444](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/444)
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- [`99762ee`](crossbeam-rs/crossbeam@99762ee) Merge [#442](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/442)
- [`ebb6b5f`](crossbeam-rs/crossbeam@ebb6b5f) Do not perform superfluous bounds checks on drop
- [`d2ab7a5`](crossbeam-rs/crossbeam@d2ab7a5) Update LICENSE-APACHE
- [`f54db88`](crossbeam-rs/crossbeam@f54db88) Merge [#437](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/437)
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bors bot added a commit to pitkley/dfw that referenced this pull request Nov 8, 2019
155: Bump crossbeam-channel from 0.3.9 to 0.4.0 r=pitkley a=dependabot-preview[bot]

[//]: # (dependabot-start)
⚠️  **Dependabot is rebasing this PR** ⚠️ 

If you make any changes to it yourself then they will take precedence over the rebase.

---

[//]: # (dependabot-end)

Bumps [crossbeam-channel](https://github.com/crossbeam-rs/crossbeam) from 0.3.9 to 0.4.0.
<details>
<summary>Changelog</summary>

*Sourced from [crossbeam-channel's changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md).*

> # Version 0.7.3
> 
> - Fix breakage with nightly feature due to [rust-lang/rust#65214](https://github-redirect.dependabot.com/rust-lang/rust/issues/65214).
> - Bump `crossbeam-channel` to `0.4`.
> - Bump `crossbeam-epoch` to `0.8`.
> - Bump `crossbeam-queue` to `0.2`.
> - Bump `crossbeam-utils` to `0.7`.
> 
> # Version 0.7.2
> 
> - Bump `crossbeam-channel` to `0.3.9`.
> - Bump `crossbeam-epoch` to `0.7.2`.
> - Bump `crossbeam-utils` to `0.6.6`.
> 
> # Version 0.7.1
> 
> - Bump `crossbeam-utils` to `0.6.5`.
> 
> # Version 0.7.0
> 
> - Remove `ArcCell`, `MsQueue`, and `TreiberStack`.
> - Change the interface of `ShardedLock` to match `RwLock`.
> - Add `SegQueue::len()`.
> - Rename `SegQueue::try_pop()` to `SegQueue::pop()`.
> - Change the return type of `SegQueue::pop()` to `Result`.
> - Introduce `ArrayQueue`.
> - Update dependencies.
> 
> # Version 0.6.0
> 
> - Update dependencies.
> 
> # Version 0.5.0
> 
> - Update `crossbeam-channel` to 0.3.
> - Update `crossbeam-utils` to 0.6.
> - Add `AtomicCell`, `SharedLock`, and `WaitGroup`.
> 
> # Version 0.4.1
> 
> - Fix a double-free bug in `MsQueue` and `SegQueue`.
> 
> # Version 0.4
> 
> - Switch to the new implementation of epoch-based reclamation in
>   [`crossbeam-epoch`](https://github.com/crossbeam-rs/crossbeam-epoch), fixing numerous bugs in the
>   old implementation.  Its API is changed in a backward-incompatible way.
> - Switch to the new implementation of `CachePadded` and scoped thread in
>   [`crossbeam-utils`](https://github.com/crossbeam-rs/crossbeam-utils).  The scoped thread API is
>   changed in a backward-incompatible way.
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`28ad2b7`](crossbeam-rs/crossbeam@28ad2b7) Update versions in readmes
- [`c98fea1`](crossbeam-rs/crossbeam@c98fea1) Merge [#444](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/444)
- [`d953f49`](crossbeam-rs/crossbeam@d953f49) Add compatibility section to readme
- [`c76f145`](crossbeam-rs/crossbeam@c76f145) Prepare for the next release
- [`99762ee`](crossbeam-rs/crossbeam@99762ee) Merge [#442](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/442)
- [`ebb6b5f`](crossbeam-rs/crossbeam@ebb6b5f) Do not perform superfluous bounds checks on drop
- [`d2ab7a5`](crossbeam-rs/crossbeam@d2ab7a5) Update LICENSE-APACHE
- [`f54db88`](crossbeam-rs/crossbeam@f54db88) Merge [#437](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/437)
- [`caa52c4`](crossbeam-rs/crossbeam@caa52c4) Merge [#436](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/436)
- [`af68803`](crossbeam-rs/crossbeam@af68803) Merge [#438](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/438)
- Additional commits viewable in [compare view](crossbeam-rs/crossbeam@crossbeam-channel-0.3.9...crossbeam-channel-0.4.0)
</details>
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bors bot added a commit to pitkley/dfw that referenced this pull request Nov 8, 2019
155: Bump crossbeam-channel from 0.3.9 to 0.4.0 r=pitkley a=dependabot-preview[bot]

Bumps [crossbeam-channel](https://github.com/crossbeam-rs/crossbeam) from 0.3.9 to 0.4.0.
<details>
<summary>Changelog</summary>

*Sourced from [crossbeam-channel's changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md).*

> # Version 0.7.3
> 
> - Fix breakage with nightly feature due to [rust-lang/rust#65214](https://github-redirect.dependabot.com/rust-lang/rust/issues/65214).
> - Bump `crossbeam-channel` to `0.4`.
> - Bump `crossbeam-epoch` to `0.8`.
> - Bump `crossbeam-queue` to `0.2`.
> - Bump `crossbeam-utils` to `0.7`.
> 
> # Version 0.7.2
> 
> - Bump `crossbeam-channel` to `0.3.9`.
> - Bump `crossbeam-epoch` to `0.7.2`.
> - Bump `crossbeam-utils` to `0.6.6`.
> 
> # Version 0.7.1
> 
> - Bump `crossbeam-utils` to `0.6.5`.
> 
> # Version 0.7.0
> 
> - Remove `ArcCell`, `MsQueue`, and `TreiberStack`.
> - Change the interface of `ShardedLock` to match `RwLock`.
> - Add `SegQueue::len()`.
> - Rename `SegQueue::try_pop()` to `SegQueue::pop()`.
> - Change the return type of `SegQueue::pop()` to `Result`.
> - Introduce `ArrayQueue`.
> - Update dependencies.
> 
> # Version 0.6.0
> 
> - Update dependencies.
> 
> # Version 0.5.0
> 
> - Update `crossbeam-channel` to 0.3.
> - Update `crossbeam-utils` to 0.6.
> - Add `AtomicCell`, `SharedLock`, and `WaitGroup`.
> 
> # Version 0.4.1
> 
> - Fix a double-free bug in `MsQueue` and `SegQueue`.
> 
> # Version 0.4
> 
> - Switch to the new implementation of epoch-based reclamation in
>   [`crossbeam-epoch`](https://github.com/crossbeam-rs/crossbeam-epoch), fixing numerous bugs in the
>   old implementation.  Its API is changed in a backward-incompatible way.
> - Switch to the new implementation of `CachePadded` and scoped thread in
>   [`crossbeam-utils`](https://github.com/crossbeam-rs/crossbeam-utils).  The scoped thread API is
>   changed in a backward-incompatible way.
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`28ad2b7`](crossbeam-rs/crossbeam@28ad2b7) Update versions in readmes
- [`c98fea1`](crossbeam-rs/crossbeam@c98fea1) Merge [#444](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/444)
- [`d953f49`](crossbeam-rs/crossbeam@d953f49) Add compatibility section to readme
- [`c76f145`](crossbeam-rs/crossbeam@c76f145) Prepare for the next release
- [`99762ee`](crossbeam-rs/crossbeam@99762ee) Merge [#442](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/442)
- [`ebb6b5f`](crossbeam-rs/crossbeam@ebb6b5f) Do not perform superfluous bounds checks on drop
- [`d2ab7a5`](crossbeam-rs/crossbeam@d2ab7a5) Update LICENSE-APACHE
- [`f54db88`](crossbeam-rs/crossbeam@f54db88) Merge [#437](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/437)
- [`caa52c4`](crossbeam-rs/crossbeam@caa52c4) Merge [#436](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/436)
- [`af68803`](crossbeam-rs/crossbeam@af68803) Merge [#438](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/438)
- Additional commits viewable in [compare view](crossbeam-rs/crossbeam@crossbeam-channel-0.3.9...crossbeam-channel-0.4.0)
</details>
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mati865 added a commit to mati865/rust that referenced this pull request Aug 23, 2020
bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 25, 2020
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