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​​Topic: Rustc-Rayon Sync

​​

​​Audience	​​compiler team, rayon folks
​​Key people	​​nikomatsakis, cuviper, mw
​​When	​​TBD
​​Where	​​TBD
​​Meeting Style	​​Discussion

​​Deliverables

• ​​Plan to resolve rustc-fork of rayon

• ​​Action plan

​​Homework to do before meeting

• ​​Write-up of what extensions rustc-rayon fork contains

• ​​Write-up of current parallelization design

• ​​Key unresolved questions

​​Agenda

• ​​Review locking strategy

• ​​What hacks are we still using? Can we stop?

• ​​How to reconcile rustc fork of rayon with mainline rayon

• ​​How to integrate job server?

• ​​Fibers

​​

​​Commits in rustc-rayon 0.1.2

​​https://github.com/rayon-rs/rayon/compare/master...rust-lang:crate-0.1.2

​​

• ​​729d7ccd2d25​ Add thread-local values which are preserved with jobs

• ​​e58b9c3e3ebe​ Add a main_handler which is passed an argument to run the proper main loop

• ​​used to nest the threads in TLS-with​-style initializers

• ​​can the proposed broadcast​ API cover this?

• ​​9815d97db161​ Add the ability to create scoped thread pools

• ​​used to permit a non-'static​ main handler

• ​​046336e36dbe​ Add a WorkerLocal type which allow you to hold a value per Rayon worker thread

• ​​0f55a9956583​ Add deadlock detection

• ​​detects that some threads are blocked, but no threads are active in the pool

• ​​as-is, misses the possibility of blocking on other pools

• ​​86060c2a978b​ Add callbacks for when threads start and stop doing work

• ​​51ee2fa77805​ Rename crates, update version and make clear this is not the real rayon crate

• ​​just minutia of creating a forked crate

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