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worker: spin uv_run twice before closing loop #26138

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On Windows, the Platform’s uv_async_t may need two iterations
before closing when it was previously in use.

Refs: #26089
Refs: #26006

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

On Windows, the Platform’s `uv_async_t` may need two iterations
before closing when it was previously in use.

Refs: nodejs#26089
Refs: nodejs#26006
@addaleax addaleax added the worker Issues and PRs related to Worker support. label Feb 15, 2019
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 15, 2019
// Need to run the loop twice more to close the platform's uv_async_t
// TODO(addaleax): It would be better for the platform itself to provide
// some kind of notification when it has fully cleaned up.
uv_run(&loop_, UV_RUN_ONCE);
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Should this be in a #ifdef Win32 or similar?

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Why not UV_RUN_DEFAULT? My concern is that some platform-specific libuv change may at some point require a different arbitrary number or runs.

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@eugeneo Because we want to not keep spinning the event loop indefinitely, which could happen if e.g. addons still have active handles (which we currently crash for, which is what we want).

I agree that this is hacky – hence the TODO – but I wouldn’t expect libuv to change anything here (and if they do, we’d notice because they run Node.js in the libuv CI).

@Fishrock123 I don’t have strong feelings about that, I can add it if you want.

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Perhaps we should keep the behavior consistent then.

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addaleax commented Feb 15, 2019

CI: https://ci.nodejs.org/job/node-test-pull-request/20802/ (:heavy_check_mark:)

@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 16, 2019
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Landed in 1d51353

@addaleax addaleax closed this Feb 17, 2019
@addaleax addaleax deleted the worker-run-twice branch February 17, 2019 23:07
addaleax added a commit that referenced this pull request Feb 17, 2019
On Windows, the Platform’s `uv_async_t` may need two iterations
before closing when it was previously in use.

Refs: #26089
Refs: #26006

PR-URL: #26138
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
addaleax added a commit that referenced this pull request Feb 18, 2019
On Windows, the Platform’s `uv_async_t` may need two iterations
before closing when it was previously in use.

Refs: #26089
Refs: #26006

PR-URL: #26138
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
@BridgeAR BridgeAR mentioned this pull request Feb 26, 2019
rvagg pushed a commit that referenced this pull request Feb 28, 2019
On Windows, the Platform’s `uv_async_t` may need two iterations
before closing when it was previously in use.

Refs: #26089
Refs: #26006

PR-URL: #26138
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
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