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doc: add note about fs.close undefined behavior #30966

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doc: add note about fs.close undefined behavior #30966

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@ronag ronag commented Dec 14, 2019

Basically what the close(2) man page says – if it’s possible that the fd is being used for a syscall in one thread of the threadpool, we should not be calling close() concurrently.

Refs: #30864

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added doc Issues and PRs related to the documentations. fs Issues and PRs related to the fs subsystem / file system. labels Dec 14, 2019
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ronag commented Dec 14, 2019

@addaleax

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ronag commented Dec 14, 2019

We might want to consider adding a ref count on fs ops and provide an unsafe version that does not do so (i.e. use at own risk but with better perf).

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ronag commented Dec 14, 2019

Is that disagreement or confusion on the previous comment?

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@ronag It’s both … I feel like the suggestion misses a compelling reason to be implemented?

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ronag commented Dec 14, 2019

I feel like the suggestion misses a compelling reason to be implemented?

Consider the amount of users that are not aware of this quirk and are ending up unknowingly with code with undefined behaviour.

I'm also sceptical whether that's compelling enough. Probably isn't as bad in practice as I make it sound. Just thought it might be worth to consider.

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LGTM with two small suggestions applied.

ronag and others added 2 commits December 15, 2019 01:22
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Update doc/api/fs.md
bc751b3 
Co-Authored-By: Rich Trott <[email protected]>
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Update doc/api/fs.md
6fa8257 
Co-Authored-By: Rich Trott <[email protected]>
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ronag commented Dec 15, 2019 •
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Added note to closeSync as well.

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Dec 15, 2019
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Lite-CI https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/4108/

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Trott pushed a commit that referenced this pull request Dec 17, 2019
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doc: add note about fs.close() about undefined behavior
b376965 
Add notes to fs.close and fs.closeSync() about udnefined behavior.

PR-URL: #30966
Refs: #30864
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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Trott commented Dec 17, 2019

Landed in b376965

@Trott Trott closed this Dec 17, 2019
MylesBorins pushed a commit that referenced this pull request Dec 17, 2019
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doc: add note about fs.close() about undefined behavior
3abcb69 
Add notes to fs.close and fs.closeSync() about udnefined behavior.

PR-URL: #30966
Refs: #30864
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Dec 17, 2019
Merged
targos pushed a commit that referenced this pull request Jan 14, 2020
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doc: add note about fs.close() about undefined behavior
42ccf22 
Add notes to fs.close and fs.closeSync() about udnefined behavior.

PR-URL: #30966
Refs: #30864
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@targos targos mentioned this pull request Jan 15, 2020
Closed
BethGriggs pushed a commit that referenced this pull request Feb 6, 2020
@ronag @BethGriggs
doc: add note about fs.close() about undefined behavior
95eb1c2 
Add notes to fs.close and fs.closeSync() about udnefined behavior.

PR-URL: #30966
Refs: #30864
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Feb 8, 2020
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@BridgeAR BridgeAR BridgeAR approved these changes

@lpinca lpinca lpinca approved these changes

@addaleax addaleax addaleax approved these changes

@Trott Trott Trott approved these changes

@jasnell jasnell jasnell approved these changes

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