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[SR-3431] DispatchSource Read/Write Events on Linux #705

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swift-ci opened this issue Dec 15, 2016 · 4 comments
Closed

[SR-3431] DispatchSource Read/Write Events on Linux #705

swift-ci opened this issue Dec 15, 2016 · 4 comments
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bug libdispatch

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Previous ID SR-3431
Radar None
Original Reporter tannernelson (JIRA User)
Type Bug
Status Closed
Resolution Duplicate
Additional Detail from JIRA
Votes 0
Component/s libdispatch
Labels Bug
Assignee None
Priority Medium

md5: 659d899ef7f986d14a9de6727599599f

relates to:

  • SR-3360 on Linux, using DispatchIO with reading and writing simultaneously to a channel can cause the program to hang

Issue Description:

We're running into an issue where, on Linux, `DispatchSourceRead` stops generating events after the `DispatchSourceWrite` has been added.

We have two `DispatchSource`s bound to our socket's file descriptor: One for reading (which calls a handler whenever the socket has data that can be read) and one for writing (which calls a handler whenever the socket is ready to send data).

On macOS, they seem to work independently and all of our tests are passing.
@ddunbar
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ddunbar commented Dec 15, 2016

/cc dgrove-oss (JIRA User), can you suggest who is best suited to investigate?

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Comment by David Grove (JIRA)

Adding phabouzit (JIRA User). I am pretty sure this is hitting a limitation of libkqueue on Linux and the discussion SR-3360 is relevant.

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Comment by Pierre Habouzit (JIRA)

Dupe of SR-3360

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Comment by Pierre Habouzit (JIRA)

Will be fixed by https://github.com/apple/swift-corelibs-libdispatch/compare/das-darwin-libdispatch-806-merge-master

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
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@ddunbar @swift-ci