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[SR-11854] OperationQueue not asynchronous #612

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swift-ci opened this issue Nov 25, 2019 · 2 comments
Closed

[SR-11854] OperationQueue not asynchronous #612

swift-ci opened this issue Nov 25, 2019 · 2 comments
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@lxbndr
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bug Foundation libdispatch

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@swift-ci
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Previous ID SR-11854
Radar rdar://problem/57549294
Original Reporter ZakMcK (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Swift Runtime

Swift version 5.1 (swift-5.1.2-RELEASE)
Target: x86_64-unknown-linux-gnu

OS

Additional Detail from JIRA
Votes 0
Component/s Foundation, libdispatch
Labels Bug
Assignee @lxbndr
Priority Medium

md5: 7ac99bf05c7d6c768f6910f21d555ebb

Issue Description:

I have a problem with the OperationQueue in the swift-5.1.2-RELEASE version. The whole OperationQueue seems to work synchronously with one single thread instead of using all available cores.

This worked with swift 5.0. Following example

let testQueue = OperationQueue()
testQueue.name = "TestAsync"
testQueue.maxConcurrentOperationCount = 4

for _ in 0...10 {
    testQueue.addOperation { 
        print("added \(Thread.current) on \(OperationQueue.current?.underlyingQueue?.label ?? "None")")
        //Thread.sleep(forTimeInterval: 1)
    }
    //print("OP COUNT: \(testQueue.operationCount)")
}

testQueue.waitUntilAllOperationsAreFinished()

yields this output

Hello, world!
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
OP COUNT: 1
done pushing operations
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None
added <Thread: 0x00007f8e14000c80> on None

I would assume that different threads should be incorporated (maxConcurrentOperationCount is set to 4).
@beccadax
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beccadax commented Dec 2, 2019

@swift-ci create

@lxbndr
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lxbndr commented Jan 18, 2021

apple/swift-corelibs-foundation#2937

@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
This issue was closed.
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bug Foundation libdispatch
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@beccadax @lxbndr @swift-ci