I know wrap with a goroutine can fix it. I just wonder why must use an
extra goroutine?
在 2018年2月7日星期三 UTC+8下午11:00:25，matthe...@gmail.com写道：
>
> Desynchronizing "case idle <- <-source:" fixes it:
>
> case v := <-source:
> go func () { idle <- v }()
>
> I added a counter to break after a number of loops since it goes
> infinitely: https://play.golang.org/p/aZbmTKvpxcD
>
> Matt
>
> On Wednesday, February 7, 2018 at 8:38:41 AM UTC-6, Damon Zhao wrote:
>>
>> Please answer these questions before submitting your issue. Thanks!
>> What version of Go are you using (go version)?
>>
>> go version go1.9.3 darwin/amd64
>> Does this issue reproduce with the latest release?
>>
>> yes
>> What operating system and processor architecture are you using (go env)?
>> GOARCH="amd64"
>> GOBIN=""
>> GOEXE=""
>> GOHOSTARCH="amd64"
>> GOHOSTOS="darwin"
>> GOOS="darwin"
>> GOPATH="/Users/ariesdevil/Dropbox/workspace/go_workspace"
>> GORACE=""
>> GOROOT="/usr/local/Cellar/go/1.9.3/libexec"
>> GOTOOLDIR="/usr/local/Cellar/go/1.9.3/libexec/pkg/tool/darwin_amd64"
>> GCCGO="gccgo"
>> CC="clang"
>> GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments
>> -fmessage-length=0
>> -fdebug-prefix-map=/var/folders/h2/xl15t9g94tgfwclshzl086bh0000gp/T/go-build125147941=/tmp/go-build
>>
>> -gno-record-gcc-switches -fno-common"
>> CXX="clang++"
>> CGO_ENABLED="1"
>> CGO_CFLAGS="-g -O2"
>> CGO_CPPFLAGS=""
>> CGO_CXXFLAGS="-g -O2"
>> CGO_FFLAGS="-g -O2"
>> CGO_LDFLAGS="-g -O2"
>> PKG_CONFIG="pkg-config"
>>
>> What did you do?
>>
>> code1: play.golang.org/p/8rcO11QS8un (@ianlancetaylor answerd at
>> https://github.com/golang/go/issues/23728#issuecomment-363771924)
>>
>>
>> code2: https://play.golang.org/p/fJXhK8w22uu
>>
>> Above code2 sometimes run perfect and sometimes deadlock on my machine.
>>
>>
>> <https://lh3.googleusercontent.com/-j-2Sg_4wENk/WnsPXZktt7I/AAAAAAAAb9M/vI8Ci9g8k9gZ_83XWS6qgR2bxjuHN8w1ACLcBGAs/s1600/%25E5%25B1%258F%25E5%25B9%2595%25E5%25BF%25AB%25E7%2585%25A7%2B2018-02-07%2B22.10.22.png>
>>
>>
>>
>> But if I put it in a goroutine, the result is confused:
>>
>>
>> https://play.golang.org/p/oUmMr8TM2sz success
>>
>> https://play.golang.org/p/54eLI7x5FwD failed
>>
>>
>> notice line 25 when I use
>>
>> ```
>>
>> case worker := <-source:
>>
>> idle <- worker
>>
>> ```
>>
>> instead of:
>>
>> ```
>>
>> case idle <- <-source:
>>
>> ```
>>
>> it works.
>> What did you expect to see?
>>
>> I think it should not deadlock.
>> What did you see instead?
>> deadlock sometimes.
>>
>>
>>
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