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'time.Sleep(); blocks child after fork if 'rand.Reader.Read()' is used before #6664

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gopherbot opened this issue Oct 25, 2013 · 4 comments
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'time.Sleep(); blocks child after fork if 'rand.Reader.Read()' is used before #6664

gopherbot opened this issue Oct 25, 2013 · 4 comments
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FrozenDueToAge Unfortunate

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@gopherbot
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by mihael.dimec:

What steps will reproduce the problem?
 Compile and run example.

What is the expected output?
miha@miha-work:~/testi/go_sleep $ ./go_sleep
strength =  3 cnt =  3
Parent before sleep
[6 15 113]
Child before sleep
[6 15 113]
Parent after sleep
Child after sleep

What do you see instead?
miha@miha-work:~/testi/go_sleep $ ./go_sleep
strength =  3 cnt =  3
Parent before sleep
[6 15 113]
Child before sleep
[6 15 113]
Parent after sleep


Which compiler are you using (5g, 6g, 8g, gccgo)?
go build

Which operating system are you using?
Ubuntu 12.10
Linux miha-work 3.5.0-32-generic #53-Ubuntu SMP Wed May 29 20:23:04 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux


Which version are you using?  (run 'go version')
go version go1.1.2 linux/amd64

Forked child will block at 'time.Sleep(time.Milliecond)' function call, if
'rand.Reader.Read(k)' before fork.

Attachments:

  1. main.go (915 bytes)
@cznic
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cznic commented Oct 25, 2013

Comment 1:

Go programs do not support forking.

@gopherbot
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Comment 2 by mihael.dimec:

Thank you for response.
I don't understand two things.
1.) Why am I able to fork if I'm not suppose to?
2.) Fork is basic and common system call. Why fork is not supported?

@cznic
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cznic commented Oct 25, 2013

Comment 3:

1. Using syscalls is always on your own responsibility.
2. See eg. https://groups.google.com/d/msg/golang-nuts/KynZO5BQGks/nlTgevsrJJUJ

@ianlancetaylor
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Comment 4:

There is no reasonable way for a threaded program to call fork, and Go programs are
always threaded.
You didn't say why you want to call fork, but you may want to look at issue #227.

Status changed to Unfortunate.

@golang golang locked and limited conversation to collaborators Jun 25, 2016
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@cznic @ianlancetaylor @gopherbot