[9fans] undefined reference to `sched_yield'

[9fans] undefined reference to `sched_yield'

[Matt]

OpenBSD 4.0 running in QEmu 0.8.2 on FreeBSD 6.0


# cd /usr/local/plan9
# ./INSTALL
* Resetting /usr/local/plan9/config
* Building everything (be patient)...
 >>> cd /usr/local/plan9/src/cmd; mk all
9l -o o.9p 9p.o
/usr/local/plan9/src/lib9/sleep.c:25: undefined reference to `sched_yield'
collect2: ld returned 1 exit status
mk: 9l -o o.9p ...  : exit status=exit(1)
mk: for i in ...  : exit status=exit(1)
#

MD5 (plan9port.tgz) = e6aba1ebf35fe0407304069dd1ea35c8

Re: [9fans] undefined reference to `sched_yield'

[geoff]

It looks like it's called pthread_yield in OpenBSD.

Re: [9fans] undefined reference to `sched_yield'

[Tim Wiess]

    this is my fault. the developers added a real sched_yield in 3.9
    but was not built into the kernel by default. i assumed it would be
    for 4.0, but they just turned it on only after the release.

    i'll send a patch over to Russ which will fix this for 4.0 systems.
    sorry about that.

    tim


> OpenBSD 4.0 running in QEmu 0.8.2 on FreeBSD 6.0
>
>
> # cd /usr/local/plan9
> # ./INSTALL
> * Resetting /usr/local/plan9/config
> * Building everything (be patient)...
>  >>> cd /usr/local/plan9/src/cmd; mk all
> 9l -o o.9p 9p.o
> /usr/local/plan9/src/lib9/sleep.c:25: undefined reference to `sched_yield'
> collect2: ld returned 1 exit status
> mk: 9l -o o.9p ...  : exit status=exit(1)
> mk: for i in ...  : exit status=exit(1)
> #
>
> MD5 (plan9port.tgz) = e6aba1ebf35fe0407304069dd1ea35c8

Re: [9fans] undefined reference to `sched_yield'

[Russ Cox]

Patch applied.  You should be able to

  cd /usr/local/plan9/src/lib9
  cvs up sleep.c

and then build as usual.

(You can cvs up a downloaded archive.)

Russ

Re: [9fans] undefined reference to `sched_yield'

[Tim Wiess]

btw, if you don't want to wait, just change the version number
in the OpenBSD check in src/lib9/sleep.c to 200611.

if you run -current though, you shouldn't need to change anything.


> OpenBSD 4.0 running in QEmu 0.8.2 on FreeBSD 6.0
>
>
> # cd /usr/local/plan9
> # ./INSTALL
> * Resetting /usr/local/plan9/config
> * Building everything (be patient)...
>  >>> cd /usr/local/plan9/src/cmd; mk all
> 9l -o o.9p 9p.o
> /usr/local/plan9/src/lib9/sleep.c:25: undefined reference to `sched_yield'
> collect2: ld returned 1 exit status
> mk: 9l -o o.9p ...  : exit status=exit(1)
> mk: for i in ...  : exit status=exit(1)
> #
>
> MD5 (plan9port.tgz) = e6aba1ebf35fe0407304069dd1ea35c8

Re: [9fans] undefined reference to `sched_yield'

[Matt]

 > btw, if you don't want to wait, just change the version number

> in the OpenBSD check in src/lib9/sleep.c to 200611.

thank you, this worked


matt

Re: [9fans] undefined reference to `sched_yield'

[Chad Dougherty]

Matt wrote:
> OpenBSD 4.0 running in QEmu 0.8.2 on FreeBSD 6.0
>
>

Note of caution about using OpenBSD in qemu:

<http://www.andrew.cmu.edu/user/crd/qemu_openbsd_note.html>

Re: [9fans] undefined reference to `sched_yield'

[Matt]

> Note of caution about using OpenBSD in qemu:
>
> http://www.andrew.cmu.edu/user/crd/qemu_openbsd_note.html

thanks, won't be long before we see the first exploit through
virtualization now that VMs are becoming a popular choice for hosting co's