[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Error message for the failure to create heartbeat thread is too specific. (#540)

[dcstes]

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On some Linux systems without PAM,

it might be a possibility to use "prlimit" to set rtprio:

https://serverfault.com/questions/889635/seting-rtprio-limit-in-system-without-pam

For example with 

 prlimit --rtprio=99 --pid=<pid of shell>

and then start squeak from that shell.

If the Linux system has no /etc/security directory that's a possibility.

Basically I think there are probably a great many different ways to achieve
the goal of suppressing the "pthread_setsched" message.

The current error message prints (1) a problem and (2) a Linux PAM specific
cookbookish recipe to solve it. 

However the error message could be limited to just (1) print the problem,
that's all ...  The user has then to figure out for themselves how to solve it.

David Stes

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