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Update README.txt

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This commit is contained in:
Gregory Nutt 2016-02-19 15:35:02 -06:00
parent 78c0b30140
commit da751159ef
1 changed files with 7 additions and 1 deletions
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8
configs/sim/README.txt
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@ -233,7 +233,13 @@ SMP
At present, the SMP simulation is not fully functional: It does operate
on the simulated CPU threads for a few context switches then fails during
a setjmp() operation. I suspect that this is not an issue with the NuttX
SMP logic but more likely some chaos in the pthread controls.
SMP logic but more likely some chaos in the pthread controls. I have seen
similar such strange behavior other times that I have tried to use
setjmp/longmp from a signal handler! Like when I tried to implement
simulated interrupts using signals.
Apparently, if longjmp is invoked from the context of a signal handler,
the result is undefined: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1318.htm
You can enable SMP for ostest configuration by enabling: