Usage of POSIX keys instead of task variables

[Christian Mauderer]

Hello,

I've planed to work on using POSIX keys instead of task variables in
the shell, the gxx_wrappers and rtems_rpc. This should makes it
possible to use the mentioned modules with SMP.

There is a small section in the Wiki regarding this topic:
http://www.rtems.org/wiki/index.php?title=SMP#Task_Variables

The POSIX keys are already outside the POSIX-API. To use them
efficiently the function pthread_once is also necessary. Sebastian
already sent a patch to make this function available for all
configurations.

My first step will be to extract the test for pthread_once out of the
psx01 test so that it can build independent of the POSIX-API.

After this the next steps will be to replace the task variables in the
mentioned modules.

Kind regards

Christian Mauderer

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