pth_uctx_switch

[Stefan Brantschen]

I was wondering if, from the POV of the underlying mechanics of the 
machine contexts, the pre-condition for pth_uctx_switch that the 
"to"-context needs to be flagged as "configured" (uc_mctx_set == TRUE), 
really needs to hold in special case if the "to"-context is the same as 
the "from"-context?

That is, if the sequence
 r = pth_uctx_create (*ctx)
 r = pth_uctx_switch (ctx, ctx)
could/should be possible? Doesn't the "to"-context get configured 
through the switch quasi "atomically" so it _is_ actually configured at 
the time of the "switch-to" operation within pth_uctx_switch?

Background: this would ease the creation of the "main thread" in 
certain cases where the first context switch away from the main thread 
is hidden inside a scheduler. Now I solve it with a quick switch to and 
back from a dummy thread.

Thanks
- Stefan
--
Stefan Brantschen
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