Jakub Jelinek wrote:
What actually matters is the size of PT_TLS segment of the shared library which defines those 2-3 __thread variables (I assume it is libGL.so, right?).
Generally, yes.
It would be good if the rest of __thread variables which aren't performance critical is provided by some other library (and accessed always through GD or LD model).
I guess it would be possible to have non-critical variables defined in the driver backend, say.
Forgot to say, the offsets are obviously constant (until you dlclose the library which declares them). If they weren't, one couldn't keep pointers to __thread variables around in IE/LE models.
The variables could move in the dynamic case, hence the function call to get their address. We're trying to avoid that, obviously :-)
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Gareth Hughes