pthread_getspecific return null

[weiqingtangx]

Hi Kazade,
Thanks for your greate job to create this useful math library.
I use it both in my ios and android project, it works well in my ios project, however in my android project, the function "pthread_getspecific(current_context_key)" always return null, it was called in a sub thread named GLThread, as below img:

Could you please tell me why this case and how to solve it?
Thanks.