why the strange stack stuf in cygwin?

[Jay]

 Why does Cygwin do such wierd stuff with the top of the stack?
 Is this to have thread locals faster than TlsGetValue offers?
 Is it worth it?
 (The cost: harder to LoadLibrary(cygwin1.dll), harder to port to other architectures,
  the strange path where DllMain "respawns", etc.)
 

 - Jay

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