[Webkit-unassigned] [Bug 204398] [Win] Use thread_local to hold Ref<WTF::Thread> in the thread rather than using FLS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204398

--- Comment #14 from Fujii Hironori <Hironori.Fujii at sony.com> ---
Windows doesn't support dllexport of thread_local variable. So, it's unable to access thread_local variable on other DLL.

Compiler Error C2492 | Microsoft Docs
https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/compiler-error-c2492?redirectedfrom=MSDN&view=vs-2019

Windows uses init-exec model as default, and local-exec models if /GA switch is specified and it's a EXE.

without /GA

00007FF775A61324  mov         ecx,dword ptr [_tls_index (07FF775A68150h)]  
00007FF775A6132A  mov         rax,qword ptr gs:[58h]  
00007FF775A61333  mov         edx,104h  
00007FF775A61338  mov         rax,qword ptr [rax+rcx*8]  

with /GA

00007FF6D9431324  mov         rax,qword ptr gs:[58h]  
00007FF6D943132D  mov         edx,104h

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