* Windows TLS callbacks, call SysInitMultithreading early, it is necessary because if a statically loaded DLL creates a thread, apparently DLL_THREAD_ATTACH callback executes right away before the entry point. In turn, DLL_THREAD_ATTACH requires TLSIndex to be initialized.

git-svn-id: trunk@19693 -

rtl/win/syswin.inc

@@ -340,7 +340,13 @@ procedure Exec_Tls_callback(Handle : pointer; reason : Dword; Reserved : pointer
      case reason of
        { For executables, DLL_PROCESS_ATTACH is called *before* the entry point,
          and DLL_PROCESS_DETACH is called *after* RTL shuts down and calls ExitProcess.
-         It isn't a good idea to handle resources of the main thread at these points. }
+         It isn't a good idea to handle resources of the main thread at these points.
+         SysInitMultithreading is necessary however, because if some statically loaded
+         DLL creates a thread, it will invoke DLL_THREAD_ATTACH before anything else is
+         initialized. }
+       DLL_PROCESS_ATTACH:
+         SysInitMultithreading;
+
        DLL_THREAD_ATTACH :
          begin
          {  !!! SysInitMultithreading must NOT be called here. Windows guarantees that