[VCRUNTIME] Add initialization / cleanup of wine code

sdk/lib/vcruntime/__vcrt_init.c

@@ -8,29 +8,64 @@
 // SPDX-License-Identifier: MIT
 //
 
-#include <vcruntime_startup.h>
+#include <internal_shared.h>
+
+void msvcrt_init_exception(HINSTANCE hinstDLL);
+BOOL msvcrt_init_tls(void);
+void msvcrt_free_tls_mem(void);
+BOOL msvcrt_free_tls(void);
 
 __vcrt_bool __cdecl __vcrt_initialize(void)
 {
-    return 1;
+    msvcrt_init_exception(GetModuleHandle(NULL));
+
+    if (!msvcrt_init_tls())
+        return FALSE;
+
+    return TRUE;
 }
 
 __vcrt_bool __cdecl __vcrt_uninitialize(_In_ __vcrt_bool _Terminating)
 {
-    return 1;
+    if (!msvcrt_free_tls())
+        return FALSE;
+
+    return TRUE;
 }
 
 __vcrt_bool __cdecl __vcrt_uninitialize_critical(void)
 {
-    return 1;
+    return TRUE;
 }
 
 __vcrt_bool __cdecl __vcrt_thread_attach(void)
 {
-    return 1;
+    // Not called by UCRT
+    return TRUE;
 }
 
 __vcrt_bool __cdecl __vcrt_thread_detach(void)
 {
-    return 1;
+    // Not called by UCRT
+    return TRUE;
 }
+
+// UCRT doesn't have a thread detach callback for the vcruntime TLS, because
+// the native vcruntime uses FlsAlloc and provides a cleanup callback there.
+// Since we don't have that, we use TLS callbacks.
+const IMAGE_TLS_DIRECTORY* __p_tls_used = &_tls_used;
+
+static
+VOID
+WINAPI
+wine_tls_cleanup_callback(PVOID hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+{
+    // For the last thread, only DLL_PROCESS_DETACH is called
+    if ((fdwReason == DLL_THREAD_DETACH) ||
+        (fdwReason == DLL_PROCESS_DETACH))
+    {
+        msvcrt_free_tls_mem();
+    }
+}
+
+_CRTALLOC(".CRT$XLD") PIMAGE_TLS_CALLBACK wine_tls_cleanup_ptr = wine_tls_cleanup_callback;