align with bionic

Author: SchrodingerZhu

libc/src/__support/threads/thread.cpp

@@ -166,7 +166,7 @@ void call_atexit_callbacks(ThreadAttributes *attrib) {
   }
 }
 
-void call_atexit_callbacks() { call_atexit_callbacks(self.attrib); }
+extern "C" void __cxa_thread_finalize() { call_atexit_callbacks(self.attrib); }
 
 } // namespace internal
 

libc/src/stdlib/atexit.cpp

@@ -30,10 +30,6 @@ int __cxa_atexit(AtExitCallback *callback, void *payload, void *) {
 
 void __cxa_finalize(void *dso) {
   if (!dso) {
-    // cxa callback also need to handle local static destructors.
-    // see
-    // https://refspecs.linuxbase.org/LSB_4.0.0/LSB-Core-generic/LSB-Core-generic/baselib---cxa-finalize.html
-    internal::call_atexit_callbacks();
     call_exit_callbacks(atexit_callbacks);
     if (teardown_main_tls)
       teardown_main_tls();

libc/src/stdlib/exit.cpp

@@ -14,8 +14,12 @@
 namespace LIBC_NAMESPACE_DECL {
 
 extern "C" void __cxa_finalize(void *);
+extern "C" [[gnu::weak]] void __cxa_thread_finalize();
 
+// TODO: use recursive mutex to protect this routine.
 [[noreturn]] LLVM_LIBC_FUNCTION(void, exit, (int status)) {
+  if (__cxa_thread_finalize)
+    __cxa_thread_finalize();
   __cxa_finalize(nullptr);
   internal::exit(status);
 }