fix the problem that tls data cannot be read in destructor which is specified by pthread_key_create

src/bthread/key.cpp

@@ -233,9 +233,8 @@ void return_keytable(bthread_keytable_pool_t* pool, KeyTable* kt) {
     pool->free_keytables = kt;
 }
 
-static void cleanup_pthread() {
-    KeyTable* kt = tls_bls.keytable;
-    //TODO(zhujiashun): thread local storage not works in macos using clang
+static void cleanup_pthread(void* arg) {
+    KeyTable* kt = static_cast<KeyTable*>(arg);
     if (kt) {
         delete kt;
         // After deletion: tls may be set during deletion.
@@ -447,7 +446,7 @@ int bthread_setspecific(bthread_key_t key, void* data) {
         }
         if (!bthread::tls_ever_created_keytable) {
             bthread::tls_ever_created_keytable = true;
-            CHECK_EQ(0, butil::thread_atexit(bthread::cleanup_pthread));
+            CHECK_EQ(0, butil::thread_atexit(bthread::cleanup_pthread, kt));
         }
     }
     return kt->set_data(key, data);