23 static AtExitManager* g_top_manager = nullptr;  variable
28     : processing_callbacks_(false), next_manager_(g_top_manager) {  in AtExitManager()
32   DCHECK(!g_top_manager);  in AtExitManager()
34   g_top_manager = this;  in AtExitManager()
38   if (!g_top_manager) {  in ~AtExitManager()
42   DCHECK_EQ(this, g_top_manager);  in ~AtExitManager()
46   g_top_manager = next_manager_;  in ~AtExitManager()
57   if (!g_top_manager) {  in RegisterTask()
62   AutoLock lock(g_top_manager->lock_);  in RegisterTask()
63   DCHECK(!g_top_manager->processing_callbacks_);  in RegisterTask()
64   g_top_manager->stack_.push(std::move(task));  in RegisterTask()
69   if (!g_top_manager) {  in ProcessCallbacksNow()
79     AutoLock lock(g_top_manager->lock_);  in ProcessCallbacksNow()
80     tasks.swap(g_top_manager->stack_);  in ProcessCallbacksNow()
81     g_top_manager->processing_callbacks_ = true;  in ProcessCallbacksNow()
95   DCHECK(g_top_manager->stack_.empty());  in ProcessCallbacksNow()
99   AutoLock lock(g_top_manager->lock_);  in DisableAllAtExitManagers()
104     : processing_callbacks_(false), next_manager_(g_top_manager) {  in AtExitManager()
105   DCHECK(shadow || !g_top_manager);  in AtExitManager()
106   g_top_manager = this;  in AtExitManager()