TLS(Thread Local Storage)问题demo

#include                                                                            
#include                                                                              
#include                                                                              
#include                                                                               
using namespace std;                                                                          
thread_local unsigned int rage = 1;                                                         
//unsigned int rage = 1;                                                                        
mutex cout_mutex;                                                                             
                                                                                              
void increase_rage(const std::string& thread_name){                                           
  ++rage; // modifying outside a lock is okay; this is a thread-local variable                
  lock_guard lock(cout_mutex);                                                    
  cout << "Rage counter for " << thread_name << " = " << rage << " ,line = " <<__LINE__< lock(cout_mutex);                                                  
    cout << "Rage counter for main, rage =  " << rage << " ,line = " <<__LINE__<