gistfile1.cpp

unsigned int counter = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

void* thread_method(void* parameter){
	string s = *(string*)(parameter);
	
	for(int i=0;i<4;i++){
		pthread_mutex_lock(&mutex);		
		counter++;
		cout<<s<<": "<<counter<<endl;
		pthread_mutex_unlock(&mutex);	
		
		// relinquish the CPU, give a chance to other thread
		pthread_yield();
	}	
}