volatile and multithreading?

Question

In the following code:

#include 
#include 
#include 

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int          


        

Answer 1

I'd be surprised if the compiler assumes anything about a global variable in the presence of library function calls. That being said, volatile will not cost you anything, and it shows your intentions. I'd put it there.