How to return a value from pthread threads in C?

Question

I\'am new to C and would like to play with threads a bit. I would like to return some value from a thread using pthread_exit()

My code is as follows:

Answer 1

Here is a correct solution. In this case tdata is allocated in the main thread, and there is a space for the thread to place its result.

#include 
#include 

typedef struct thread_data {
   int a;
   int b;
   int result;

} thread_data;

void *myThread(void *arg)
{
   thread_data *tdata=(thread_data *)arg;

   int a=tdata->a;
   int b=tdata->b;
   int result=a+b;

   tdata->result=result;
   pthread_exit(NULL);
}

int main()
{
   pthread_t tid;
   thread_data tdata;

   tdata.a=10;
   tdata.b=32;

   pthread_create(&tid, NULL, myThread, (void *)&tdata);
   pthread_join(tid, NULL);

   printf("%d + %d = %d\n", tdata.a, tdata.b, tdata.result);   

   return 0;
}