c++ - calculating time taken to create n threads -

i trying create 1000 threads can know how time taking create them. im using pthreads. im getting segmentation fault: 11. googling tells me might case of using memory doubt possible reason.

any pointers might reason ?

code:

int main(int argc , char *argv[]) {    int *i;          // matti's answer below:  ... = (int*)malloc(sizeof(int));    *i = 0;    while( *i < 100)    {      pthread_t thread_id;      puts("connection accepted");      if( pthread_create( &thread_id , null , connection_handler ,  (void*) &i) < 0)      {         error("could not create thread");         return 1;      }       //pthread_detach(thread_id);      *i = *i + 1;    }      return 0; }  void *connection_handler(void *i) {   sleep(1);   return 0; } 

your problem fact you're dereferencing pointer never initialized:

int *i; *i = 0; 

what's wrong int i;?