Extremely poor performance crunching random numbers under PIV-FC5
Jakub Jelinek
jakub at redhat.com
Fri May 19 14:20:51 UTC 2006
On Fri, May 19, 2006 at 04:16:40PM +0200, BankHacker wrote:
> Jakub, I have tried to do what you propose but the following code is
> throwing an error in execution time:
>
> ### prueba-3.c ##################################################
> #include <stdio.h>
> #include <stdlib.h>
> #include <fcntl.h>
>
> int bucle_random_r() {
> int nRandom;
> struct random_data *randomdataState;
This is an uninitialized pointer:
> static int buf[32];
> time_t seconds;
> extern void *memset (void *__s, int __c, size_t __n) __THROW;
Don't do this ^^^, string.h provides prototype.
>
> memset(randomdataState, 0, sizeof(*randomdataState));
And you dereference the uninitialized pointer here ^^^.
Either have
struct random_data randomdataState;
and replace current uses of *randomdataState with randomdataState and
currnet uses of randomdataState with &randomdataState, or initialize
the pointer to an address of some struct random_data.
Jakub
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