Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
62 lines
1.0 KiB
C
62 lines
1.0 KiB
C
/*
|
|
random.c
|
|
-------------------
|
|
AUTHOR : Lionel GAUTHIER
|
|
COMPANY : EURECOM
|
|
EMAIL : Lionel.Gauthier@eurecom.fr
|
|
***************************************************************************/
|
|
#include "rtos_header.h"
|
|
#include "platform_types.h"
|
|
|
|
#ifdef USER_MODE
|
|
# include <sys/time.h>
|
|
#else
|
|
#include <rtai_sched.h>
|
|
#endif
|
|
|
|
|
|
/* Random generators */
|
|
#define FACTOR 16807
|
|
#define LASTXN 127773
|
|
#define UPTOMOD -2836
|
|
|
|
static int seed;
|
|
|
|
|
|
void
|
|
init_uniform (void)
|
|
{
|
|
#ifdef USER_MODE
|
|
struct timeval tv;
|
|
struct timezone tz;
|
|
|
|
gettimeofday (&tv, &tz);
|
|
seed = (int) tv.tv_usec;
|
|
#ifdef NODE_MT
|
|
#warning TO DO seed = mobileId
|
|
//seed += mobileId;
|
|
#endif
|
|
#ifdef NODE_RG
|
|
#warning TO DO seed = rgId
|
|
//seed += rgId;
|
|
#endif
|
|
#else
|
|
seed = rt_get_time_ns();
|
|
#endif
|
|
}
|
|
|
|
|
|
int
|
|
uniform (void)
|
|
{
|
|
static int times, rest, prod1, prod2;
|
|
|
|
times = seed / LASTXN;
|
|
rest = seed - times * LASTXN;
|
|
prod1 = times * UPTOMOD;
|
|
prod2 = rest * FACTOR;
|
|
seed = prod1 + prod2;
|
|
|
|
return seed;
|
|
}
|