Yes, by "loop through" I mean that
is 10,000. 389 is the lux factor passed to the TRandom1 class constructor. It determines the quality and time required to generate the random numbers.
Hello!
First of all, forgive me for bad English.
When I starts new thread (pthread_create), system allocates some memory for it (for example, for thread's stack). I wonder when does it deallocate this memory? The problem is that I have a program which sometimes creates new threads and sometimes... (3 Replies)
Hi all,
I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap... (3 Replies)
I have a scenario like the client has to search for the active server.There will be many servers.But not all server are active.And at a time not more than one server will be active.
The client will be in active state always i.e, it should always search for an active server until it gets one.I... (1 Reply)
Hi Experts
I need some help in static memory allocation in C. I have a program in which I declared 2 variables, one char array and one integer. I was little surprised to see the addresses of the variables.
First:
int x;
char a;
printf("%u %u\n', &x, a);
I got the addresses displayed... (2 Replies)
Hello Guys
I have a small confusion in the dynamic memory allocation concept.
If we declare a pointer say a char pointer, we need to allocate adequate memory space.
char* str = (char*)malloc(20*sizeof(char));
str = "This is a string";
But this will also work.
char* str = "This... (2 Replies)
When we dynamically allocate the memory say 100 integers say
int *x = new int(1000);
then does entire chunk of memory gets allocated at once after the completion of the statement?
I mean will the the concept of page fault come into picture over here? (3 Replies)
hello all..
i'm a beginner in shell scripting. I need to know what is really happening when we are creating a variable in shell scripting? how memory is allocated for that variable? (3 Replies)
hi
in the following code, how the memory is allocated for a1 which holds the values of a2 after cpy function call.
#include <stdio.h>
#include <string.h>
void cpy(char* d, const char* s){
while(*d++=*s++);
}
main(){
char* a1;
char* a2="done";
cpy(a1,a2);
... (3 Replies)
I am using ubuntu. I have written a program to calculate prime factors. it works perfectly fine till entered number is less than 9989 (or so ) but when one enters a number higher than that, for example 15000, it does not work. Can anyone guide me whats the problem ? although new codes are welcome,... (2 Replies)
Discussion started by: Abhishek_kumar
2 Replies
LEARN ABOUT MOJAVE
arc4random_uniform
ARC4RANDOM(3) BSD Library Functions Manual ARC4RANDOM(3)NAME
arc4random, arc4random_buf, arc4random_uniform -- random number generator
SYNOPSIS
#include <stdlib.h>
uint32_t
arc4random(void);
void
arc4random_buf(void *buf, size_t nbytes);
uint32_t
arc4random_uniform(uint32_t upper_bound);
DESCRIPTION
These functions use a cryptographic pseudo-random number generator to generate high quality random bytes very quickly. One data pool is used
for all consumers in a process, so that consumption under program flow can act as additional stirring. The subsystem is re-seeded from the
kernel random number subsystem on a regular basis, and also upon fork(2).
This family of functions provides higher quality random data than those described in rand(3), random(3), and rand48(3). They can be called
in almost all environments, including chroot(2), and their use is encouraged over all other standard library functions for random numbers.
arc4random() returns a single 32-bit value.
arc4random_buf() fills the region buf of length nbytes with random data.
arc4random_uniform() will return a single 32-bit value, uniformly distributed but less than upper_bound. This is recommended over construc-
tions like ``arc4random() % upper_bound'' as it avoids "modulo bias" when the upper bound is not a power of two. In the worst case, this
function may require multiple iterations to ensure uniformity.
RETURN VALUES
These functions are always successful, and no return value is reserved to indicate an error.
SEE ALSO rand(3), rand48(3), random(3), random(4)HISTORY
The original version of this random number generator used the RC4 (also known as ARC4) algorithm. In OS X 10.12 it was replaced with the
NIST-approved AES cipher, and it may be replaced again in the future as cryptographic techniques advance. A good mnemonic is ``A Replacement
Call for Random''.
BSD July 30, 2015 BSD