On Tue, Jan 11, 2011 at 11:50:14AM +0100, jdzstz - gmail dot com wrote:
>About all the problems with drand48, explained in:
> * http://www.cygwin.com/ml/cygwin/2010-12/msg00460.html
>
>Christopher Faylor fixed it in 20101229 snapshot:
>http://www.cygwin.com/snapshots/winsup-changelog-20101226-201
About drand48() (and erand48) returns only zeros and pthread
application problems, I send this mail to both cygwin and newlib
mailist.
I have compared Cygwin with FreeBSD function implementation:
=> In Cygwin newlib, srand48 and drand48 use "__rand48_seed" and
"__rand48_mult" that are defined
On Wed, Dec 29, 2010 at 03:47:42AM +0100, Jorge D?az wrote:
>I am working with cygwin environment (Cygwin 1.7.7 + Newlib 1.18)
>where drand48 function returns always zero values.
>
>The problem was reported in 2004 at cygwin mailist:
>1) http://cygwin.com/ml/cygwin/2004-11/msg00488.html
>2)
Thanks Igor, Dave and Teun!
I was missing the call to srand48(0); that "unlocked"
both drand48 and erand48. My code (at least the random
number part) is now working.
In case anyone else is trying to do something similar
a working snippet is below.
Thanks to everybody who took time to help!
Rober
On Fri, Nov 12, 2004 at 07:35:29PM +0100, Teun Burgers wrote:
>meadmaker1066-cyg
>>drand48 and erand48 return only 0.0 no matter how many times I call
>>them.
>
>Indeed. Calling srand48 to set the seed helps, but should not be
>necessary.
From the linux man page:
The srand48(), seed48()
Thanks for the prompt reply!
At 12:55 PM 11/12/2004 -0500, you wrote:
>If you're using C++, why use stdio functions?
The program has some modules from an older C program
and some from a C++ program. I just hadn't converted
all of the code. I left the headers in because in my
finished program I'd
[EMAIL PROTECTED] wrote:
drand48 and erand48 return only 0.0 no matter how many
times I call them.
Indeed. Calling srand48 to set the seed helps, but should
not be necessary.
Teun
#include
#include
int main(int argc, char *argv[])
{
int i;
srand48(0);
for (i = 0; i< 20; i++) {
> -Original Message-
> From: cygwin-owner On Behalf Of meadmaker1066-cyg
> Sent: 12 November 2004 15:42
> drand48 and erand48 return only 0.0 no matter how many
> times I call them. The code works fine on the Linux
> computers at school, and the compiler does not report
> any errors or war
On Fri, 12 Nov 2004, meadmaker1066-cyg wrote:
> drand48 and erand48 return only 0.0 no matter how many
> times I call them. The code works fine on the Linux
> computers at school, and the compiler does not report
> any errors or warnings.
> [anip]
>
> #include
> #include
>
> #include
9 matches
Mail list logo
