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STL std::random_shuffle behavior fails with lrand48
- From: Jim Kleckner <jek-cygwin at kleckner dot net>
- To: cygwin at cygwin dot com
- Date: Fri, 30 Jul 2004 18:01:24 -0700
- Subject: STL std::random_shuffle behavior fails with lrand48
Attached is a simple test case of std::random_shuffle() that
gives different answers on cygwin and RH Linux. Note that
the output looks like a simple circular rotation on cygwin
but works correctly on RH 7.2. The problem appears to be
the implementation of lrand48(). If you undefine:
#undef _GLIBCPP_HAVE_DRAND48
then it works consistently.
On cygwin output is:
changes before:
0 1 2 3 4 5 6
changes after:
6 0 1 2 3 4 5
changes after:
5 6 0 1 2 3 4
changes after:
4 5 6 0 1 2 3
========
on RH7.2 output is:
changes before:
0 1 2 3 4 5 6
changes after:
1 4 2 3 5 6 0
changes after:
0 6 2 1 4 5 3
changes after:
0 1 3 6 5 4 2
=========
Version of cygwin is current (see attached file
for all version stamps)
gcc 3.3.1-3
gcc-g++ 3.3.1-3
version of gcc/g++ on Linux is 2.96.
The test program is attached as is cygcheck output.
To run it just type (note that -mno-cygwin is *not* used):
g++ xxx.cpp
./a.exe
Is this a configuration issue? Or does lrand48 not work?
Or is it a long vs. int type mismatch?
Jim
Cygwin Configuration Diagnostics
Current System Time: Fri Jul 30 16:30:23 2004
Windows XP Professional Ver 5.1 Build 2600 Service Pack 1
Path: C:\cygwin\usr\local\bin
C:\cygwin\bin
C:\cygwin\usr\X11R6\bin
c:\WINDOWS\system32
c:\WINDOWS
c:\WINDOWS\System32\Wbem
c:\WinUnix\vim\vim63b
c:\jim\bin
c:\java\j2sdk14\bin
c:\Program Files\Common Files\GTK\2.0\bin
Output from C:\cygwin\bin\id.exe (nontsec)
UID: 1005(jim) GID: 513(None)
513(None) 545(Users)
Output from C:\cygwin\bin\id.exe (ntsec)
UID: 1005(jim) GID: 513(None)
0(root) 513(None)
544(Administrators) 545(Users)
SysDir: C:\WINDOWS\System32
WinDir: C:\WINDOWS
CYGWIN = `ntsec'
HOME = `c:\Jim'
PWD = `/cygdrive/c/Jim/Consult/VMI/Programs'
Use `-r' to scan registry
c: hd NTFS 57215Mb 95% CP CS UN PA FC
e: cd CDFS 589Mb 100% CS UN TOPO_US_EAST
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. /cygdrive system binmode,cygdrive
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Cygwin DLL version info:
DLL version: 1.5.10
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 116
Shared data: 4
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Tue May 25 22:07:00 EDT 2004
CVS tag: cr-0x5e6
Shared id: cygwin1S4
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Use -h to see help about each section
#include <stdlib.h>
#include <stdio.h>
#include <vector>
// Uncomment the next line to use the lesser strength rand() implementation
//#undef _GLIBCPP_HAVE_DRAND48
#include <algorithm>
int
main(int argc, char** argv)
{
std::vector<double> changes;
changes.push_back(0.0);
changes.push_back(1.0);
changes.push_back(2.0);
changes.push_back(3.0);
changes.push_back(4.0);
changes.push_back(5.0);
changes.push_back(6.0);
// Now construct random draws and compute the randomized bars
// in a "consistent" way.
printf("\nchanges before:\n");
for (unsigned int i = 0; i < changes.size(); i++) {
printf("%g ", changes[i]);
}
std::random_shuffle(changes.begin(), changes.end());
printf("\nchanges after:\n");
for (unsigned int i = 0; i < changes.size(); i++) {
printf("%g ", changes[i]);
}
std::random_shuffle(changes.begin(), changes.end());
printf("\nchanges after:\n");
for (unsigned int i = 0; i < changes.size(); i++) {
printf("%g ", changes[i]);
}
std::random_shuffle(changes.begin(), changes.end());
printf("\nchanges after:\n");
for (unsigned int i = 0; i < changes.size(); i++) {
printf("%g ", changes[i]);
}
return 0;
}
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