[Octave-bug-tracker] [bug #58800] BIST for rng sometimes fails

[Hg200]

Follow-up Comment #2, bug #58800 (project octave):

The documentation is a bit vague about 'rng ("shuffle")' and 'rand ("state",
"reset")': 'By default, the generator is initialized from /dev/urandom if it
is available, otherwise from CPU time, wall clock time, and the current
fraction of a second.'

In deed on my linux system 'rng ("shuffle")' forces a read from urandom in
'randmtzig.cc':

++
void init_mersenne_twister (void)
    FILE *urandom = std::fopen ("/dev/urandom", "rb");
    if (urandom)
--

I don't know what is happening on Win. Probably there is no urandom and then
entropy is gathered from the clock. But i can't influence this. This is hard -
C code. Only idea i have is to add a 'pause()' into the BIST.


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