public inbox for libstdc++-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r12-5055] libstdc++: Make spurious std::random_device FAIL less likely
@ 2021-11-09 14:40 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2021-11-09 14:40 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:8d2d0a6c4391e462555db6d33b2cc00f3da0932f
commit r12-5055-g8d2d0a6c4391e462555db6d33b2cc00f3da0932f
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Nov 9 10:31:18 2021 +0000
libstdc++: Make spurious std::random_device FAIL less likely
It's possible that independent reads from /dev/random and /dev/urandom
could produce the same value by chance. Retry if that happens. The
chances of it happening twice are miniscule.
libstdc++-v3/ChangeLog:
* testsuite/26_numerics/random/random_device/cons/token.cc:
Retry if random devices produce the same value.
Diff:
---
libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
index d6ac3a37c64..07713e5c67f 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
@@ -42,7 +42,7 @@ test02()
#ifdef _GLIBCXX_USE_DEV_RANDOM
std::random_device x1("/dev/urandom");
std::random_device x2("/dev/random");
- VERIFY( x1() != x2() );
+ VERIFY( x1() != x2() || x1() != x2() );
#endif
}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-11-09 14:40 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-09 14:40 [gcc r12-5055] libstdc++: Make spurious std::random_device FAIL less likely Jonathan Wakely
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).