[gcc(refs/users/aoliva/heads/testme)] libstdc++-v3: testsuite: increase future/members/poll timing tolerance

[Alexandre Oliva]

https://gcc.gnu.org/g:655e5e878ecd84d4652c56e2a165164951eac29c

commit 655e5e878ecd84d4652c56e2a165164951eac29c
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu May 8 02:18:44 2025 -0300

    libstdc++-v3: testsuite: increase future/members/poll timing tolerance
    
    In 30_threads/future/members/poll.c, despite the calibration and the
    large tolerance, wait_until_sys_min has occasionally come up to almost
    320 times as long as ready.  Tolerate that much measurement noise.
    
    
    for  libstdc++-v3/ChangeLog
    
            * testsuite/30_threads/future/members/poll.cc (main): Increase
            tolerance for measurement noise.

Diff:
---
 libstdc++-v3/testsuite/30_threads/future/members/poll.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/testsuite/30_threads/future/members/poll.cc b/libstdc++-v3/testsuite/30_threads/future/members/poll.cc
index 2113cfde70d6..cffe4a331da7 100644
--- a/libstdc++-v3/testsuite/30_threads/future/members/poll.cc
+++ b/libstdc++-v3/testsuite/30_threads/future/members/poll.cc
@@ -154,13 +154,13 @@ int main()
 
   // Polling before ready using wait_until(min) should not be terribly
   // slow.  We hope for no more than 100x slower, but a little over
-  // 100x has been observed, and since the measurements may have a lot
+  // 316x has been observed, and since the measurements may have a lot
   // of noise, and increasing the measurement precision through
   // additional iterations would make the test run for too long on
   // systems with very low clock precision (60Hz clocks are not
   // unheard of), we tolerate a lot of error.
-  VERIFY( wait_until_sys_min < (ready * 200) );
-  VERIFY( wait_until_steady_min < (ready * 200) );
+  VERIFY( wait_until_sys_min < (ready * 320) );
+  VERIFY( wait_until_steady_min < (ready * 320) );
 
   // The following two tests fail with GCC 11, see
   // https://gcc.gnu.org/pipermail/libstdc++/2020-November/051422.html