[glibc] rt: skip nanosleep interval and abs test for low precision clocks

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c89d20dd5264957490edef3b7f6151e51c359d10

commit c89d20dd5264957490edef3b7f6151e51c359d10
Author: Mark Wielaard <[email protected]>
Date:   Tue Jan 14 01:30:40 2025 +0100

    rt: skip nanosleep interval and abs test for low precision clocks
    
    If a clock doesn't have enough precision to check the sleep resolution
    (quantum.tv_nsec > TEST_NSEC / 10) then record the quantum.tv_nsec,
    but skip the interval_test and abs_test for that clock.
    
    Reviewed-by: Adhemerval Zanella <[email protected]>
    Tested-by: Magnus Lindholm <[email protected]>

Diff:
---
 rt/tst-clock_nanosleep2.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/rt/tst-clock_nanosleep2.c b/rt/tst-clock_nanosleep2.c
index 0a34a273e8..18df0c2c8e 100644
--- a/rt/tst-clock_nanosleep2.c
+++ b/rt/tst-clock_nanosleep2.c
@@ -87,9 +87,14 @@ test_interval_1 (const char *n_clock, clockid_t t_clock)
   /* Arbitrary to ensure our time period is sufficiently bigger than
      the time step.  */
   TEST_VERIFY (clock_getres (t_clock, &quantum) == 0);
-  printf("Clock quantum: %lld ns, test time: %lld ns\n",
+  printf("%s quantum: %lld ns, test time: %lld ns\n", n_clock,
 	 (long long int) quantum.tv_nsec, (long long int) TEST_NSEC);
-  TEST_VERIFY (quantum.tv_nsec <= TEST_NSEC / 10);
+  if (quantum.tv_nsec > TEST_NSEC / 10)
+    {
+      printf ("SKIPPING test_interval for clock %s, not enough precision\n",
+	      n_clock);
+      return;
+    }
 
   min_slept = TEST_NSEC;
 
@@ -125,9 +130,14 @@ test_abs_1 (const char *n_clock, clockid_t t_clock)
   /* Arbitrary to ensure our time period is sufficiently bigger than
      the time step.  */
   TEST_VERIFY (clock_getres (t_clock, &quantum) == 0);
-  printf("Clock quantum: %lld ns, test time: %lld ns\n",
+  printf("%s quantum: %lld ns, test time: %lld ns\n", n_clock,
 	 (long long int) quantum.tv_nsec, (long long int) TEST_NSEC);
-  TEST_VERIFY (quantum.tv_nsec <= TEST_NSEC / 10);
+  if (quantum.tv_nsec > TEST_NSEC / 10)
+    {
+      printf ("SKIPPING test_abs for clock %s, not enough precision\n",
+	      n_clock);
+      return;
+    }
 
   me_sleep = make_timespec (0,  TEST_NSEC);