Re: test-pthread-rwlock failure on Pop!_OS 22.04 LTS

[Bruno Haible]

Pádraig Brady wrote:
> FYI coreutils CI started failing with this on cfarm13.cfarm.net (debian 11.9) 
> with:
> 
> FAIL: test-pthread-rwlock-waitqueue
> ===================================
> test-pthread-rwlock-waitqueue.c:234: assertion 'startswith (do_test 
> ("RRRRR"), " R1 R2 R3 R4 R5")' failed
> FAIL test-pthread-rwlock-waitqueue (exit status: 134)

I can't reproduce it on that machine, even in 100 runs. Probably the machine
was under load while your CI was running.

Let me avoid the (optimistic) 5 ms interval. This makes the test run for a
longer time, but that is less of a problem than a failing test.

Thanks for the report.


2024-08-09  Bruno Haible  <br...@clisp.org>

        pthread-rwlock: Attempt to avoid test failure on some machines.
        Reported by Pádraig Brady <p...@draigbrady.com> in
        <https://lists.gnu.org/archive/html/bug-gnulib/2024-08/msg00050.html>.
        * tests/test-pthread-rwlock-waitqueue.c (STEP_INTERVAL): Bump the
        minimum interval to 10 ms.
        * m4/pthread-rwlock.m4 (gl_PTHREAD_RWLOCK): Likewise.

diff --git a/m4/pthread-rwlock.m4 b/m4/pthread-rwlock.m4
index cbd08790e1..0e203606a1 100644
--- a/m4/pthread-rwlock.m4
+++ b/m4/pthread-rwlock.m4
@@ -1,5 +1,5 @@
 # pthread-rwlock.m4
-# serial 6
+# serial 7
 dnl Copyright (C) 2019-2024 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -127,10 +127,8 @@ AC_DEFUN([gl_PTHREAD_RWLOCK]
 
 #if defined __hppa
 # define STEP_INTERVAL 20000000 /* nanoseconds */
-#elif defined __aarch64__ || defined __m68k__
-# define STEP_INTERVAL 10000000 /* nanoseconds */
 #else
-# define STEP_INTERVAL 5000000 /* nanoseconds */
+# define STEP_INTERVAL 10000000 /* nanoseconds */
 #endif
 
 static pthread_rwlock_t lock;
diff --git a/tests/test-pthread-rwlock-waitqueue.c 
b/tests/test-pthread-rwlock-waitqueue.c
index 9dc4a4e808..b7df033c90 100644
--- a/tests/test-pthread-rwlock-waitqueue.c
+++ b/tests/test-pthread-rwlock-waitqueue.c
@@ -55,11 +55,8 @@
 #elif (defined __FreeBSD__ || defined __DragonFly__) || (defined __linux__ && 
defined __hppa)
 /* FreeBSD, Linux/hppa */
 # define STEP_INTERVAL 20000000 /* nanoseconds */
-#elif defined __GNU__ || defined __sun || (defined __linux__ && (defined 
__aarch64__ || defined __m68k__))
-/* GNU/Hurd, Solaris, Linux/arm64, Linux/m68k */
-# define STEP_INTERVAL 10000000 /* nanoseconds */
 #else
-# define STEP_INTERVAL 5000000 /* nanoseconds */
+# define STEP_INTERVAL 10000000 /* nanoseconds */
 #endif
 
 static pthread_rwlock_t lock;