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tests: Reduce number of threads in once test under valgrind

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Valgrind has a limit of 500 threads (unless you pass `--max-threads` to
it). Running this test with more threads than that under valgrind seems
unnecessary, so reduce the thread limit when valgrind support is
enabled.

This should fix the following test failure:
```
Use --max-threads=INT to specify a larger number of threads
and rerun valgrind

valgrind: the 'impossible' happened:
   Max number of threads is too low

host stacktrace:
==5239==    at 0x580427EA: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x58042917: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x58042B80: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x58042BB0: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x58099C0E: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x580E6839: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x5809D3E9: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x58098DB2: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x5809AE97: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)
==5239==    by 0x580E40B0: ??? (in /usr/libexec/valgrind/memcheck-amd64-linux)

sched status:
  running_tid=1

Thread 1: status = VgTs_Runnable syscall 56 (lwpid 5239)
==5239==    at 0x4AB0315: clone (in /usr/lib64/libc-2.33.so)
client stack range: [0x1FFEFFB000 0x1FFF000FFF] client SP: 0x1FFEFFC468
valgrind stack range: [0x1008BAA000 0x1008CA9FFF] top usage: 8776 of 1048576

Thread 2: status = VgTs_WaitSys syscall 202 (lwpid 5268)
==5239==    at 0x4AAADDD: syscall (in /usr/lib64/libc-2.33.so)
==5239==    by 0x491E2C2: g_mutex_lock_slowpath (gthread-posix.c:1495)
==5239==    by 0x491E37C: g_mutex_lock (gthread-posix.c:1519)
==5239==    by 0x491E489: g_cond_wait (gthread-posix.c:1578)
==5239==    by 0x401436: once_thread_func (once.c:96)
==5239==    by 0x48E9F31: g_thread_proxy (gthread.c:829)
==5239==    by 0x491DE3A: linux_pthread_proxy (gthread-posix.c:1271)
==5239==    by 0x4C002A4: start_thread (in /usr/lib64/libpthread-2.33.so)
==5239==    by 0x4AB0322: clone (in /usr/lib64/libc-2.33.so)
client stack range: [0x5022000 0x5820FFF] client SP: 0x5820D28
valgrind stack range: [0x100B267000 0x100B366FFF] top usage: 3544 of 1048576
```

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #1910
This commit is contained in:
Philip Withnall 2022-06-07 09:22:56 +01:00
parent 2b437402e8
commit 5616e1b16e
1 changed files with 2 additions and 1 deletions
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3
glib/tests/once.c
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@ -22,8 +22,9 @@
*/
#include <glib.h>
#include "../gvalgrind.h"
#if GLIB_SIZEOF_VOID_P > 4
#if GLIB_SIZEOF_VOID_P > 4 && !defined(ENABLE_VALGRIND)
#define THREADS 1000
#else
#define THREADS 100