caio/clang-p2996
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[OpenMP] Use TLS for gtid on Solaris (#138508)

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When running the `openmp` testsuite on Solaris/amd64, many tests `FAIL`
like

```
# | OMP: Error #11: Stack overflow detected for OpenMP thread #1
```

In a `Debug` build, I also get
```
# | Assertion failure at kmp_runtime.cpp(203): __kmp_gtid_get_specific() < 0 || __kmp_gtid_get_specific() == i.
```

Further investigation shows that just setting `__kmp_gtid_mode` to 3
massively reduces the number of failures.

Tested on `amd64-pc-solaris2.11` and `x86_64-pc-linux-gnu`.
This commit is contained in:
Rainer Orth
2025-05-06 09:11:43 +02:00
committed by GitHub
parent ca59a2b868
commit d83983999d
1 changed files with 1 additions and 1 deletions
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2
openmp/runtime/src/kmp_global.cpp
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@@ -172,7 +172,7 @@ int __kmp_ncores = 0;
int __kmp_chunk = 0;
int __kmp_force_monotonic = 0;
int __kmp_abort_delay = 0;
#if (KMP_OS_LINUX || KMP_OS_AIX) && defined(KMP_TDATA_GTID)
#if (KMP_OS_LINUX || KMP_OS_AIX || KMP_OS_SOLARIS) && defined(KMP_TDATA_GTID)
int __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
int __kmp_adjust_gtid_mode = FALSE;
#elif KMP_OS_WINDOWS