[llvm] Add check for SYS_gettid support (PR #119742)
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Thu Dec 12 10:52:34 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-support
Author: Alexander Peskov (apeskov)
<details>
<summary>Changes</summary>
To improve compatibility with old glibc version which lack `syscall(SYS_gettid)` will use `pthread_self()` as a fallback.
---
Full diff: https://github.com/llvm/llvm-project/pull/119742.diff
1 Files Affected:
- (modified) llvm/lib/Support/Unix/Threading.inc (+1-1)
``````````diff
diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
index c7b4c7af3b9f33..368e3cf1c5bd8f 100644
--- a/llvm/lib/Support/Unix/Threading.inc
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -140,7 +140,7 @@ uint64_t llvm::get_threadid() {
return uint64_t(getthrid());
#elif defined(__ANDROID__)
return uint64_t(gettid());
-#elif defined(__linux__)
+#elif defined(__linux__) && defined(SYS_gettid)
return uint64_t(syscall(SYS_gettid));
#else
return uint64_t(pthread_self());
``````````
</details>
https://github.com/llvm/llvm-project/pull/119742
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