From 1499f10bc2c9a0fd483015adc3c312c473a04289 Mon Sep 17 00:00:00 2001
From: ShadiBahaa <shady3amalkwy@gmail.com>
Date: Mon, 13 Apr 2026 19:32:41 +0200
Subject: [PATCH] fix: add HaikuOS support for GetTID() in sysinfo.cc

Add a platform-specific GetTID() implementation for HaikuOS using
Haiku's native find_thread(NULL) API, which returns the current
thread's ID. Without this, HaikuOS falls through to the generic
pthread_self() fallback which causes a compilation failure due to
type incompatibility.

Fixes #1981
---
 absl/base/internal/sysinfo.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/absl/base/internal/sysinfo.cc b/absl/base/internal/sysinfo.cc
index a62dd31c2..92c4a1ce3 100644
--- a/absl/base/internal/sysinfo.cc
+++ b/absl/base/internal/sysinfo.cc
@@ -50,6 +50,10 @@
 #include <zircon/process.h>
 #endif
 
+#if defined(__HAIKU__)
+#include <OS.h>
+#endif
+
 #include <string.h>
 
 #include <cassert>
@@ -466,6 +470,10 @@ pid_t GetTID() {
   return static_cast<pid_t>(zx_thread_self());
 }
 
+#elif defined(__HAIKU__)
+
+pid_t GetTID() { return find_thread(NULL); }
+
 #else
 
 // Fallback implementation of `GetTID` using `pthread_self`.