From 12be02b42fc24cf7bd990d56da8cf8908a35db2d Mon Sep 17 00:00:00 2001
From: babenko <babenko@yandex-team.com>
Date: Mon, 15 Jun 2026 11:13:32 +0300
Subject: Make library/cpp/yt/rseq a Linux-only dependency of
 library/cpp/yt/system

Make library/cpp/yt/rseq a Linux-only dependency of library/cpp/yt/system
commit_hash:7d6f5e738658447529440425b55b2891f6664d81
---
 library/cpp/yt/rseq/ya.make        |  4 ++++
 library/cpp/yt/system/cpu_id-inl.h |  2 ++
 library/cpp/yt/system/cpu_id.cpp   | 23 ++++++++---------------
 library/cpp/yt/system/ya.make      |  7 ++++++-
 4 files changed, 20 insertions(+), 16 deletions(-)

(limited to 'library/cpp')

diff --git a/library/cpp/yt/rseq/ya.make b/library/cpp/yt/rseq/ya.make
index cb233c52fbb..f0f55e17f49 100644
--- a/library/cpp/yt/rseq/ya.make
+++ b/library/cpp/yt/rseq/ya.make
@@ -2,6 +2,10 @@ LIBRARY()
 
 INCLUDE(${ARCADIA_ROOT}/library/cpp/yt/ya_cpp.make.inc)
 
+IF (NOT OS_LINUX)
+    MESSAGE(FATAL_ERROR "library/cpp/yt/rseq is Linux-only")
+ENDIF()
+
 SRCS(
     rseq.cpp
 )
diff --git a/library/cpp/yt/system/cpu_id-inl.h b/library/cpp/yt/system/cpu_id-inl.h
index af3ed0d7ab4..e336ba5a2ce 100644
--- a/library/cpp/yt/system/cpu_id-inl.h
+++ b/library/cpp/yt/system/cpu_id-inl.h
@@ -5,7 +5,9 @@
 #endif
 #undef CPU_ID_INL_H_
 
+#ifdef __linux__
 #include <library/cpp/yt/rseq/rseq.h>
+#endif
 
 #include <util/system/compiler.h>
 
diff --git a/library/cpp/yt/system/cpu_id.cpp b/library/cpp/yt/system/cpu_id.cpp
index d4cccc21ee1..9f6e46c9fc9 100644
--- a/library/cpp/yt/system/cpu_id.cpp
+++ b/library/cpp/yt/system/cpu_id.cpp
@@ -1,10 +1,10 @@
 #include "cpu_id.h"
 
-#include <library/cpp/yt/rseq/rseq.h>
-
 #include <library/cpp/yt/misc/tls.h>
 
-#if defined(__linux__)
+#ifdef __linux__
+#include <library/cpp/yt/rseq/rseq.h>
+
 #include <sched.h>
 #endif
 
@@ -12,33 +12,26 @@ namespace NYT::NDetail {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#ifdef YT_RSEQ_AVAILABLE
+#ifdef __linux__
 
 YT_PREVENT_TLS_CACHING int GetCurrentCpuIdSlow()
 {
+#ifdef YT_RSEQ_AVAILABLE
     if (NRseq::EnsureCurrentThreadRegistered()) {
         auto cpuId = NRseq::ReadField<int>(NRseq::CpuIdFieldOffset);
         if (cpuId >= 0) {
             return cpuId;
         }
     }
-
-    auto cpuId = ::sched_getcpu();
-    return cpuId >= 0 ? cpuId : 0;
-}
-
-#elif defined(__linux__)
-
-// Linux without a known fast path (e.g. an unsupported arch): use sched_getcpu.
-int GetCurrentCpuIdSlow()
-{
+#endif
+    // No rseq fast path (unsupported arch, or thread not registered): sched_getcpu.
     auto cpuId = ::sched_getcpu();
     return cpuId >= 0 ? cpuId : 0;
 }
 
 #else
 
-// No rseq and no sched_getcpu (darwin / windows): sharding degenerates to one shard.
+// No sched_getcpu (darwin / windows): sharding degenerates to one shard.
 int GetCurrentCpuIdSlow()
 {
     return 0;
diff --git a/library/cpp/yt/system/ya.make b/library/cpp/yt/system/ya.make
index 772cbaba788..aca2f0dcdf6 100644
--- a/library/cpp/yt/system/ya.make
+++ b/library/cpp/yt/system/ya.make
@@ -15,9 +15,14 @@ PEERDIR(
     library/cpp/yt/cpu_clock
     library/cpp/yt/exception
     library/cpp/yt/misc
-    library/cpp/yt/rseq
 )
 
+IF (OS_LINUX)
+    PEERDIR(
+        library/cpp/yt/rseq
+    )
+ENDIF()
+
 END()
 
 RECURSE(
-- 
cgit v1.3