From 361764b7dd493c45eea4c7fd18b0184fe72b854a Mon Sep 17 00:00:00 2001
From: babenko <babenko@yandex-team.com>
Date: Sat, 14 Mar 2026 16:20:52 +0300
Subject: YT-18571: Extract and refactor execution stacks
 commit_hash:856b6638d9642f4711f5058d77bd58dd78accb8a

---
 library/cpp/yt/threading/execution_stack.cpp | 146 +++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 library/cpp/yt/threading/execution_stack.cpp

(limited to 'library/cpp/yt/threading/execution_stack.cpp')

diff --git a/library/cpp/yt/threading/execution_stack.cpp b/library/cpp/yt/threading/execution_stack.cpp
new file mode 100644
index 00000000000..35b3281fd4a
--- /dev/null
+++ b/library/cpp/yt/threading/execution_stack.cpp
@@ -0,0 +1,146 @@
+#include "execution_stack.h"
+
+#if defined(_unix_)
+#   include <sys/mman.h>
+#   include <limits.h>
+#   include <unistd.h>
+#   if !defined(__x86_64__) && !defined(__arm64__) && !defined(__aarch64__)
+#       error Unsupported platform
+#   endif
+#endif
+
+#include <library/cpp/yt/memory/ref.h>
+#include <library/cpp/yt/memory/ref_tracked.h>
+
+#include <library/cpp/yt/misc/tls.h>
+
+#include <library/cpp/yt/error/error.h>
+
+#include <library/cpp/yt/system/exit.h>
+
+namespace NYT::NThreading {
+
+////////////////////////////////////////////////////////////////////////////////
+
+TExecutionStackBase::TExecutionStackBase(size_t size)
+    : Size_(RoundUpToPage(size))
+{
+    auto cookie = GetRefCountedTypeCookie<TExecutionStack>();
+    TRefCountedTrackerFacade::AllocateInstance(cookie);
+    TRefCountedTrackerFacade::AllocateSpace(cookie, Size_);
+}
+
+TExecutionStackBase::~TExecutionStackBase()
+{
+    auto cookie = GetRefCountedTypeCookie<TExecutionStack>();
+    TRefCountedTrackerFacade::FreeInstance(cookie);
+    TRefCountedTrackerFacade::FreeSpace(cookie, Size_);
+}
+
+void* TExecutionStackBase::GetStack() const
+{
+    return Stack_;
+}
+
+size_t TExecutionStackBase::GetSize() const
+{
+    return Size_;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#if defined(_unix_)
+
+TExecutionStack::TExecutionStack(size_t size)
+    : TExecutionStackBase(size)
+{
+    size_t guardSize = GuardPageCount * GetPageSize();
+
+    int flags =
+#if defined(_darwin_)
+        MAP_ANON | MAP_PRIVATE;
+#else
+        MAP_ANONYMOUS | MAP_PRIVATE;
+#endif
+
+    Base_ = reinterpret_cast<char*>(::mmap(
+        0,
+        guardSize * 2 + Size_,
+        PROT_READ | PROT_WRITE,
+        flags,
+        -1,
+        0));
+
+    auto handleError = [&] {
+        AbortProcessDramatically(
+            EProcessExitCode::OutOfMemory,
+            Format("Error creating execution stack (Size: %v): %v",
+                Size_,
+                TError::FromSystem()));
+    };
+
+    if (Base_ == MAP_FAILED) {
+        handleError();
+    }
+
+    if (::mprotect(Base_, guardSize, PROT_NONE) == -1) {
+        handleError();
+    }
+
+    if (::mprotect(Base_ + guardSize + Size_, guardSize, PROT_NONE) == -1) {
+        handleError();
+    }
+
+    Stack_ = Base_ + guardSize;
+    YT_VERIFY((reinterpret_cast<uintptr_t>(Stack_) & 15) == 0);
+}
+
+TExecutionStack::~TExecutionStack()
+{
+    const size_t guardSize = GuardPageCount * GetPageSize();
+    ::munmap(Base_, guardSize * 2 + Size_);
+}
+
+#elif defined(_win_)
+
+TExecutionStack::TExecutionStack(size_t size)
+    : TExecutionStackBase(size)
+    , Handle_(::CreateFiber(Size_, &FiberTrampoline, this))
+{ }
+
+TExecutionStack::~TExecutionStack()
+{
+    ::DeleteFiber(Handle_);
+}
+
+YT_DEFINE_THREAD_LOCAL(void*, FiberTrampolineOpaque);
+
+void TExecutionStack::SetOpaque(void* opaque)
+{
+    FiberTrampolineOpaque() = opaque;
+}
+
+void* TExecutionStack::GetOpaque()
+{
+    return FiberTrampolineOpaque();
+}
+
+void TExecutionStack::SetTrampoline(void (*trampoline)(void*))
+{
+    YT_ASSERT(!Trampoline_);
+    Trampoline_ = trampoline;
+}
+
+VOID CALLBACK TExecutionStack::FiberTrampoline(PVOID opaque)
+{
+    auto* stack = reinterpret_cast<TExecutionStack*>(opaque);
+    stack->Trampoline_(FiberTrampolineOpaque());
+}
+
+#else
+#   error Unsupported platform
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT::NThreading
-- 
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