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diff --git a/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld.h b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld.h
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+++ b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld.h
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+//===-- sanitizer_stoptheworld.h --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the StopTheWorld function which suspends the execution of the current
+// process and runs the user-supplied callback in the same address space.
+//
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_STOPTHEWORLD_H
+#define SANITIZER_STOPTHEWORLD_H
+
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_common.h"
+
+namespace __sanitizer {
+
+enum PtraceRegistersStatus {
+  REGISTERS_UNAVAILABLE_FATAL = -1,
+  REGISTERS_UNAVAILABLE = 0,
+  REGISTERS_AVAILABLE = 1
+};
+
+// Holds the list of suspended threads and provides an interface to dump their
+// register contexts.
+class SuspendedThreadsList {
+ public:
+  SuspendedThreadsList() = default;
+
+  // Can't declare pure virtual functions in sanitizer runtimes:
+  // __cxa_pure_virtual might be unavailable. Use UNIMPLEMENTED() instead.
+  virtual PtraceRegistersStatus GetRegistersAndSP(
+      uptr index, InternalMmapVector<uptr> *buffer, uptr *sp) const {
+    UNIMPLEMENTED();
+  }
+
+  virtual uptr ThreadCount() const { UNIMPLEMENTED(); }
+  virtual tid_t GetThreadID(uptr index) const { UNIMPLEMENTED(); }
+
+ protected:
+  ~SuspendedThreadsList() {}
+
+ private:
+  // Prohibit copy and assign.
+  SuspendedThreadsList(const SuspendedThreadsList &) = delete;
+  void operator=(const SuspendedThreadsList &) = delete;
+};
+
+typedef void (*StopTheWorldCallback)(
+    const SuspendedThreadsList &suspended_threads_list,
+    void *argument);
+
+// Suspend all threads in the current process and run the callback on the list
+// of suspended threads. This function will resume the threads before returning.
+// The callback should not call any libc functions. The callback must not call
+// exit() nor _exit() and instead return to the caller.
+// This function should NOT be called from multiple threads simultaneously.
+void StopTheWorld(StopTheWorldCallback callback, void *argument);
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_STOPTHEWORLD_H