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diff --git a/libsanitizer/tsan/tsan_flags.h b/libsanitizer/tsan/tsan_flags.h
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index 00000000000..a6310e3ce6c
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+++ b/libsanitizer/tsan/tsan_flags.h
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+//===-- tsan_flags.h --------------------------------------------*- C++ -*-===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer (TSan), a race detector.
+// NOTE: This file may be included into user code.
+//===----------------------------------------------------------------------===//
+
+#ifndef TSAN_FLAGS_H
+#define TSAN_FLAGS_H
+
+// ----------- ATTENTION -------------
+// ThreadSanitizer user may provide its implementation of weak
+// symbol __tsan::OverrideFlags(__tsan::Flags). Therefore, this
+// header may be included in the user code, and shouldn't include
+// other headers from TSan or common sanitizer runtime.
+
+namespace __tsan {
+
+struct Flags {
+  // Enable dynamic annotations, otherwise they are no-ops.
+  bool enable_annotations;
+  // Supress a race report if we've already output another race report
+  // with the same stack.
+  bool suppress_equal_stacks;
+  // Supress a race report if we've already output another race report
+  // on the same address.
+  bool suppress_equal_addresses;
+  // Report thread leaks at exit?
+  bool report_thread_leaks;
+  // Report destruction of a locked mutex?
+  bool report_destroy_locked;
+  // Report violations of async signal-safety
+  // (e.g. malloc() call from a signal handler).
+  bool report_signal_unsafe;
+  // If set, all atomics are effectively sequentially consistent (seq_cst),
+  // regardless of what user actually specified.
+  bool force_seq_cst_atomics;
+  // Strip that prefix from file paths in reports.
+  const char *strip_path_prefix;
+  // Suppressions filename.
+  const char *suppressions;
+  // Override exit status if something was reported.
+  int exitcode;
+  // Log fileno (1 - stdout, 2 - stderr).
+  int log_fileno;
+  // Sleep in main thread before exiting for that many ms
+  // (useful to catch "at exit" races).
+  int atexit_sleep_ms;
+  // Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).
+  int verbosity;
+  // If set, periodically write memory profile to that file.
+  const char *profile_memory;
+  // Flush shadow memory every X ms.
+  int flush_memory_ms;
+  // Stops on start until __tsan_resume() is called (for debugging).
+  bool stop_on_start;
+  // Controls whether RunningOnValgrind() returns true or false.
+  bool running_on_valgrind;
+  // Path to external symbolizer.
+  const char *external_symbolizer_path;
+};
+
+Flags *flags();
+void InitializeFlags(Flags *flags, const char *env);
+}
+
+#endif  // TSAN_FLAGS_H