diff --git a/tile/fiber/detail/fiber_benchmark.cc b/tile/fiber/detail/fiber_benchmark.cc
deleted file mode 100644
index 14f3fd4..0000000
--- a/tile/fiber/detail/fiber_benchmark.cc
+++ /dev/null
@@ -1,37 +0,0 @@
-#include "tile/fiber/detail/fiber.h"
-
-#include "tile/base/random.h"
-#include "tile/base/string.h"
-
-#include "benchmark/benchmark.h"
-
-namespace tile {
-namespace fiber {
-namespace detail {
-void Benchmark_FiberSwitch(benchmark::State &state) {
-  std::unique_ptr<Fiber> master_fiber;
-
-  int switch_cnt = 0;
-  master_fiber = Fiber::Create([&] {
-    while (state.KeepRunning()) {
-      std::unique_ptr<Fiber> worker_fiber1 =
-          Fiber::Create([&] { ++switch_cnt; });
-
-      auto start = std::chrono::steady_clock::now();
-      worker_fiber1->Resume();
-      auto end = std::chrono::steady_clock::now();
-      auto elapsed = std::chrono::duration_cast<std::chrono::duration<double>>(
-          end - start);
-      state.SetIterationTime(elapsed.count());
-    }
-  });
-
-  master_fiber->Resume();
-  state.counters["switch_cnt"] = switch_cnt;
-}
-
-} // namespace detail
-} // namespace fiber
-} // namespace tile
-
-BENCHMARK(tile::fiber::detail::Benchmark_FiberSwitch)->UseManualTime();
diff --git a/tile/fiber/detail/fiber_test.cc b/tile/fiber/detail/fiber_test.cc
deleted file mode 100644
index 2cf3c2d..0000000
--- a/tile/fiber/detail/fiber_test.cc
+++ /dev/null
@@ -1,52 +0,0 @@
-#include "tile/base/random.h"
-#include "tile/fiber/detail/fiber.h"
-
-#include "gtest/gtest.h"
-namespace tile {
-namespace fiber {
-namespace detail {
-
-TEST(Fiber, Base) {
-  constexpr auto kMaxCnt = 1; // 100 * 1000;
-  int cnt = 0;
-  int resume_cnt = 0;
-
-  // 0 -> master fiber
-  // [1, 9] -> worker fibers
-  std::unique_ptr<Fiber> master_fiber;
-
-  master_fiber = Fiber::Create([&] {
-    TILE_LOG_INFO("master fiber");
-    // ASSERT_EQ(cnt, 0);
-    ASSERT_EQ(GetMasterFiber(), master_fiber.get());
-    ASSERT_EQ(GetCurrentFiber(), master_fiber.get());
-
-    ASSERT_EQ(cnt, 0);
-    while (cnt < kMaxCnt) {
-      std::unique_ptr<Fiber> worker_fiber = Fiber::Create([&] {
-        while (cnt < kMaxCnt) {
-          ASSERT_EQ(GetCurrentFiber(), worker_fiber.get());
-          ++cnt;
-          master_fiber->Resume();
-        }
-      });
-
-      while (cnt < kMaxCnt) {
-        int old = cnt;
-        worker_fiber->Resume();
-        ASSERT_EQ(old + 1, cnt);
-        ASSERT_EQ(GetCurrentFiber(), master_fiber.get());
-      }
-    }
-
-    ASSERT_EQ(cnt, kMaxCnt);
-  });
-
-  SetUpMasterFiber(master_fiber.get());
-  SetUpCurrentFiber(nullptr);
-  master_fiber->Resume();
-}
-
-} // namespace detail
-} // namespace fiber
-} // namespace tile
diff --git a/tile/fiber/this_fiber.h b/tile/fiber/this_fiber.h
deleted file mode 100644
index ebecd8a..0000000
--- a/tile/fiber/this_fiber.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef TILE_FIBER_THIS_FIBER_H
-#define TILE_FIBER_THIS_FIBER_H
-
-#pragma once
-
-#include "tile/base/chrono.h"
-#include "tile/fiber/fiber.h"
-#include <chrono>
-
-namespace tile {
-namespace this_fiber {
-
-Fiber::Id GetId();
-
-void Yield();
-
-void SleepUntil(std::chrono::steady_clock expires_at);
-
-void SleepFor(std::chrono::nanoseconds expires_in);
-
-template <typename Clock, typename Duration>
-void SleepUntil(const std::chrono::time_point<Clock, Duration> &expires_at) {
-  return SleepUntil(ReadSteadyClock() + (expires_at - Clock::now()));
-}
-
-template <typename Rep, typename Period>
-void SleepFor(const std::chrono::duration<Rep, Period> &expires_in) {
-  return SleepFor(
-      std::chrono::duration_cast<std::chrono::nanoseconds>(expires_in));
-}
-
-} // namespace this_fiber
-} // namespace tile
-
-#endif // TILE_FIBER_THIS_FIBER_H