diff --git a/screen_ui.cpp b/screen_ui.cpp
index 0ee0ddc..b9aba80 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -19,8 +19,6 @@
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <linux/input.h>
-#include <pthread.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -171,8 +169,7 @@
       stage(-1),
       max_stage(-1),
       locale_(""),
-      rtl_locale_(false),
-      updateMutex(PTHREAD_MUTEX_INITIALIZER) {}
+      rtl_locale_(false) {}
 
 ScreenRecoveryUI::~ScreenRecoveryUI() {
   progress_thread_stopped_ = true;
@@ -368,7 +365,7 @@
     surfaces.emplace(name, std::unique_ptr<GRSurface, decltype(&free)>(text_image, &free));
   }
 
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   gr_color(0, 0, 0, 255);
   gr_clear();
 
@@ -400,7 +397,6 @@
   }
   // Update the whole screen.
   gr_flip();
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::CheckBackgroundTextImages() {
@@ -624,42 +620,42 @@
   double interval = 1.0 / kAnimationFps;
   while (!progress_thread_stopped_) {
     double start = now();
-    pthread_mutex_lock(&updateMutex);
-
     bool redraw = false;
+    {
+      std::lock_guard<std::mutex> lg(updateMutex);
 
-    // update the installation animation, if active
-    // skip this if we have a text overlay (too expensive to update)
-    if ((currentIcon == INSTALLING_UPDATE || currentIcon == ERASING) && !show_text) {
-      if (!intro_done) {
-        if (current_frame == intro_frames - 1) {
-          intro_done = true;
-          current_frame = 0;
+      // update the installation animation, if active
+      // skip this if we have a text overlay (too expensive to update)
+      if ((currentIcon == INSTALLING_UPDATE || currentIcon == ERASING) && !show_text) {
+        if (!intro_done) {
+          if (current_frame == intro_frames - 1) {
+            intro_done = true;
+            current_frame = 0;
+          } else {
+            ++current_frame;
+          }
         } else {
-          ++current_frame;
+          current_frame = (current_frame + 1) % loop_frames;
         }
-      } else {
-        current_frame = (current_frame + 1) % loop_frames;
-      }
 
-      redraw = true;
-    }
-
-    // move the progress bar forward on timed intervals, if configured
-    int duration = progressScopeDuration;
-    if (progressBarType == DETERMINATE && duration > 0) {
-      double elapsed = now() - progressScopeTime;
-      float p = 1.0 * elapsed / duration;
-      if (p > 1.0) p = 1.0;
-      if (p > progress) {
-        progress = p;
         redraw = true;
       }
+
+      // move the progress bar forward on timed intervals, if configured
+      int duration = progressScopeDuration;
+      if (progressBarType == DETERMINATE && duration > 0) {
+        double elapsed = now() - progressScopeTime;
+        float p = 1.0 * elapsed / duration;
+        if (p > 1.0) p = 1.0;
+        if (p > progress) {
+          progress = p;
+          redraw = true;
+        }
+      }
+
+      if (redraw) update_progress_locked();
     }
 
-    if (redraw) update_progress_locked();
-
-    pthread_mutex_unlock(&updateMutex);
     double end = now();
     // minimum of 20ms delay between frames
     double delay = interval - (end - start);
@@ -799,16 +795,14 @@
 }
 
 void ScreenRecoveryUI::SetBackground(Icon icon) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
 
   currentIcon = icon;
   update_screen_locked();
-
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::SetProgressType(ProgressType type) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (progressBarType != type) {
     progressBarType = type;
   }
@@ -816,11 +810,10 @@
   progressScopeSize = 0;
   progress = 0;
   update_progress_locked();
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::ShowProgress(float portion, float seconds) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   progressBarType = DETERMINATE;
   progressScopeStart += progressScopeSize;
   progressScopeSize = portion;
@@ -828,11 +821,10 @@
   progressScopeDuration = seconds;
   progress = 0;
   update_progress_locked();
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::SetProgress(float fraction) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (fraction < 0.0) fraction = 0.0;
   if (fraction > 1.0) fraction = 1.0;
   if (progressBarType == DETERMINATE && fraction > progress) {
@@ -844,14 +836,12 @@
       update_progress_locked();
     }
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::SetStage(int current, int max) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   stage = current;
   max_stage = max;
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
@@ -862,7 +852,7 @@
     fputs(str.c_str(), stdout);
   }
 
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
     for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
       if (*ptr == '\n' || text_col_ >= text_cols_) {
@@ -875,7 +865,6 @@
     text_[text_row_][text_col_] = '\0';
     update_screen_locked();
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::Print(const char* fmt, ...) {
@@ -893,23 +882,21 @@
 }
 
 void ScreenRecoveryUI::PutChar(char ch) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (ch != '\n') text_[text_row_][text_col_++] = ch;
   if (ch == '\n' || text_col_ >= text_cols_) {
     text_col_ = 0;
     ++text_row_;
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::ClearText() {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   text_col_ = 0;
   text_row_ = 0;
   for (size_t i = 0; i < text_rows_; ++i) {
     memset(text_[i], 0, text_cols_ + 1);
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::ShowFile(FILE* fp) {
@@ -986,17 +973,16 @@
 
 void ScreenRecoveryUI::StartMenu(const std::vector<std::string>& headers,
                                  const std::vector<std::string>& items, size_t initial_selection) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (text_rows_ > 0 && text_cols_ > 1) {
     menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_, text_cols_ - 1, headers, items,
                                    initial_selection);
     update_screen_locked();
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 int ScreenRecoveryUI::SelectMenu(int sel) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (menu_) {
     int old_sel = menu_->selection();
     sel = menu_->Select(sel);
@@ -1005,17 +991,15 @@
       update_screen_locked();
     }
   }
-  pthread_mutex_unlock(&updateMutex);
   return sel;
 }
 
 void ScreenRecoveryUI::EndMenu() {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (menu_) {
     menu_.reset();
     update_screen_locked();
   }
-  pthread_mutex_unlock(&updateMutex);
 }
 
 size_t ScreenRecoveryUI::ShowMenu(const std::vector<std::string>& headers,
@@ -1067,31 +1051,27 @@
 }
 
 bool ScreenRecoveryUI::IsTextVisible() {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   int visible = show_text;
-  pthread_mutex_unlock(&updateMutex);
   return visible;
 }
 
 bool ScreenRecoveryUI::WasTextEverVisible() {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   int ever_visible = show_text_ever;
-  pthread_mutex_unlock(&updateMutex);
   return ever_visible;
 }
 
 void ScreenRecoveryUI::ShowText(bool visible) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   show_text = visible;
   if (show_text) show_text_ever = true;
   update_screen_locked();
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::Redraw() {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   update_screen_locked();
-  pthread_mutex_unlock(&updateMutex);
 }
 
 void ScreenRecoveryUI::KeyLongPress(int) {
diff --git a/screen_ui.h b/screen_ui.h
index c360516..b76d470 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -17,7 +17,6 @@
 #ifndef RECOVERY_SCREEN_UI_H
 #define RECOVERY_SCREEN_UI_H
 
-#include <pthread.h>
 #include <stdio.h>
 
 #include <atomic>
@@ -192,7 +191,6 @@
   GRSurface* GetCurrentFrame() const;
   GRSurface* GetCurrentText() const;
 
-  static void* ProgressThreadStartRoutine(void* data);
   void ProgressThreadLoop();
 
   virtual void ShowFile(FILE*);
@@ -297,7 +295,7 @@
   std::string locale_;
   bool rtl_locale_;
 
-  pthread_mutex_t updateMutex;
+  std::mutex updateMutex;
 
  private:
   void SetLocale(const std::string&);
diff --git a/ui.cpp b/ui.cpp
index dbe77ae..51d7f12 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -18,8 +18,6 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <linux/input.h>
-#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -74,8 +72,6 @@
       touch_slot_(0),
       is_bootreason_recovery_ui_(false),
       screensaver_state_(ScreensaverState::DISABLED) {
-  pthread_mutex_init(&key_queue_mutex, nullptr);
-  pthread_cond_init(&key_queue_cond, nullptr);
   memset(key_pressed, 0, sizeof(key_pressed));
 }
 
@@ -341,25 +337,25 @@
   bool register_key = false;
   bool long_press = false;
 
-  pthread_mutex_lock(&key_queue_mutex);
-  key_pressed[key_code] = updown;
-  if (updown) {
-    ++key_down_count;
-    key_last_down = key_code;
-    key_long_press = false;
-
-    std::thread time_key_thread(&RecoveryUI::TimeKey, this, key_code, key_down_count);
-    time_key_thread.detach();
-  } else {
-    if (key_last_down == key_code) {
-      long_press = key_long_press;
-      register_key = true;
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    key_pressed[key_code] = updown;
+    if (updown) {
+      ++key_down_count;
+      key_last_down = key_code;
+      key_long_press = false;
+      std::thread time_key_thread(&RecoveryUI::TimeKey, this, key_code, key_down_count);
+      time_key_thread.detach();
+    } else {
+      if (key_last_down == key_code) {
+        long_press = key_long_press;
+        register_key = true;
+      }
+      key_last_down = -1;
     }
-    key_last_down = -1;
   }
-  bool reboot_enabled = enable_reboot;
-  pthread_mutex_unlock(&key_queue_mutex);
 
+  bool reboot_enabled = enable_reboot;
   if (register_key) {
     switch (CheckKey(key_code, long_press)) {
       case RecoveryUI::IGNORE:
@@ -388,44 +384,37 @@
 void RecoveryUI::TimeKey(int key_code, int count) {
   std::this_thread::sleep_for(750ms);  // 750 ms == "long"
   bool long_press = false;
-  pthread_mutex_lock(&key_queue_mutex);
-  if (key_last_down == key_code && key_down_count == count) {
-    long_press = key_long_press = true;
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    if (key_last_down == key_code && key_down_count == count) {
+      long_press = key_long_press = true;
+    }
   }
-  pthread_mutex_unlock(&key_queue_mutex);
   if (long_press) KeyLongPress(key_code);
 }
 
 void RecoveryUI::EnqueueKey(int key_code) {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
   const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
   if (key_queue_len < queue_max) {
     key_queue[key_queue_len++] = key_code;
-    pthread_cond_signal(&key_queue_cond);
+    key_queue_cond.notify_one();
   }
-  pthread_mutex_unlock(&key_queue_mutex);
 }
 
 int RecoveryUI::WaitKey() {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::unique_lock<std::mutex> lk(key_queue_mutex);
 
   // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
   // plugged in.
   do {
-    struct timeval now;
-    struct timespec timeout;
-    gettimeofday(&now, nullptr);
-    timeout.tv_sec = now.tv_sec;
-    timeout.tv_nsec = now.tv_usec * 1000;
-    timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;
-
-    int rc = 0;
-    while (key_queue_len == 0 && rc != ETIMEDOUT) {
-      rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, &timeout);
+    std::cv_status rc = std::cv_status::no_timeout;
+    while (key_queue_len == 0 && rc != std::cv_status::timeout) {
+      rc = key_queue_cond.wait_for(lk, std::chrono::seconds(UI_WAIT_KEY_TIMEOUT_SEC));
     }
 
     if (screensaver_state_ != ScreensaverState::DISABLED) {
-      if (rc == ETIMEDOUT) {
+      if (rc == std::cv_status::timeout) {
         // Lower the brightness level: NORMAL -> DIMMED; DIMMED -> OFF.
         if (screensaver_state_ == ScreensaverState::NORMAL) {
           if (android::base::WriteStringToFile(std::to_string(brightness_dimmed_value_),
@@ -464,7 +453,6 @@
     key = key_queue[0];
     memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
   }
-  pthread_mutex_unlock(&key_queue_mutex);
   return key;
 }
 
@@ -485,16 +473,14 @@
 }
 
 bool RecoveryUI::IsKeyPressed(int key) {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
   int pressed = key_pressed[key];
-  pthread_mutex_unlock(&key_queue_mutex);
   return pressed;
 }
 
 bool RecoveryUI::IsLongPress() {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
   bool result = key_long_press;
-  pthread_mutex_unlock(&key_queue_mutex);
   return result;
 }
 
@@ -511,15 +497,15 @@
 }
 
 void RecoveryUI::FlushKeys() {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
   key_queue_len = 0;
-  pthread_mutex_unlock(&key_queue_mutex);
 }
 
 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) {
-  pthread_mutex_lock(&key_queue_mutex);
-  key_long_press = false;
-  pthread_mutex_unlock(&key_queue_mutex);
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    key_long_press = false;
+  }
 
   // If we have power and volume up keys, that chord is the signal to toggle the text display.
   if (HasThreeButtons() || (HasPowerKey() && HasTouchScreen() && touch_screen_allowed_)) {
@@ -542,9 +528,7 @@
 
   // Press power seven times in a row to reboot.
   if (key == KEY_POWER) {
-    pthread_mutex_lock(&key_queue_mutex);
     bool reboot_enabled = enable_reboot;
-    pthread_mutex_unlock(&key_queue_mutex);
 
     if (reboot_enabled) {
       ++consecutive_power_keys;
@@ -564,7 +548,6 @@
 }
 
 void RecoveryUI::SetEnableReboot(bool enabled) {
-  pthread_mutex_lock(&key_queue_mutex);
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
   enable_reboot = enabled;
-  pthread_mutex_unlock(&key_queue_mutex);
 }
diff --git a/ui.h b/ui.h
index 75390d8..32e2809 100644
--- a/ui.h
+++ b/ui.h
@@ -18,10 +18,11 @@
 #define RECOVERY_UI_H
 
 #include <linux/input.h>  // KEY_MAX
-#include <pthread.h>
 
 #include <atomic>
+#include <condition_variable>
 #include <functional>
+#include <mutex>
 #include <string>
 #include <thread>
 #include <vector>
@@ -188,8 +189,8 @@
   bool InitScreensaver();
 
   // Key event input queue
-  pthread_mutex_t key_queue_mutex;
-  pthread_cond_t key_queue_cond;
+  std::mutex key_queue_mutex;
+  std::condition_variable key_queue_cond;
   int key_queue[256], key_queue_len;
   char key_pressed[KEY_MAX + 1];  // under key_queue_mutex
   int key_last_down;              // under key_queue_mutex
diff --git a/wear_ui.cpp b/wear_ui.cpp
index f4a8399..65c4aee 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -16,7 +16,6 @@
 
 #include "wear_ui.h"
 
-#include <pthread.h>
 #include <string.h>
 
 #include <string>
@@ -86,11 +85,10 @@
 
 void WearRecoveryUI::StartMenu(const std::vector<std::string>& headers,
                                const std::vector<std::string>& items, size_t initial_selection) {
-  pthread_mutex_lock(&updateMutex);
+  std::lock_guard<std::mutex> lg(updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
     menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_ - kMenuUnusableRows - 1,
                                    text_cols_ - 1, headers, items, initial_selection);
     update_screen_locked();
   }
-  pthread_mutex_unlock(&updateMutex);
 }