fix modify test

tile/base/thread/cond_var_test.cc

@@ -10,6 +10,7 @@
 namespace tile {
 
 class CondVarTest : public ::testing::Test {
+protected:
   void SetUp() override {
     m = new Mutex();
     cv = new CondVar();
@@ -18,24 +19,39 @@ class CondVarTest : public ::testing::Test {
   }
 
   void TearDown() override {
+    SetWorker(nullptr);
+    delete m;
+    delete cv;
+  }
+
+  void SetWorker(std::thread *new_worker) {
     if (worker) {
       if (worker->joinable()) {
         worker->join();
       }
       delete worker;
     }
-    delete m;
-    delete cv;
+    worker = new_worker;
   }
 
   void ResetEnv() {
+    is_started = false;
     is_set = false;
     is_timeout = false;
   }
 
+  void SetStarted() { is_started = true; }
+
+  void WaitStarted() {
+    while (!is_started) {
+      std::this_thread::sleep_for(std::chrono::milliseconds(1));
+    }
+  }
+
 protected:
   Mutex *m;
   CondVar *cv;
+  bool is_started;
   bool is_set;
   bool is_timeout;
   std::thread *worker;
@@ -73,6 +89,7 @@ TEST_F(CondVarTest, NotifyOne_WaitFor) {
   constexpr auto kWaitTimeout = std::chrono::milliseconds(50);
   auto WaitFor = [&] {
     UniqueLock<Mutex> inner_locker(*m);
+    SetStarted();
     if (cv->WaitFor(inner_locker, kWaitTimeout)) {
       is_set = true;
       cv->NotifyOne();
@@ -80,10 +97,11 @@ TEST_F(CondVarTest, NotifyOne_WaitFor) {
       is_timeout = true;
     }
   };
+
   {
 
-    std::thread t1(WaitFor);
-
+    SetWorker(new std::thread(WaitFor));
+    WaitStarted();
     std::this_thread::sleep_for(kWaitTimeout / 2);
     ASSERT_FALSE(is_set);
 
@@ -93,7 +111,7 @@ TEST_F(CondVarTest, NotifyOne_WaitFor) {
     }
 
     auto now = ReadSteadyClock();
-    t1.join();
+    worker->join();
     if (now - start > kWaitTimeout) {
       // timeout
       ASSERT_TRUE(is_timeout);
@@ -106,18 +124,15 @@ TEST_F(CondVarTest, NotifyOne_WaitFor) {
 
   // timeout
   {
-    std::thread t1(WaitFor);
-
+    ResetEnv();
+    SetWorker(new std::thread(WaitFor));
     {
       UniqueLock<Mutex> locker(*m);
       ASSERT_FALSE(is_timeout);
-      std::this_thread::sleep_for(kWaitTimeout);
-      ASSERT_FALSE(is_timeout);
-      cv->NotifyOne();
     }
-
-    t1.join();
+    worker->join();
     ASSERT_TRUE(is_timeout);
+    ASSERT_FALSE(is_set);
   }
 }