Googletest export

Replace the multiple implementations of Notification with a single
portable implementation.

The also removes the awkward loop with sleep in Notification and will
allow the removal of SleepMilliseconds.

PiperOrigin-RevId: 405399733

Author: derekmauro

googletest/include/gtest/internal/gtest-port.h

@@ -274,12 +274,14 @@
 # include <TargetConditionals.h>
 #endif
 
-#include <iostream>  // NOLINT
+#include <condition_variable>  // NOLINT
+#include <iostream>
 #include <locale>
 #include <memory>
-#include <string>  // NOLINT
+#include <mutex>  // NOLINT
+#include <string>
 #include <tuple>
-#include <vector>  // NOLINT
+#include <vector>
 
 #include "gtest/internal/custom/gtest-port.h"
 #include "gtest/internal/gtest-port-arch.h"
@@ -1172,58 +1174,8 @@ inline void SleepMilliseconds(int n) {
   };
   nanosleep(&time, nullptr);
 }
-# endif  // GTEST_HAS_PTHREAD
-
-# if GTEST_HAS_NOTIFICATION_
-// Notification has already been imported into the namespace.
-// Nothing to do here.
-
-# elif GTEST_HAS_PTHREAD
-// Allows a controller thread to pause execution of newly created
-// threads until notified.  Instances of this class must be created
-// and destroyed in the controller thread.
-//
-// This class is only for testing Google Test's own constructs. Do not
-// use it in user tests, either directly or indirectly.
-class Notification {
- public:
-  Notification() : notified_(false) {
-    GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_init(&mutex_, nullptr));
-  }
-  ~Notification() {
-    pthread_mutex_destroy(&mutex_);
-  }
-
-  // Notifies all threads created with this notification to start. Must
-  // be called from the controller thread.
-  void Notify() {
-    pthread_mutex_lock(&mutex_);
-    notified_ = true;
-    pthread_mutex_unlock(&mutex_);
-  }
-
-  // Blocks until the controller thread notifies. Must be called from a test
-  // thread.
-  void WaitForNotification() {
-    for (;;) {
-      pthread_mutex_lock(&mutex_);
-      const bool notified = notified_;
-      pthread_mutex_unlock(&mutex_);
-      if (notified)
-        break;
-      SleepMilliseconds(10);
-    }
-  }
-
- private:
-  pthread_mutex_t mutex_;
-  bool notified_;
-
-  GTEST_DISALLOW_COPY_AND_ASSIGN_(Notification);
-};
-
-# elif GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_PHONE && !GTEST_OS_WINDOWS_RT
 
+# elif GTEST_OS_WINDOWS
 GTEST_API_ void SleepMilliseconds(int n);
 
 // Provides leak-safe Windows kernel handle ownership.
@@ -1255,22 +1207,45 @@ class GTEST_API_ AutoHandle {
   GTEST_DISALLOW_COPY_AND_ASSIGN_(AutoHandle);
 };
 
+# endif
+
+# if GTEST_HAS_NOTIFICATION_
+// Notification has already been imported into the namespace.
+// Nothing to do here.
+
+# else
 // Allows a controller thread to pause execution of newly created
 // threads until notified.  Instances of this class must be created
 // and destroyed in the controller thread.
 //
 // This class is only for testing Google Test's own constructs. Do not
 // use it in user tests, either directly or indirectly.
+// TODO(b/203539622): Replace unconditionally with absl::Notification.
 class GTEST_API_ Notification {
  public:
-  Notification();
-  void Notify();
-  void WaitForNotification();
+  Notification() : notified_(false) {}
+  Notification(const Notification&) = delete;
+  Notification& operator=(const Notification&) = delete;
 
- private:
-  AutoHandle event_;
+  // Notifies all threads created with this notification to start. Must
+  // be called from the controller thread.
+  void Notify() {
+    std::lock_guard<std::mutex> lock(mu_);
+    notified_ = true;
+    cv_.notify_all();
+  }
 
-  GTEST_DISALLOW_COPY_AND_ASSIGN_(Notification);
+  // Blocks until the controller thread notifies. Must be called from a test
+  // thread.
+  void WaitForNotification() {
+    std::unique_lock<std::mutex> lock(mu_);
+    cv_.wait(lock, [this]() { return notified_; });
+  }
+
+ private:
+  std::mutex mu_;
+  std::condition_variable cv_;
+  bool notified_;
 };
 # endif  // GTEST_HAS_NOTIFICATION_
 

googletest/src/gtest-port.cc

@@ -322,23 +322,6 @@ bool AutoHandle::IsCloseable() const {
   return handle_ != nullptr && handle_ != INVALID_HANDLE_VALUE;
 }
 
-Notification::Notification()
-    : event_(::CreateEvent(nullptr,     // Default security attributes.
-                           TRUE,        // Do not reset automatically.
-                           FALSE,       // Initially unset.
-                           nullptr)) {  // Anonymous event.
-  GTEST_CHECK_(event_.Get() != nullptr);
-}
-
-void Notification::Notify() {
-  GTEST_CHECK_(::SetEvent(event_.Get()) != FALSE);
-}
-
-void Notification::WaitForNotification() {
-  GTEST_CHECK_(
-      ::WaitForSingleObject(event_.Get(), INFINITE) == WAIT_OBJECT_0);
-}
-
 Mutex::Mutex()
     : owner_thread_id_(0),
       type_(kDynamic),