Repo created

libs/base/thread.cpp

@@ -0,0 +1,119 @@
+#include "base/thread.hpp"
+
+#include "base/logging.hpp"
+
+#include "std/target_os.hpp"
+
+#include <chrono>
+#include <exception>
+
+#if defined(OMIM_OS_ANDROID)
+void AndroidThreadAttachToJVM();
+void AndroidThreadDetachFromJVM();
+#endif  // defined(OMIM_OS_ANDROID)
+
+namespace threads
+{
+namespace
+{
+/// Prepares worker thread and runs routine.
+void RunRoutine(std::shared_ptr<IRoutine> routine)
+{
+#if defined(OMIM_OS_ANDROID)
+  AndroidThreadAttachToJVM();
+#endif  // defined(OMIM_OS_ANDROID)
+
+  routine->Do();
+
+#if defined(OMIM_OS_ANDROID)
+  AndroidThreadDetachFromJVM();
+#endif  // defined(OMIM_OS_ANDROID)
+}
+}  // namespace
+
+/////////////////////////////////////////////////////////////////////
+// Thread wrapper implementation
+
+Thread::Thread() {}
+
+Thread::~Thread()
+{
+  // @todo (ygorshenin@): in general, it's not a good practice to
+  // implicitly detach thread since detached threads work in
+  // background, consume system resources and make it hard to reason
+  // about program. Thus, all places where Thread is instantiated
+  // should be fixed to explicitly detach thread.
+  if (m_thread.joinable())
+    m_thread.detach();
+}
+
+bool Thread::Create(std::unique_ptr<IRoutine> && routine)
+{
+  ASSERT(!m_routine, ("Current implementation doesn't allow to reuse thread"));
+  std::thread routineThread;
+  try
+  {
+    m_routine.reset(routine.release());
+    routineThread = std::thread(&RunRoutine, m_routine);
+  }
+  catch (std::exception & e)
+  {
+    LOG(LERROR, ("Thread creation failed with error:", e.what()));
+    m_routine.reset();
+    return false;
+  }
+  m_thread = std::move(routineThread);
+  return true;
+}
+
+void Thread::Cancel()
+{
+  if (!m_routine)
+    return;
+  m_routine->Cancel();
+  Join();
+  m_routine.reset();
+}
+
+void Thread::Join()
+{
+  if (m_thread.joinable())
+    m_thread.join();
+}
+
+IRoutine * Thread::GetRoutine()
+{
+  return m_routine.get();
+}
+
+void Sleep(size_t ms)
+{
+  std::this_thread::sleep_for(std::chrono::milliseconds(ms));
+}
+
+ThreadID GetCurrentThreadID()
+{
+  return std::this_thread::get_id();
+}
+
+/////////////////////////////////////////////////////////////////////
+// SimpleThread implementation
+
+void SimpleThread::ThreadFunc(std::function<void()> && fn)
+{
+#if defined(OMIM_OS_ANDROID)
+  AndroidThreadAttachToJVM();
+#endif  // defined(OMIM_OS_ANDROID)
+
+  fn();
+
+  // https://github.com/organicmaps/organicmaps/issues/9397
+  // https://github.com/organicmaps/organicmaps/issues/6139
+  // Manually clear function object to free possible captured data/resources/lambdas _inside_ Attach/Detach context.
+  fn = {};
+
+#if defined(OMIM_OS_ANDROID)
+  AndroidThreadDetachFromJVM();
+#endif  // defined(OMIM_OS_ANDROID)
+}
+}  // namespace threads