Introduce base::WeakPtr<T> and base::ThreadChecker
Looks like we are going to use elsewhere too.
Simple yet effective implementation that leverages a shared_ptr.
Also refactor unix_socket to use that and get rid of its own ad-hoc
WeakPtr.
Test: base_unittests --gtest_filter=WeakPtrTest.*
Change-Id: I4cf31e39b7cb3596ad8ec7ed105b62a74f745ee5
diff --git a/base/thread_checker.h b/base/thread_checker.h
new file mode 100644
index 0000000..760118e
--- /dev/null
+++ b/base/thread_checker.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PERFETTO_BASE_THREAD_CHECKER_H_
+#define PERFETTO_BASE_THREAD_CHECKER_H_
+
+#include <pthread.h>
+#include <atomic>
+
+#include "base/logging.h"
+
+namespace perfetto {
+namespace base {
+
+class ThreadChecker {
+ public:
+ ThreadChecker();
+ ~ThreadChecker();
+ ThreadChecker(const ThreadChecker&);
+ ThreadChecker& operator=(const ThreadChecker&);
+ bool CalledOnValidThread() const __attribute__((warn_unused_result));
+ void DetachFromThread();
+
+ private:
+ mutable std::atomic<pthread_t> thread_id_;
+};
+
+#if PERFETTO_DCHECK_IS_ON()
+#define PERFETTO_THREAD_CHECKER(name) base::ThreadChecker name
+#define PERFETTO_DCHECK_THREAD(name) \
+ PERFETTO_DCHECK((name).CalledOnValidThread())
+#define PERFETTO_DETACH_FROM_THREAD(name) (name).DetachFromThread()
+#else
+#define PERFETTO_THREAD_CHECKER(name)
+#define PERFETTO_DCHECK_THREAD(name)
+#define PERFETTO_DETACH_FROM_THREAD(name)
+#endif // PERFETTO_DCHECK_IS_ON()
+
+} // namespace base
+} // namespace perfetto
+
+#endif // PERFETTO_BASE_THREAD_CHECKER_H_