imprecise mark and sweep native memory leak detector
libmemunreachable uses an imprecise mark and sweep pass over all memory
allocated by jemalloc in order to find unreachable allocations.
Change-Id: Ia70bbf31f5b40ff71dab28cfd6cd06c5ef01a2d4
diff --git a/libmemunreachable/PtracerThread.h b/libmemunreachable/PtracerThread.h
new file mode 100644
index 0000000..4d6ca9a
--- /dev/null
+++ b/libmemunreachable/PtracerThread.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 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 LIBMEMUNREACHABLE_PTRACER_THREAD_H_
+#define LIBMEMUNREACHABLE_PTRACER_THREAD_H_
+
+#include <functional>
+#include <mutex>
+
+#include "android-base/macros.h"
+
+#include "Allocator.h"
+
+class Stack;
+
+// PtracerThread is similar to std::thread, except that it creates a "thread"
+// that can ptrace the other threads. The thread is actually a separate
+// process, with its own thread group, but shares address space and fds with
+// the parent.
+class PtracerThread {
+ public:
+ PtracerThread(const std::function<int()>& func);
+ ~PtracerThread();
+ bool Start();
+ int Join();
+ private:
+ void SetTracer(pid_t);
+ void ClearTracer();
+ void Kill();
+ DISALLOW_COPY_AND_ASSIGN(PtracerThread);
+ std::unique_ptr<Stack> stack_;
+ std::function<int()> func_;
+ std::mutex m_;
+ pid_t child_pid_;
+};
+
+#endif // LIBMEMUNREACHABLE_PTRACER_THREAD_H_