1 files changed, 62 insertions, 0 deletions
diff --git a/mozglue/baseprofiler/core/ThreadInfo.h b/mozglue/baseprofiler/core/ThreadInfo.h
new file mode 100644
index 0000000000..80211396ac
--- /dev/null
+++ b/mozglue/baseprofiler/core/ThreadInfo.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ThreadInfo_h
+#define ThreadInfo_h
+
+#include "mozilla/Atomics.h"
+#include "mozilla/BaseProfilerUtils.h"
+#include "mozilla/TimeStamp.h"
+
+namespace mozilla {
+namespace baseprofiler {
+
+// This class contains information about a thread which needs to be stored
+// across restarts of the profiler and which can be useful even after the
+// thread has stopped running.
+// It uses threadsafe refcounting and only contains immutable data.
+class ThreadInfo final {
+ public:
+  ThreadInfo(const char* aName, BaseProfilerThreadId aThreadId,
+             bool aIsMainThread,
+             const TimeStamp& aRegisterTime = TimeStamp::Now())
+      : mName(aName),
+        mRegisterTime(aRegisterTime),
+        mThreadId(aThreadId),
+        mIsMainThread(aIsMainThread),
+        mRefCnt(0) {
+    MOZ_ASSERT(aThreadId.IsSpecified(),
+               "Given aThreadId should not be unspecified");
+  }
+
+  // Using hand-rolled ref-counting, because RefCounted.h macros don't produce
+  // the same code between mozglue and libxul, see bug 1536656.
+  MFBT_API void AddRef() const { ++mRefCnt; }
+  MFBT_API void Release() const {
+    MOZ_ASSERT(int32_t(mRefCnt) > 0);
+    if (--mRefCnt == 0) {
+      delete this;
+    }
+  }
+
+  const char* Name() const { return mName.c_str(); }
+  TimeStamp RegisterTime() const { return mRegisterTime; }
+  BaseProfilerThreadId ThreadId() const { return mThreadId; }
+  bool IsMainThread() const { return mIsMainThread; }
+
+ private:
+  const std::string mName;
+  const TimeStamp mRegisterTime;
+  const BaseProfilerThreadId mThreadId;
+  const bool mIsMainThread;
+
+  mutable Atomic<int32_t, MemoryOrdering::ReleaseAcquire> mRefCnt;
+};
+
+}  // namespace baseprofiler
+}  // namespace mozilla
+
+#endif  // ThreadInfo_h