1 files changed, 73 insertions, 0 deletions
diff --git a/xpcom/threads/PerformanceCounter.cpp b/xpcom/threads/PerformanceCounter.cpp
new file mode 100644
index 0000000000..65ee441809
--- /dev/null
+++ b/xpcom/threads/PerformanceCounter.cpp
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; 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/. */
+
+#include "mozilla/Logging.h"
+#include "mozilla/PerformanceCounter.h"
+
+using mozilla::DispatchCategory;
+using mozilla::DispatchCounter;
+using mozilla::PerformanceCounter;
+
+static mozilla::LazyLogModule sPerformanceCounter("PerformanceCounter");
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(args) MOZ_LOG(sPerformanceCounter, mozilla::LogLevel::Debug, args)
+
+// Global counter used by PerformanceCounter CTOR via NextCounterID().
+static mozilla::Atomic<uint64_t> gNextCounterID(0);
+
+static uint64_t NextCounterID() {
+  // This can return the same value on different processes but
+  // we're fine with this behavior because consumers can use a (pid, counter_id)
+  // tuple to make instances globally unique in a browser session.
+  return ++gNextCounterID;
+}
+
+// this instance is the extension for the worker
+const DispatchCategory DispatchCategory::Worker =
+    DispatchCategory((uint32_t)TaskCategory::Count);
+
+PerformanceCounter::PerformanceCounter(const nsACString& aName)
+    : mExecutionDuration(0),
+      mTotalDispatchCount(0),
+      mDispatchCounter(),
+      mName(aName),
+      mID(NextCounterID()) {
+  LOG(("PerformanceCounter created with ID %" PRIu64, mID));
+}
+
+void PerformanceCounter::IncrementDispatchCounter(DispatchCategory aCategory) {
+  mDispatchCounter[aCategory.GetValue()] += 1;
+  mTotalDispatchCount += 1;
+  LOG(("[%s][%" PRIu64 "] Total dispatch %" PRIu64, mName.get(), GetID(),
+       uint64_t(mTotalDispatchCount)));
+}
+
+void PerformanceCounter::IncrementExecutionDuration(uint32_t aMicroseconds) {
+  mExecutionDuration += aMicroseconds;
+  LOG(("[%s][%" PRIu64 "] Total duration %" PRIu64, mName.get(), GetID(),
+       uint64_t(mExecutionDuration)));
+}
+
+const DispatchCounter& PerformanceCounter::GetDispatchCounter() const {
+  return mDispatchCounter;
+}
+
+uint64_t PerformanceCounter::GetExecutionDuration() const {
+  return mExecutionDuration;
+}
+
+uint64_t PerformanceCounter::GetTotalDispatchCount() const {
+  return mTotalDispatchCount;
+}
+
+uint32_t PerformanceCounter::GetDispatchCount(
+    DispatchCategory aCategory) const {
+  return mDispatchCounter[aCategory.GetValue()];
+}
+
+uint64_t PerformanceCounter::GetID() const { return mID; }