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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/media/CallbackThreadRegistry.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/CallbackThreadRegistry.h')
-rw-r--r--dom/media/CallbackThreadRegistry.h60
1 files changed, 60 insertions, 0 deletions
diff --git a/dom/media/CallbackThreadRegistry.h b/dom/media/CallbackThreadRegistry.h
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+/* -*- 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 CALLBACKTHREADREGISTRY_H
+#define CALLBACKTHREADREGISTRY_H
+
+#include <cstdint>
+#include <mozilla/DataMutex.h>
+#include <nsTArray.h>
+#include <thread>
+#include <GeckoProfiler.h>
+
+namespace mozilla {
+
+// This class is a singleton that tracks various callback threads and makes
+// sure they are registered or unregistered to the profiler safely and
+// consistently.
+//
+// Register and Unregister are fairly expensive and shouldn't be used in a hot
+// path.
+class CallbackThreadRegistry final {
+ public:
+ CallbackThreadRegistry();
+
+ ~CallbackThreadRegistry() {
+ // It would be nice to be able to assert that all threads have been
+ // unregistered, but we can't: it's legal to suspend an audio stream, so
+ // that the callback isn't called, and then immediately destroy it.
+ }
+
+ CallbackThreadRegistry(const CallbackThreadRegistry&) = delete;
+ CallbackThreadRegistry& operator=(const CallbackThreadRegistry&) = delete;
+ CallbackThreadRegistry(CallbackThreadRegistry&&) = delete;
+ CallbackThreadRegistry& operator=(CallbackThreadRegistry&&) = delete;
+
+ // Returns the global instance of CallbackThreadRegistry. Safe from all
+ // threads.
+ static CallbackThreadRegistry* Get();
+
+ // This is intended to be called in the first callback of a callback
+ // thread.
+ void Register(ProfilerThreadId aThreadId, const char* aName);
+
+ // This is intended to be called when an object stops an audio callback thread
+ void Unregister(ProfilerThreadId aThreadId);
+
+ private:
+ struct ThreadUserCount {
+ ProfilerThreadId mId; // from profiler_current_thread_id
+ int mUserCount = 0;
+ };
+ DataMutex<nsTArray<ThreadUserCount>> mThreadIds;
+};
+
+} // namespace mozilla
+
+#endif // CALLBACKTHREADREGISTRY_H