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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /dom/file/ipc/RemoteLazyInputStreamThread.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/file/ipc/RemoteLazyInputStreamThread.cpp')
-rw-r--r--dom/file/ipc/RemoteLazyInputStreamThread.cpp238
1 files changed, 238 insertions, 0 deletions
diff --git a/dom/file/ipc/RemoteLazyInputStreamThread.cpp b/dom/file/ipc/RemoteLazyInputStreamThread.cpp
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+++ b/dom/file/ipc/RemoteLazyInputStreamThread.cpp
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+/* -*- 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 "RemoteLazyInputStreamThread.h"
+
+#include "ErrorList.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "nsXPCOMPrivate.h"
+
+using namespace mozilla::ipc;
+
+namespace mozilla {
+
+namespace {
+
+StaticMutex gRemoteLazyThreadMutex;
+StaticRefPtr<RemoteLazyInputStreamThread> gRemoteLazyThread;
+
+class ThreadInitializeRunnable final : public Runnable {
+ public:
+ ThreadInitializeRunnable() : Runnable("dom::ThreadInitializeRunnable") {}
+
+ NS_IMETHOD
+ Run() override {
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+ MOZ_ASSERT(gRemoteLazyThread);
+ if (NS_WARN_IF(!gRemoteLazyThread->InitializeOnMainThread())) {
+ // RemoteLazyInputStreamThread::GetOrCreate might have handed out a
+ // pointer to our thread already at this point such that we cannot
+ // just do gRemoteLazyThread = nullptr; here.
+ MOZ_DIAGNOSTIC_ASSERT(
+ false, "Async gRemoteLazyThread->InitializeOnMainThread() failed.");
+ return NS_ERROR_FAILURE;
+ }
+ return NS_OK;
+ }
+};
+
+} // namespace
+
+NS_IMPL_ISUPPORTS(RemoteLazyInputStreamThread, nsIObserver, nsIEventTarget,
+ nsISerialEventTarget, nsIDirectTaskDispatcher)
+
+bool RLISThreadIsInOrBeyondShutdown() {
+ // ShutdownPhase::XPCOMShutdownThreads matches
+ // obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
+ return AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownThreads);
+}
+
+/* static */
+RemoteLazyInputStreamThread* RemoteLazyInputStreamThread::Get() {
+ if (RLISThreadIsInOrBeyondShutdown()) {
+ return nullptr;
+ }
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ return gRemoteLazyThread;
+}
+
+/* static */
+RemoteLazyInputStreamThread* RemoteLazyInputStreamThread::GetOrCreate() {
+ if (RLISThreadIsInOrBeyondShutdown()) {
+ return nullptr;
+ }
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ if (!gRemoteLazyThread) {
+ gRemoteLazyThread = new RemoteLazyInputStreamThread();
+ if (!gRemoteLazyThread->Initialize()) {
+ gRemoteLazyThread = nullptr;
+ }
+ }
+
+ return gRemoteLazyThread;
+}
+
+bool RemoteLazyInputStreamThread::Initialize() {
+ nsCOMPtr<nsIThread> thread;
+ nsresult rv = NS_NewNamedThread("RemoteLzyStream", getter_AddRefs(thread));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return false;
+ }
+
+ mThread = thread;
+
+ if (!NS_IsMainThread()) {
+ RefPtr<Runnable> runnable = new ThreadInitializeRunnable();
+ nsresult rv = SchedulerGroup::Dispatch(runnable.forget());
+ return !NS_WARN_IF(NS_FAILED(rv));
+ }
+
+ return InitializeOnMainThread();
+}
+
+bool RemoteLazyInputStreamThread::InitializeOnMainThread() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+ if (NS_WARN_IF(!obs)) {
+ return false;
+ }
+
+ nsresult rv =
+ obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
+ return !NS_WARN_IF(NS_FAILED(rv));
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ MOZ_ASSERT(!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID));
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ if (mThread) {
+ mThread->Shutdown();
+ mThread = nullptr;
+ }
+
+ gRemoteLazyThread = nullptr;
+
+ return NS_OK;
+}
+
+// nsIEventTarget
+
+NS_IMETHODIMP_(bool)
+RemoteLazyInputStreamThread::IsOnCurrentThreadInfallible() {
+ return mThread->IsOnCurrentThread();
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::IsOnCurrentThread(bool* aRetval) {
+ return mThread->IsOnCurrentThread(aRetval);
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::Dispatch(already_AddRefed<nsIRunnable> aRunnable,
+ uint32_t aFlags) {
+ nsCOMPtr<nsIRunnable> runnable(aRunnable);
+
+ if (RLISThreadIsInOrBeyondShutdown()) {
+ // nsIEventTarget::Dispatch must leak the runnable if the dispatch fails.
+ (void)runnable.forget();
+
+ return NS_ERROR_ILLEGAL_DURING_SHUTDOWN;
+ }
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ return mThread->Dispatch(runnable.forget(), aFlags);
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::DispatchFromScript(nsIRunnable* aRunnable,
+ uint32_t aFlags) {
+ nsCOMPtr<nsIRunnable> runnable(aRunnable);
+ return Dispatch(runnable.forget(), aFlags);
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::DelayedDispatch(already_AddRefed<nsIRunnable>,
+ uint32_t) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::RegisterShutdownTask(nsITargetShutdownTask*) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::UnregisterShutdownTask(nsITargetShutdownTask*) {
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+RemoteLazyInputStreamThread::DispatchDirectTask(
+ already_AddRefed<nsIRunnable> aRunnable) {
+ nsCOMPtr<nsIRunnable> runnable(aRunnable);
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
+
+ if (dispatcher) {
+ return dispatcher->DispatchDirectTask(runnable.forget());
+ }
+
+ return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP RemoteLazyInputStreamThread::DrainDirectTasks() {
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
+
+ if (dispatcher) {
+ return dispatcher->DrainDirectTasks();
+ }
+
+ return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP RemoteLazyInputStreamThread::HaveDirectTasks(bool* aValue) {
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+
+ nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
+
+ if (dispatcher) {
+ return dispatcher->HaveDirectTasks(aValue);
+ }
+
+ return NS_ERROR_FAILURE;
+}
+
+bool IsOnDOMFileThread() {
+ MOZ_ASSERT(!RLISThreadIsInOrBeyondShutdown());
+
+ StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
+ MOZ_ASSERT(gRemoteLazyThread);
+
+ return gRemoteLazyThread->IsOnCurrentThreadInfallible();
+}
+
+void AssertIsOnDOMFileThread() { MOZ_ASSERT(IsOnDOMFileThread()); }
+
+} // namespace mozilla