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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "base/feature_list.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/hang_watcher.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "mojo/public/cpp/bindings/interface_endpoint_client.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/scheduler/public/main_thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/scheduler/worker/compositor_thread.h"
#include "third_party/blink/renderer/platform/scheduler/worker/compositor_thread_scheduler_impl.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
#include <unistd.h>
#endif
namespace blink {
namespace {
constinit thread_local Thread* current_thread = nullptr;
std::unique_ptr<MainThread>& GetMainThread() {
DEFINE_STATIC_LOCAL(std::unique_ptr<MainThread>, main_thread, ());
return main_thread;
}
std::unique_ptr<NonMainThread>& GetCompositorThread() {
DEFINE_STATIC_LOCAL(std::unique_ptr<NonMainThread>, compositor_thread, ());
return compositor_thread;
}
} // namespace
// static
void Thread::UpdateThreadTLS(Thread* thread) {
current_thread = thread;
}
ThreadCreationParams::ThreadCreationParams(ThreadType thread_type)
: thread_type(thread_type),
name(GetNameForThreadType(thread_type)),
frame_or_worker_scheduler(nullptr),
supports_gc(false) {}
ThreadCreationParams& ThreadCreationParams::SetThreadNameForTest(
const char* thread_name) {
name = thread_name;
return *this;
}
ThreadCreationParams& ThreadCreationParams::SetFrameOrWorkerScheduler(
FrameOrWorkerScheduler* scheduler) {
frame_or_worker_scheduler = scheduler;
return *this;
}
ThreadCreationParams& ThreadCreationParams::SetSupportsGC(bool gc_enabled) {
supports_gc = gc_enabled;
return *this;
}
void Thread::CreateAndSetCompositorThread() {
DCHECK(!GetCompositorThread());
ThreadCreationParams params(ThreadType::kCompositorThread);
params.base_thread_type = base::ThreadType::kDisplayCritical;
auto compositor_thread =
std::make_unique<scheduler::CompositorThread>(params);
compositor_thread->Init();
compositor_thread->GetTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(
&scheduler::CompositorThread::InitializeHangWatcherAndThreadName,
// It is safe to use base::Unretained here because
// `compositor_thread_instance.get()` points to an object that will be
// std::move'd into the std::unique_ptr managed by
// `GetCompositorThread()`. `GetCompositorThread()` uses
// DEFINE_STATIC_LOCAL, ensuring the CompositorThread object lives for
// the program's lifetime once assigned.
base::Unretained(compositor_thread.get())));
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
compositor_thread->GetTaskRunner()->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(&base::PlatformThread::CurrentId),
base::BindOnce([](base::PlatformThreadId compositor_thread_id) {
// Chrome OS moves tasks between control groups on thread priority
// changes. This is not possible inside the sandbox, so ask the
// browser to do it.
Platform::Current()->SetThreadType(compositor_thread_id,
base::ThreadType::kDisplayCritical);
}));
#endif
GetCompositorThread() = std::move(compositor_thread);
}
Thread* Thread::Current() {
return current_thread;
}
MainThread* Thread::MainThread() {
return GetMainThread().get();
}
NonMainThread* Thread::CompositorThread() {
return GetCompositorThread().get();
}
std::unique_ptr<MainThread> MainThread::SetMainThread(
std::unique_ptr<MainThread> main_thread) {
current_thread = main_thread.get();
std::swap(GetMainThread(), main_thread);
return main_thread;
}
Thread::Thread() = default;
Thread::~Thread() = default;
bool Thread::IsCurrentThread() const {
return current_thread == this;
}
void Thread::AddTaskObserver(TaskObserver* task_observer) {
CHECK(IsCurrentThread());
Scheduler()->AddTaskObserver(task_observer);
}
void Thread::RemoveTaskObserver(TaskObserver* task_observer) {
CHECK(IsCurrentThread());
Scheduler()->RemoveTaskObserver(task_observer);
}
#if BUILDFLAG(IS_WIN)
static_assert(sizeof(blink::PlatformThreadId) >= sizeof(DWORD),
"size of platform thread id is too small");
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
static_assert(sizeof(blink::PlatformThreadId) >= sizeof(pid_t),
"size of platform thread id is too small");
#else
#error Unexpected platform
#endif
} // namespace blink
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