
bind.h, callback.h, callback_forward.h, and callback_helpers.h moved into /base/functional/. Update the include paths to directly include them in their new location. Bug: 1364441 Change-Id: I36784c7cc322001d0b0ec2590c3847f4298033ad Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4157596 Owners-Override: Avi Drissman <avi@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Commit-Queue: Daniel Cheng <dcheng@chromium.org> Owners-Override: Daniel Cheng <dcheng@chromium.org> Auto-Submit: Avi Drissman <avi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1091526}
304 lines
8.6 KiB
C++
304 lines
8.6 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "ppapi/proxy/ppb_message_loop_proxy.h"
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#include <stddef.h>
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#include <memory>
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#include <vector>
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#include "base/check.h"
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#include "base/compiler_specific.h"
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#include "base/functional/bind.h"
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#include "base/functional/callback_helpers.h"
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#include "base/task/single_thread_task_runner.h"
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#include "ppapi/c/pp_errors.h"
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#include "ppapi/c/ppb_message_loop.h"
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#include "ppapi/proxy/plugin_dispatcher.h"
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#include "ppapi/proxy/plugin_globals.h"
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#include "ppapi/shared_impl/proxy_lock.h"
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#include "ppapi/thunk/enter.h"
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using ppapi::thunk::PPB_MessageLoop_API;
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namespace ppapi {
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namespace proxy {
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namespace {
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typedef thunk::EnterResource<PPB_MessageLoop_API> EnterMessageLoop;
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}
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MessageLoopResource::MessageLoopResource(PP_Instance instance)
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: MessageLoopShared(instance),
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nested_invocations_(0),
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destroyed_(false),
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should_destroy_(false),
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is_main_thread_loop_(false),
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currently_handling_blocking_message_(false) {
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}
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MessageLoopResource::MessageLoopResource(ForMainThread for_main_thread)
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: MessageLoopShared(for_main_thread),
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nested_invocations_(0),
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destroyed_(false),
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should_destroy_(false),
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is_main_thread_loop_(true),
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currently_handling_blocking_message_(false) {
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// We attach the main thread immediately. We can't use AttachToCurrentThread,
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// because the MessageLoop already exists.
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// This must be called only once, so the slot must be empty.
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CHECK(!PluginGlobals::Get()->msg_loop_slot());
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// We don't add a reference for TLS here, so we don't release it. Instead,
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// this loop is owned by PluginGlobals. Contrast with AttachToCurrentThread
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// where we register ReleaseMessageLoop with TLS and call AddRef.
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base::ThreadLocalStorage::Slot* slot = new base::ThreadLocalStorage::Slot();
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PluginGlobals::Get()->set_msg_loop_slot(slot);
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slot->Set(this);
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task_runner_ = base::SingleThreadTaskRunner::GetCurrentDefault();
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}
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MessageLoopResource::~MessageLoopResource() {
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}
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PPB_MessageLoop_API* MessageLoopResource::AsPPB_MessageLoop_API() {
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return this;
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}
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int32_t MessageLoopResource::AttachToCurrentThread() {
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if (is_main_thread_loop_)
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return PP_ERROR_INPROGRESS;
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PluginGlobals* globals = PluginGlobals::Get();
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base::ThreadLocalStorage::Slot* slot = globals->msg_loop_slot();
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if (!slot) {
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slot = new base::ThreadLocalStorage::Slot(&ReleaseMessageLoop);
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globals->set_msg_loop_slot(slot);
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} else {
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if (slot->Get())
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return PP_ERROR_INPROGRESS;
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}
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// TODO(dmichael) check that the current thread can support a task executor.
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// Take a ref to the MessageLoop on behalf of the TLS. Note that this is an
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// internal ref and not a plugin ref so the plugin can't accidentally
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// release it. This is released by ReleaseMessageLoop().
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AddRef();
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slot->Set(this);
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single_thread_task_executor_ =
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std::make_unique<base::SingleThreadTaskExecutor>();
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task_runner_ = base::SingleThreadTaskRunner::GetCurrentDefault();
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// Post all pending work to the task executor.
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for (auto& info : pending_tasks_) {
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PostClosure(info.from_here, std::move(info.closure), info.delay_ms);
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}
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pending_tasks_.clear();
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return PP_OK;
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}
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int32_t MessageLoopResource::Run() {
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if (!IsCurrent())
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return PP_ERROR_WRONG_THREAD;
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if (is_main_thread_loop_)
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return PP_ERROR_INPROGRESS;
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base::RunLoop* previous_run_loop = run_loop_;
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base::RunLoop run_loop;
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run_loop_ = &run_loop;
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nested_invocations_++;
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CallWhileUnlocked(base::BindOnce(&base::RunLoop::Run,
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base::Unretained(run_loop_), FROM_HERE));
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nested_invocations_--;
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run_loop_ = previous_run_loop;
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if (should_destroy_ && nested_invocations_ == 0) {
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task_runner_.reset();
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single_thread_task_executor_.reset();
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destroyed_ = true;
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}
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return PP_OK;
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}
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int32_t MessageLoopResource::PostWork(PP_CompletionCallback callback,
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int64_t delay_ms) {
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if (!callback.func)
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return PP_ERROR_BADARGUMENT;
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if (destroyed_)
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return PP_ERROR_FAILED;
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PostClosure(FROM_HERE,
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base::BindOnce(callback.func, callback.user_data,
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static_cast<int32_t>(PP_OK)),
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delay_ms);
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return PP_OK;
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}
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int32_t MessageLoopResource::PostQuit(PP_Bool should_destroy) {
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if (is_main_thread_loop_)
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return PP_ERROR_WRONG_THREAD;
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if (PP_ToBool(should_destroy))
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should_destroy_ = true;
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if (IsCurrent() && nested_invocations_ > 0) {
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run_loop_->QuitWhenIdle();
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} else {
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PostClosure(FROM_HERE,
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base::BindOnce(&MessageLoopResource::QuitRunLoopWhenIdle,
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Unretained(this)),
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0);
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}
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return PP_OK;
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}
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// static
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MessageLoopResource* MessageLoopResource::GetCurrent() {
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PluginGlobals* globals = PluginGlobals::Get();
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if (!globals->msg_loop_slot())
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return NULL;
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return reinterpret_cast<MessageLoopResource*>(
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globals->msg_loop_slot()->Get());
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}
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void MessageLoopResource::DetachFromThread() {
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// Note that the task executor must be destroyed on the thread it was created
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// on.
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task_runner_.reset();
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single_thread_task_executor_.reset();
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// Cancel out the AddRef in AttachToCurrentThread().
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Release();
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// DANGER: may delete this.
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}
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bool MessageLoopResource::IsCurrent() const {
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PluginGlobals* globals = PluginGlobals::Get();
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if (!globals->msg_loop_slot())
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return false; // Can't be current if there's nothing in the slot.
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return static_cast<const void*>(globals->msg_loop_slot()->Get()) ==
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static_cast<const void*>(this);
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}
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void MessageLoopResource::PostClosure(const base::Location& from_here,
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base::OnceClosure closure,
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int64_t delay_ms) {
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if (task_runner_.get()) {
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task_runner_->PostDelayedTask(from_here, std::move(closure),
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base::Milliseconds(delay_ms));
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} else {
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TaskInfo info;
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info.from_here = FROM_HERE;
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info.closure = std::move(closure);
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info.delay_ms = delay_ms;
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pending_tasks_.push_back(std::move(info));
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}
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}
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base::SingleThreadTaskRunner* MessageLoopResource::GetTaskRunner() {
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return task_runner_.get();
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}
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bool MessageLoopResource::CurrentlyHandlingBlockingMessage() {
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return currently_handling_blocking_message_;
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}
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void MessageLoopResource::QuitRunLoopWhenIdle() {
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DCHECK(IsCurrent());
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DCHECK(run_loop_);
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run_loop_->QuitWhenIdle();
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}
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// static
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void MessageLoopResource::ReleaseMessageLoop(void* value) {
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static_cast<MessageLoopResource*>(value)->DetachFromThread();
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}
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// -----------------------------------------------------------------------------
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PP_Resource Create(PP_Instance instance) {
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ProxyAutoLock lock;
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// Validate the instance.
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PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
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if (!dispatcher)
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return 0;
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return (new MessageLoopResource(instance))->GetReference();
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}
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PP_Resource GetForMainThread() {
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ProxyAutoLock lock;
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return PluginGlobals::Get()->loop_for_main_thread()->GetReference();
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}
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PP_Resource GetCurrent() {
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ProxyAutoLock lock;
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Resource* resource = MessageLoopResource::GetCurrent();
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if (resource)
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return resource->GetReference();
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return 0;
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}
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int32_t AttachToCurrentThread(PP_Resource message_loop) {
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EnterMessageLoop enter(message_loop, true);
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if (enter.succeeded())
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return enter.object()->AttachToCurrentThread();
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return PP_ERROR_BADRESOURCE;
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}
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int32_t Run(PP_Resource message_loop) {
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EnterMessageLoop enter(message_loop, true);
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if (enter.succeeded())
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return enter.object()->Run();
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return PP_ERROR_BADRESOURCE;
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}
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int32_t PostWork(PP_Resource message_loop,
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PP_CompletionCallback callback,
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int64_t delay_ms) {
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EnterMessageLoop enter(message_loop, true);
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if (enter.succeeded())
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return enter.object()->PostWork(callback, delay_ms);
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return PP_ERROR_BADRESOURCE;
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}
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int32_t PostQuit(PP_Resource message_loop, PP_Bool should_destroy) {
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EnterMessageLoop enter(message_loop, true);
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if (enter.succeeded())
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return enter.object()->PostQuit(should_destroy);
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return PP_ERROR_BADRESOURCE;
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}
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const PPB_MessageLoop_1_0 ppb_message_loop_interface = {
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&Create,
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&GetForMainThread,
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&GetCurrent,
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&AttachToCurrentThread,
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&Run,
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&PostWork,
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&PostQuit
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};
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PPB_MessageLoop_Proxy::PPB_MessageLoop_Proxy(Dispatcher* dispatcher)
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: InterfaceProxy(dispatcher) {
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}
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PPB_MessageLoop_Proxy::~PPB_MessageLoop_Proxy() {
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}
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// static
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const PPB_MessageLoop_1_0* PPB_MessageLoop_Proxy::GetInterface() {
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return &ppb_message_loop_interface;
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}
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} // namespace proxy
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} // namespace ppapi
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