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Unified Diff: mojo/public/cpp/utility/lib/run_loop.cc

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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Index: mojo/public/cpp/utility/lib/run_loop.cc
diff --git a/mojo/public/cpp/utility/lib/run_loop.cc b/mojo/public/cpp/utility/lib/run_loop.cc
deleted file mode 100644
index 7faf748f757808f0e6df9c188483073184727130..0000000000000000000000000000000000000000
--- a/mojo/public/cpp/utility/lib/run_loop.cc
+++ /dev/null
@@ -1,267 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "mojo/public/cpp/utility/run_loop.h"
-
-#include <assert.h>
-
-#include <algorithm>
-#include <vector>
-
-#include "mojo/public/cpp/utility/lib/thread_local.h"
-#include "mojo/public/cpp/utility/run_loop_handler.h"
-
-namespace mojo {
-namespace {
-
-internal::ThreadLocalPointer<RunLoop> current_run_loop;
-
-const MojoTimeTicks kInvalidTimeTicks = static_cast<MojoTimeTicks>(0);
-
-} // namespace
-
-// State needed for one iteration of WaitMany().
-struct RunLoop::WaitState {
- WaitState() : deadline(MOJO_DEADLINE_INDEFINITE) {}
-
- std::vector<Handle> handles;
- std::vector<MojoHandleSignals> handle_signals;
- MojoDeadline deadline;
-};
-
-struct RunLoop::RunState {
- RunState() : should_quit(false) {}
-
- bool should_quit;
-};
-
-RunLoop::RunLoop()
- : run_state_(nullptr), next_handler_id_(0), next_sequence_number_(0) {
- assert(!current());
- current_run_loop.Set(this);
-}
-
-RunLoop::~RunLoop() {
- assert(current() == this);
- NotifyHandlers(MOJO_RESULT_ABORTED, IGNORE_DEADLINE);
- current_run_loop.Set(nullptr);
-}
-
-// static
-void RunLoop::SetUp() {
- current_run_loop.Allocate();
-}
-
-// static
-void RunLoop::TearDown() {
- assert(!current());
- current_run_loop.Free();
-}
-
-// static
-RunLoop* RunLoop::current() {
- return current_run_loop.Get();
-}
-
-void RunLoop::AddHandler(RunLoopHandler* handler,
- const Handle& handle,
- MojoHandleSignals handle_signals,
- MojoDeadline deadline) {
- assert(current() == this);
- assert(handler);
- assert(handle.is_valid());
- // Assume it's an error if someone tries to reregister an existing handle.
- assert(0u == handler_data_.count(handle));
- HandlerData handler_data;
- handler_data.handler = handler;
- handler_data.handle_signals = handle_signals;
- handler_data.deadline =
- (deadline == MOJO_DEADLINE_INDEFINITE)
- ? kInvalidTimeTicks
- : GetTimeTicksNow() + static_cast<MojoTimeTicks>(deadline);
- handler_data.id = next_handler_id_++;
- handler_data_[handle] = handler_data;
-}
-
-void RunLoop::RemoveHandler(const Handle& handle) {
- assert(current() == this);
- handler_data_.erase(handle);
-}
-
-bool RunLoop::HasHandler(const Handle& handle) const {
- return handler_data_.find(handle) != handler_data_.end();
-}
-
-void RunLoop::Run() {
- RunInternal(UNTIL_EMPTY);
-}
-
-void RunLoop::RunUntilIdle() {
- RunInternal(UNTIL_IDLE);
-}
-
-void RunLoop::RunInternal(RunMode run_mode) {
- assert(current() == this);
- RunState* old_state = run_state_;
- RunState run_state;
- run_state_ = &run_state;
- for (;;) {
- bool did_work = DoDelayedWork();
- if (run_state.should_quit)
- break;
- did_work |= Wait(run_mode == UNTIL_IDLE);
- if (run_state.should_quit)
- break;
- if (!did_work && run_mode == UNTIL_IDLE)
- break;
- }
- run_state_ = old_state;
-}
-
-bool RunLoop::DoDelayedWork() {
- MojoTimeTicks now = GetTimeTicksNow();
- if (!delayed_tasks_.empty() && delayed_tasks_.top().run_time <= now) {
- PendingTask task = delayed_tasks_.top();
- delayed_tasks_.pop();
- task.task.Run();
- return true;
- }
- return false;
-}
-
-void RunLoop::Quit() {
- assert(current() == this);
- if (run_state_)
- run_state_->should_quit = true;
-}
-
-void RunLoop::PostDelayedTask(const Closure& task, MojoTimeTicks delay) {
- assert(current() == this);
- MojoTimeTicks run_time = delay + GetTimeTicksNow();
- delayed_tasks_.push(PendingTask(task, run_time, next_sequence_number_++));
-}
-
-bool RunLoop::Wait(bool non_blocking) {
- const WaitState wait_state = GetWaitState(non_blocking);
- if (wait_state.handles.empty()) {
- if (delayed_tasks_.empty())
- Quit();
- return false;
- }
-
- const WaitManyResult wmr =
- WaitMany(wait_state.handles, wait_state.handle_signals,
- wait_state.deadline, nullptr);
-
- if (!wmr.IsIndexValid()) {
- assert(wmr.result == MOJO_RESULT_DEADLINE_EXCEEDED);
- return NotifyHandlers(MOJO_RESULT_DEADLINE_EXCEEDED, CHECK_DEADLINE);
- }
-
- Handle handle = wait_state.handles[wmr.index];
- assert(handler_data_.find(handle) != handler_data_.end());
- RunLoopHandler* handler = handler_data_[handle].handler;
-
- switch (wmr.result) {
- case MOJO_RESULT_OK:
- handler->OnHandleReady(handle);
- return true;
- case MOJO_RESULT_INVALID_ARGUMENT:
- case MOJO_RESULT_FAILED_PRECONDITION:
- // Remove the handle first, this way if OnHandleError() tries to remove
- // the handle our iterator isn't invalidated.
- handler_data_.erase(handle);
- handler->OnHandleError(handle, wmr.result);
- return true;
- default:
- assert(false);
- return false;
- }
-}
-
-bool RunLoop::NotifyHandlers(MojoResult error, CheckDeadline check) {
- bool notified = false;
-
- // Make a copy in case someone tries to add/remove new handlers as part of
- // notifying.
- const HandleToHandlerData cloned_handlers(handler_data_);
- const MojoTimeTicks now(GetTimeTicksNow());
- for (HandleToHandlerData::const_iterator i = cloned_handlers.begin();
- i != cloned_handlers.end();
- ++i) {
- // Only check deadline exceeded if that's what we're notifying.
- if (check == CHECK_DEADLINE &&
- (i->second.deadline == kInvalidTimeTicks || i->second.deadline > now)) {
- continue;
- }
-
- // Since we're iterating over a clone of the handlers, verify the handler
- // is still valid before notifying.
- if (handler_data_.find(i->first) == handler_data_.end() ||
- handler_data_[i->first].id != i->second.id) {
- continue;
- }
-
- RunLoopHandler* handler = i->second.handler;
- handler_data_.erase(i->first);
- handler->OnHandleError(i->first, error);
- notified = true;
- }
-
- return notified;
-}
-
-RunLoop::WaitState RunLoop::GetWaitState(bool non_blocking) const {
- WaitState wait_state;
- MojoTimeTicks min_time = kInvalidTimeTicks;
- for (HandleToHandlerData::const_iterator i = handler_data_.begin();
- i != handler_data_.end();
- ++i) {
- wait_state.handles.push_back(i->first);
- wait_state.handle_signals.push_back(i->second.handle_signals);
- if (!non_blocking && i->second.deadline != kInvalidTimeTicks &&
- (min_time == kInvalidTimeTicks || i->second.deadline < min_time)) {
- min_time = i->second.deadline;
- }
- }
- if (!delayed_tasks_.empty()) {
- MojoTimeTicks delayed_min_time = delayed_tasks_.top().run_time;
- if (min_time == kInvalidTimeTicks)
- min_time = delayed_min_time;
- else
- min_time = std::min(min_time, delayed_min_time);
- }
- if (non_blocking) {
- wait_state.deadline = static_cast<MojoDeadline>(0);
- } else if (min_time != kInvalidTimeTicks) {
- const MojoTimeTicks now = GetTimeTicksNow();
- if (min_time < now)
- wait_state.deadline = static_cast<MojoDeadline>(0);
- else
- wait_state.deadline = static_cast<MojoDeadline>(min_time - now);
- }
- return wait_state;
-}
-
-RunLoop::PendingTask::PendingTask(const Closure& task,
- MojoTimeTicks run_time,
- uint64_t sequence_number)
- : task(task), run_time(run_time), sequence_number(sequence_number) {
-}
-
-RunLoop::PendingTask::~PendingTask() {
-}
-
-bool RunLoop::PendingTask::operator<(const RunLoop::PendingTask& other) const {
- if (run_time != other.run_time) {
- // std::priority_queue<> puts the least element at the end of the queue. We
- // want the soonest eligible task to be at the head of the queue, so
- // run_times further in the future are considered lesser.
- return run_time > other.run_time;
- }
-
- return sequence_number > other.sequence_number;
-}
-
-} // namespace mojo
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