Mojo: Move mojo/public/utility to mojo/public/cpp/utility.

mojo/public/utility/lib/run_loop.cc

-// 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/utility/run_loop.h"
-
-#include <assert.h>
-
-#include <algorithm>
-#include <vector>
-
-#include "mojo/public/utility/lib/thread_local.h"
-#include "mojo/public/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<MojoWaitFlags> wait_flags;
-  MojoDeadline deadline;
-};
-
-struct RunLoop::RunState {
-  RunState() : should_quit(false) {}
-
-  bool should_quit;
-};
-
-RunLoop::RunLoop() : run_state_(NULL), next_handler_id_(0) {
-  assert(!current());
-  current_run_loop.Set(this);
-}
-
-RunLoop::~RunLoop() {
-  assert(current() == this);
-  current_run_loop.Set(NULL);
-}
-
-// 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,
-                         MojoWaitFlags wait_flags,
-                         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.wait_flags = wait_flags;
-  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() {
-  assert(current() == this);
-  // We don't currently support nesting.
-  assert(!run_state_);
-  RunState* old_state = run_state_;
-  RunState run_state;
-  run_state_ = &run_state;
-  while (!run_state.should_quit)
-    Wait(false);
-  run_state_ = old_state;
-}
-
-void RunLoop::RunUntilIdle() {
-  assert(current() == this);
-  // We don't currently support nesting.
-  assert(!run_state_);
-  RunState* old_state = run_state_;
-  RunState run_state;
-  run_state_ = &run_state;
-  while (!run_state.should_quit) {
-    if (!Wait(true))
-      break;
-  }
-  run_state_ = old_state;
-}
-
-void RunLoop::Quit() {
-  assert(current() == this);
-  if (run_state_)
-    run_state_->should_quit = true;
-}
-
-bool RunLoop::Wait(bool non_blocking) {
-  const WaitState wait_state = GetWaitState(non_blocking);
-  if (wait_state.handles.empty()) {
-    Quit();
-    return false;
-  }
-
-  const MojoResult result =
-      WaitMany(wait_state.handles, wait_state.wait_flags, wait_state.deadline);
-  if (result >= 0) {
-    const size_t index = static_cast<size_t>(result);
-    assert(handler_data_.find(wait_state.handles[index]) !=
-           handler_data_.end());
-    handler_data_[wait_state.handles[index]].handler->OnHandleReady(
-        wait_state.handles[index]);
-    return true;
-  }
-
-  switch (result) {
-    case MOJO_RESULT_INVALID_ARGUMENT:
-    case MOJO_RESULT_FAILED_PRECONDITION:
-      return RemoveFirstInvalidHandle(wait_state);
-    case MOJO_RESULT_DEADLINE_EXCEEDED:
-      return NotifyDeadlineExceeded();
-  }
-
-  assert(false);
-  return false;
-}
-
-bool RunLoop::NotifyDeadlineExceeded() {
-  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) {
-    // Since we're iterating over a clone of the handlers, verify the handler is
-    // still valid before notifying.
-    if (i->second.deadline != kInvalidTimeTicks &&
-        i->second.deadline < now &&
-        handler_data_.find(i->first) != handler_data_.end() &&
-        handler_data_[i->first].id == i->second.id) {
-      handler_data_.erase(i->first);
-      i->second.handler->OnHandleError(i->first, MOJO_RESULT_DEADLINE_EXCEEDED);
-      notified = true;
-    }
-  }
-
-  return notified;
-}
-
-bool RunLoop::RemoveFirstInvalidHandle(const WaitState& wait_state) {
-  for (size_t i = 0; i < wait_state.handles.size(); ++i) {
-    const MojoResult result =
-        mojo::Wait(wait_state.handles[i], wait_state.wait_flags[i],
-                   static_cast<MojoDeadline>(0));
-    if (result == MOJO_RESULT_INVALID_ARGUMENT ||
-        result == MOJO_RESULT_FAILED_PRECONDITION) {
-      // Remove the handle first, this way if OnHandleError() tries to remove
-      // the handle our iterator isn't invalidated.
-      assert(handler_data_.find(wait_state.handles[i]) != handler_data_.end());
-      RunLoopHandler* handler =
-          handler_data_[wait_state.handles[i]].handler;
-      handler_data_.erase(wait_state.handles[i]);
-      handler->OnHandleError(wait_state.handles[i], result);
-      return true;
-    }
-    assert(MOJO_RESULT_DEADLINE_EXCEEDED == result);
-  }
-  return false;
-}
-
-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.wait_flags.push_back(i->second.wait_flags);
-    if (!non_blocking && i->second.deadline != kInvalidTimeTicks &&
-        (min_time == kInvalidTimeTicks || i->second.deadline < min_time)) {
-      min_time = i->second.deadline;
-    }
-  }
-  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;
-}
-
-}  // namespace mojo