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// Copyright (c) 2011 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 "chrome_frame/task_marshaller.h"
#include "base/callback.h"
#include "base/logging.h"
TaskMarshallerThroughMessageQueue::TaskMarshallerThroughMessageQueue()
: wnd_(NULL),
msg_(0xFFFF) {
}
TaskMarshallerThroughMessageQueue::~TaskMarshallerThroughMessageQueue() {
ClearTasks();
}
void TaskMarshallerThroughMessageQueue::PostTask(
const tracked_objects::Location& from_here, const base::Closure& task) {
DCHECK(wnd_ != NULL);
lock_.Acquire();
bool has_work = !pending_tasks_.empty();
pending_tasks_.push(task);
lock_.Release();
// Don't post message if there is already one.
if (has_work)
return;
if (!::PostMessage(wnd_, msg_, 0, 0)) {
DVLOG(1) << "Dropping MSG_EXECUTE_TASK message for destroyed window.";
ClearTasks();
}
}
void TaskMarshallerThroughMessageQueue::PostDelayedTask(
const tracked_objects::Location& source,
const base::Closure& task,
base::TimeDelta& delay) {
DCHECK(wnd_);
base::AutoLock lock(lock_);
base::PendingTask delayed_task(source, task, base::TimeTicks::Now() + delay,
true);
base::TimeTicks top_run_time = delayed_tasks_.top().delayed_run_time;
delayed_tasks_.push(delayed_task);
// Reschedule the timer if |delayed_task| will be the next delayed task to
// run.
if (delayed_task.delayed_run_time < top_run_time) {
::SetTimer(wnd_, reinterpret_cast<UINT_PTR>(this),
static_cast<DWORD>(delay.InMilliseconds()), NULL);
}
}
BOOL TaskMarshallerThroughMessageQueue::ProcessWindowMessage(HWND hWnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam,
LRESULT& lResult,
DWORD dwMsgMapID) {
if (hWnd == wnd_ && uMsg == msg_) {
ExecuteQueuedTasks();
lResult = 0;
return TRUE;
}
if (hWnd == wnd_ && uMsg == WM_TIMER) {
ExecuteDelayedTasks();
lResult = 0;
return TRUE;
}
return FALSE;
}
base::Closure TaskMarshallerThroughMessageQueue::PopTask() {
base::AutoLock lock(lock_);
if (pending_tasks_.empty())
return base::Closure();
base::Closure task = pending_tasks_.front();
pending_tasks_.pop();
return task;
}
void TaskMarshallerThroughMessageQueue::ExecuteQueuedTasks() {
DCHECK(CalledOnValidThread());
base::Closure task;
while (!(task = PopTask()).is_null())
task.Run();
}
void TaskMarshallerThroughMessageQueue::ExecuteDelayedTasks() {
DCHECK(CalledOnValidThread());
::KillTimer(wnd_, reinterpret_cast<UINT_PTR>(this));
while (true) {
lock_.Acquire();
if (delayed_tasks_.empty()) {
lock_.Release();
return;
}
base::PendingTask next_task = delayed_tasks_.top();
base::TimeTicks now = base::TimeTicks::Now();
base::TimeTicks next_run = next_task.delayed_run_time;
if (next_run > now) {
int64 delay = (next_run - now).InMillisecondsRoundedUp();
::SetTimer(wnd_, reinterpret_cast<UINT_PTR>(this),
static_cast<DWORD>(delay), NULL);
lock_.Release();
return;
}
delayed_tasks_.pop();
lock_.Release();
// Run the task outside the lock.
next_task.task.Run();
}
}
void TaskMarshallerThroughMessageQueue::ClearTasks() {
base::AutoLock lock(lock_);
DVLOG_IF(1, !pending_tasks_.empty()) << "Destroying "
<< pending_tasks_.size()
<< " pending tasks.";
while (!pending_tasks_.empty())
pending_tasks_.pop();
while (!delayed_tasks_.empty())
delayed_tasks_.pop();
}
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