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// Copyright (c) 2012 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 "base/callback.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "webkit/glue/worker_task_runner.h"
using WebKit::WebWorkerRunLoop;
namespace {
class RunClosureTask : public WebWorkerRunLoop::Task {
public:
RunClosureTask(const base::Closure& task) : task_(task) {}
virtual ~RunClosureTask() {}
virtual void Run() {
task_.Run();
}
private:
base::Closure task_;
};
} // unnamed namespace
namespace webkit_glue {
struct WorkerTaskRunner::ThreadLocalState {
ThreadLocalState(int id, const WebWorkerRunLoop& loop)
: id_(id), run_loop_(loop) {
}
int id_;
WebWorkerRunLoop run_loop_;
ObserverList<WorkerTaskRunner::Observer> stop_observers_;
};
WorkerTaskRunner::WorkerTaskRunner() {
// Start worker ids at 1, 0 is reserved for the main thread.
int id = id_sequence_.GetNext();
DCHECK(!id);
}
bool WorkerTaskRunner::PostTask(
int id, const base::Closure& closure) {
DCHECK(id > 0);
base::AutoLock locker(loop_map_lock_);
IDToLoopMap::iterator found = loop_map_.find(id);
if (found != loop_map_.end())
found->second.postTask(new RunClosureTask(closure));
return found != loop_map_.end();
}
int WorkerTaskRunner::CurrentWorkerId() {
if (!current_tls_.Get())
return 0;
return current_tls_.Get()->id_;
}
WorkerTaskRunner* WorkerTaskRunner::Instance() {
static base::LazyInstance<WorkerTaskRunner>::Leaky
worker_task_runner = LAZY_INSTANCE_INITIALIZER;
return worker_task_runner.Pointer();
}
void WorkerTaskRunner::AddStopObserver(Observer* obs) {
DCHECK(CurrentWorkerId() > 0);
current_tls_.Get()->stop_observers_.AddObserver(obs);
}
void WorkerTaskRunner::RemoveStopObserver(Observer* obs) {
DCHECK(CurrentWorkerId() > 0);
current_tls_.Get()->stop_observers_.RemoveObserver(obs);
}
WorkerTaskRunner::~WorkerTaskRunner() {
}
void WorkerTaskRunner::OnWorkerRunLoopStarted(const WebWorkerRunLoop& loop) {
DCHECK(!current_tls_.Get());
int id = id_sequence_.GetNext();
current_tls_.Set(new ThreadLocalState(id, loop));
base::AutoLock locker_(loop_map_lock_);
loop_map_[id] = loop;
}
void WorkerTaskRunner::OnWorkerRunLoopStopped(const WebWorkerRunLoop& loop) {
DCHECK(current_tls_.Get());
FOR_EACH_OBSERVER(Observer, current_tls_.Get()->stop_observers_,
OnWorkerRunLoopStopped());
{
base::AutoLock locker(loop_map_lock_);
DCHECK(loop_map_[CurrentWorkerId()] == loop);
loop_map_.erase(CurrentWorkerId());
}
delete current_tls_.Get();
current_tls_.Set(NULL);
}
} // namespace webkit_glue
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