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// 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/services/tracing/public/cpp/tracing_impl.h"
#include <utility>
#include "base/lazy_instance.h"
#include "base/synchronization/lock.h"
#include "base/threading/platform_thread.h"
#include "base/trace_event/trace_event_impl.h"
#include "mojo/application/public/cpp/application_impl.h"
#ifdef NDEBUG
#include "base/command_line.h"
#include "mojo/services/tracing/public/cpp/switches.h"
#endif
namespace mojo {
namespace {
// Controls access to |g_tracing_singleton_created|, which can be accessed from
// different threads.
base::LazyInstance<base::Lock>::Leaky g_singleton_lock =
LAZY_INSTANCE_INITIALIZER;
// Whether we are the first TracingImpl to be created in this mojo
// application. The first TracingImpl in a physical mojo application connects
// to the mojo:tracing service.
//
// If this is a ContentHandler, it will outlive all its served Applications. If
// this is a raw mojo application, it is the only Application served.
bool g_tracing_singleton_created = false;
}
TracingImpl::TracingImpl() {
}
TracingImpl::~TracingImpl() {
}
void TracingImpl::Initialize(ApplicationImpl* app) {
{
base::AutoLock lock(g_singleton_lock.Get());
if (g_tracing_singleton_created)
return;
g_tracing_singleton_created = true;
}
// This will only set the name for the first app in a loaded mojo file. It's
// up to something like CoreServices to name its own child threads.
base::PlatformThread::SetName(app->url());
connection_ = app->ConnectToApplication("mojo:tracing");
connection_->AddService(this);
#ifdef NDEBUG
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
tracing::kEarlyTracing)) {
provider_impl_.ForceEnableTracing();
}
#else
provider_impl_.ForceEnableTracing();
#endif
}
void TracingImpl::Create(ApplicationConnection* connection,
InterfaceRequest<tracing::TraceProvider> request) {
provider_impl_.Bind(std::move(request));
}
} // namespace mojo
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