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// Copyright 2015 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 "components/tracing/child_memory_dump_manager_delegate_impl.h"
#include "base/single_thread_task_runner.h"
#include "components/tracing/child_trace_message_filter.h"
namespace tracing {
namespace {
void AbortDumpRequest(const base::trace_event::MemoryDumpRequestArgs& args,
const base::trace_event::MemoryDumpCallback& callback) {
if (!callback.is_null())
callback.Run(args.dump_guid, false /* success */);
}
} // namespace
// static
ChildMemoryDumpManagerDelegateImpl*
ChildMemoryDumpManagerDelegateImpl::GetInstance() {
return base::Singleton<
ChildMemoryDumpManagerDelegateImpl,
base::LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
}
ChildMemoryDumpManagerDelegateImpl::ChildMemoryDumpManagerDelegateImpl()
: ctmf_(nullptr),
tracing_process_id_(
base::trace_event::MemoryDumpManager::kInvalidTracingProcessId) {
}
ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {}
void ChildMemoryDumpManagerDelegateImpl::SetChildTraceMessageFilter(
ChildTraceMessageFilter* ctmf) {
const auto& task_runner = ctmf ? (ctmf->ipc_task_runner()) : nullptr;
// Check that we are either registering the CTMF or tearing it down, but not
// replacing a valid instance with another one (should never happen).
DCHECK(ctmf_ == nullptr || (ctmf == nullptr && ctmf_task_runner_ != nullptr));
ctmf_ = ctmf;
{
base::AutoLock lock(lock_);
ctmf_task_runner_ = task_runner;
}
if (ctmf) {
base::trace_event::MemoryDumpManager::GetInstance()->Initialize(
this /* delegate */, false /* is_coordinator */);
}
}
// Invoked in child processes by the MemoryDumpManager.
void ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump(
const base::trace_event::MemoryDumpRequestArgs& args,
const base::trace_event::MemoryDumpCallback& callback) {
// RequestGlobalMemoryDump can be called on any thread, cannot access
// ctmf_task_runner_ as it could be racy.
scoped_refptr<base::SingleThreadTaskRunner> ctmf_task_runner;
{
base::AutoLock lock(lock_);
ctmf_task_runner = ctmf_task_runner_;
}
// Bail out if we receive a dump request from the manager before the
// ChildTraceMessageFilter has been initialized.
if (!ctmf_task_runner)
return AbortDumpRequest(args, callback);
// Make sure we access |ctmf_| only on the thread where it lives to avoid
// races on shutdown.
if (!ctmf_task_runner->BelongsToCurrentThread()) {
const bool did_post_task = ctmf_task_runner->PostTask(
FROM_HERE,
base::Bind(&ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump,
base::Unretained(this), args, callback));
if (!did_post_task)
return AbortDumpRequest(args, callback);
return;
}
// The ChildTraceMessageFilter could have been destroyed while hopping on the
// right thread. If this is the case, bail out.
if (!ctmf_)
return AbortDumpRequest(args, callback);
// Send the request up to the browser process' MessageDumpmanager.
ctmf_->SendGlobalMemoryDumpRequest(args, callback);
}
uint64 ChildMemoryDumpManagerDelegateImpl::GetTracingProcessId() const {
return tracing_process_id_;
}
} // namespace tracing
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