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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 {
// static
ChildMemoryDumpManagerDelegateImpl*
ChildMemoryDumpManagerDelegateImpl::GetInstance() {
return Singleton<
ChildMemoryDumpManagerDelegateImpl,
LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
}
ChildMemoryDumpManagerDelegateImpl::ChildMemoryDumpManagerDelegateImpl()
: ctmf_(nullptr) {
base::trace_event::MemoryDumpManager::GetInstance()->SetDelegate(this);
}
ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {
}
void ChildMemoryDumpManagerDelegateImpl::SetChildTraceMessageFilter(
ChildTraceMessageFilter* ctmf) {
// 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;
ctmf_task_runner_ = ctmf ? (ctmf->ipc_message_loop()) : nullptr;
}
// Invoked in child processes by the MemoryDumpManager.
void ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump(
const base::trace_event::MemoryDumpRequestArgs& args,
const base::trace_event::MemoryDumpCallback& callback) {
// Bail out if we receive a dump request from the manager before the
// ChildTraceMessageFilter has been initialized.
if (!ctmf_task_runner_) {
if (!callback.is_null())
callback.Run(args.dump_guid, false /* success */);
return;
}
// Make sure we access |ctmf_| only on the thread where it lives to avoid
// races on shutdown.
if (!ctmf_task_runner_->BelongsToCurrentThread()) {
ctmf_task_runner_->PostTask(
FROM_HERE,
base::Bind(&ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump,
base::Unretained(this), args, callback));
return;
}
// The ChildTraceMessageFilter could have been destroyed while hopping on the
// right thread. If this is the case, bail out.
if (!ctmf_) {
if (!callback.is_null())
callback.Run(args.dump_guid, false /* success */);
return;
}
// Send the request up to the browser process' MessageDumpmanager.
ctmf_->SendGlobalMemoryDumpRequest(args, callback);
}
} // namespace tracing
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