components/tracing/child_memory_dump_manager_delegate_impl.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/tracing/child_memory_dump_manager_delegate_impl.h"
   6
   7 #include "base/single_thread_task_runner.h"
   8 #include "components/tracing/child_trace_message_filter.h"
   9
  10 namespace tracing {
  11
  12 // static
  13 ChildMemoryDumpManagerDelegateImpl*
  14 ChildMemoryDumpManagerDelegateImpl::GetInstance() {
  15   return Singleton<
  16       ChildMemoryDumpManagerDelegateImpl,
  17       LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
  18 }
  19
  20 ChildMemoryDumpManagerDelegateImpl::ChildMemoryDumpManagerDelegateImpl()
  21     : ctmf_(nullptr) {
  22   base::trace_event::MemoryDumpManager::GetInstance()->SetDelegate(this);
  23 }
  24
  25 ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {
  26 }
  27
  28 void ChildMemoryDumpManagerDelegateImpl::SetChildTraceMessageFilter(
  29     ChildTraceMessageFilter* ctmf) {
  30   // Check that we are either registering the CTMF or tearing it down, but not
  31   // replacing a valid instance with another one (should never happen).
  32   DCHECK(ctmf_ == nullptr || (ctmf == nullptr && ctmf_task_runner_ != nullptr));
  33   ctmf_ = ctmf;
  34   ctmf_task_runner_ = ctmf ? (ctmf->ipc_task_runner()) : nullptr;
  35 }
  36
  37 // Invoked in child processes by the MemoryDumpManager.
  38 void ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump(
  39     const base::trace_event::MemoryDumpRequestArgs& args,
  40     const base::trace_event::MemoryDumpCallback& callback) {
  41   // Bail out if we receive a dump request from the manager before the
  42   // ChildTraceMessageFilter has been initialized.
  43   if (!ctmf_task_runner_) {
  44     if (!callback.is_null())
  45       callback.Run(args.dump_guid, false /* success */);
  46     return;
  47   }
  48
  49   // Make sure we access |ctmf_| only on the thread where it lives to avoid
  50   // races on shutdown.
  51   if (!ctmf_task_runner_->BelongsToCurrentThread()) {
  52     ctmf_task_runner_->PostTask(
  53         FROM_HERE,
  54         base::Bind(&ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump,
  55                    base::Unretained(this), args, callback));
  56     return;
  57   }
  58
  59   // The ChildTraceMessageFilter could have been destroyed while hopping on the
  60   // right thread. If this is the case, bail out.
  61   if (!ctmf_) {
  62     if (!callback.is_null())
  63       callback.Run(args.dump_guid, false /* success */);
  64     return;
  65   }
  66
  67   // Send the request up to the browser process' MessageDumpmanager.
  68   ctmf_->SendGlobalMemoryDumpRequest(args, callback);
  69 }
  70
  71 bool ChildMemoryDumpManagerDelegateImpl::IsCoordinatorProcess() const {
  72   return false;
  73 }
  74
  75 }  // namespace tracing