content/child/child_discardable_shared_memory_manager.cc

   1 // Copyright 2014 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 "content/child/child_discardable_shared_memory_manager.h"
   6
   7 #include "base/memory/discardable_shared_memory.h"
   8 #include "content/child/child_thread.h"
   9 #include "content/common/child_process_messages.h"
  10
  11 namespace content {
  12
  13 ChildDiscardableSharedMemoryManager::ChildDiscardableSharedMemoryManager(
  14     ThreadSafeSender* sender)
  15     : sender_(sender) {
  16 }
  17
  18 ChildDiscardableSharedMemoryManager::~ChildDiscardableSharedMemoryManager() {
  19 }
  20
  21 scoped_ptr<base::DiscardableSharedMemory>
  22 ChildDiscardableSharedMemoryManager::AllocateLockedDiscardableSharedMemory(
  23     size_t size) {
  24   TRACE_EVENT1("renderer",
  25                "ChildDiscardableSharedMemoryManager::"
  26                "AllocateLockedDiscardableSharedMemory",
  27                "size",
  28                size);
  29
  30   base::SharedMemoryHandle handle = base::SharedMemory::NULLHandle();
  31   sender_->Send(
  32       new ChildProcessHostMsg_SyncAllocateLockedDiscardableSharedMemory(
  33           size, &handle));
  34   scoped_ptr<base::DiscardableSharedMemory> memory(
  35       new base::DiscardableSharedMemory(handle));
  36   CHECK(memory->Map(size));
  37   return memory.Pass();
  38 }
  39
  40 }  // namespace content