| // 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 "base/memory/discardable_memory.h" |
| |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| |
| namespace base { |
| namespace { |
| |
| const struct TypeNamePair { |
| DiscardableMemoryType type; |
| const char* name; |
| } kTypeNamePairs[] = { |
| { DISCARDABLE_MEMORY_TYPE_ASHMEM, "ashmem" }, |
| { DISCARDABLE_MEMORY_TYPE_MAC, "mac" }, |
| { DISCARDABLE_MEMORY_TYPE_EMULATED, "emulated" }, |
| { DISCARDABLE_MEMORY_TYPE_MALLOC, "malloc" } |
| }; |
| |
| DiscardableMemoryType g_preferred_type = DISCARDABLE_MEMORY_TYPE_NONE; |
| |
| struct DefaultPreferredType { |
| DefaultPreferredType() : value(DISCARDABLE_MEMORY_TYPE_NONE) { |
| std::vector<DiscardableMemoryType> supported_types; |
| DiscardableMemory::GetSupportedTypes(&supported_types); |
| DCHECK(!supported_types.empty()); |
| value = supported_types[0]; |
| } |
| DiscardableMemoryType value; |
| }; |
| LazyInstance<DefaultPreferredType>::Leaky g_default_preferred_type = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| // static |
| DiscardableMemoryType DiscardableMemory::GetNamedType( |
| const std::string& name) { |
| for (size_t i = 0; i < arraysize(kTypeNamePairs); ++i) { |
| if (name == kTypeNamePairs[i].name) |
| return kTypeNamePairs[i].type; |
| } |
| |
| return DISCARDABLE_MEMORY_TYPE_NONE; |
| } |
| |
| // static |
| const char* DiscardableMemory::GetTypeName(DiscardableMemoryType type) { |
| for (size_t i = 0; i < arraysize(kTypeNamePairs); ++i) { |
| if (type == kTypeNamePairs[i].type) |
| return kTypeNamePairs[i].name; |
| } |
| |
| return "unknown"; |
| } |
| |
| // static |
| void DiscardableMemory::SetPreferredType(DiscardableMemoryType type) { |
| // NONE is a reserved value and not a valid default type. |
| DCHECK_NE(DISCARDABLE_MEMORY_TYPE_NONE, type); |
| |
| // Make sure this function is only called once before the first call |
| // to GetPreferredType(). |
| DCHECK_EQ(DISCARDABLE_MEMORY_TYPE_NONE, g_preferred_type); |
| |
| g_preferred_type = type; |
| } |
| |
| // static |
| DiscardableMemoryType DiscardableMemory::GetPreferredType() { |
| if (g_preferred_type == DISCARDABLE_MEMORY_TYPE_NONE) |
| g_preferred_type = g_default_preferred_type.Get().value; |
| |
| return g_preferred_type; |
| } |
| |
| // static |
| scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemory( |
| size_t size) { |
| return CreateLockedMemoryWithType(GetPreferredType(), size); |
| } |
| |
| } // namespace base |