| // 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. |
| |
| #ifndef UI_GFX_GENERIC_SHARED_MEMORY_ID_H_ |
| #define UI_GFX_GENERIC_SHARED_MEMORY_ID_H_ |
| |
| #include "base/trace_event/memory_allocator_dump.h" |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| |
| // Defines an ID type which is used across all types of shared memory |
| // allocations in content/. This ID type is in ui/gfx, as components outside |
| // content/ may need to hold an ID (but should not generate one). |
| class GFX_EXPORT GenericSharedMemoryId { |
| public: |
| int id; |
| |
| // Invalid ID is -1 to match semantics of base::StaticAtomicSequenceNumber. |
| GenericSharedMemoryId() : id(-1) {} |
| explicit GenericSharedMemoryId(int id) : id(id) {} |
| GenericSharedMemoryId(const GenericSharedMemoryId& other) = default; |
| GenericSharedMemoryId& operator=(const GenericSharedMemoryId& other) = |
| default; |
| |
| bool operator==(const GenericSharedMemoryId& other) const { |
| return id == other.id; |
| } |
| |
| bool operator<(const GenericSharedMemoryId& other) const { |
| return id < other.id; |
| } |
| }; |
| |
| // Generates GUID which can be used to trace shared memory using its |
| // GenericSharedMemoryId. |
| GFX_EXPORT base::trace_event::MemoryAllocatorDumpGuid |
| GetGenericSharedMemoryGUIDForTracing( |
| uint64_t tracing_process_id, |
| GenericSharedMemoryId generic_shared_memory_id); |
| |
| } // namespace gfx |
| |
| namespace BASE_HASH_NAMESPACE { |
| template <> |
| struct hash<gfx::GenericSharedMemoryId> { |
| size_t operator()(gfx::GenericSharedMemoryId key) const { |
| return BASE_HASH_NAMESPACE::hash<int>()(key.id); |
| } |
| }; |
| } // namespace BASE_HASH_NAMESPACE |
| |
| #endif // UI_GFX_GENERIC_SHARED_MEMORY_ID_H_ |