blob: 39c53e0d3c763d73e1689d08aa0c28492eb1852b [file] [log] [blame]
// 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 <stddef.h>
#include <stdint.h>
#include <functional>
#include "base/hash/hash.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 {
int id;
// Invalid ID is -1 to match semantics of base::AtomicSequenceNumber.
GenericSharedMemoryId() : id(-1) {}
explicit GenericSharedMemoryId(int id) : id(id) {}
GenericSharedMemoryId(const GenericSharedMemoryId& other) = default;
GenericSharedMemoryId& operator=(const GenericSharedMemoryId& other) =
bool is_valid() const { return id >= 0; }
bool operator==(const GenericSharedMemoryId& other) const {
return id ==;
bool operator<(const GenericSharedMemoryId& other) const {
return id <;
// Generates GUID which can be used to trace shared memory using its
// GenericSharedMemoryId.
GFX_EXPORT base::trace_event::MemoryAllocatorDumpGuid
uint64_t tracing_process_id,
GenericSharedMemoryId generic_shared_memory_id);
} // namespace gfx
namespace std {
template <>
struct hash<gfx::GenericSharedMemoryId> {
size_t operator()(gfx::GenericSharedMemoryId key) const {
return std::hash<int>()(;
template <typename Second>
struct hash<std::pair<gfx::GenericSharedMemoryId, Second>> {
size_t operator()(
const std::pair<gfx::GenericSharedMemoryId, Second>& pair) const {
return base::HashInts(, pair.second);
} // namespace std