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// 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_