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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERFORMANCE_MANAGER_SCENARIO_API_PERFORMANCE_SCENARIO_MEMORY_H_
#define COMPONENTS_PERFORMANCE_MANAGER_SCENARIO_API_PERFORMANCE_SCENARIO_MEMORY_H_
#include "base/component_export.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/shared_memory_safety_checker.h"
#include "base/types/pass_key.h"
#include "components/performance_manager/scenario_api/performance_scenario_memory_forward.h" // IWYU pragma: export
#include "components/performance_manager/scenario_api/performance_scenarios.h"
namespace performance_scenarios {
// The full scenario state to copy over shared memory.
#pragma clang diagnostic push
#pragma clang diagnostic error "-Wpadded"
struct COMPONENT_EXPORT(SCENARIO_API) ScenarioState {
base::subtle::SharedAtomic<LoadingScenario> loading;
base::subtle::SharedAtomic<InputScenario> input;
};
#pragma clang diagnostic pop
// A scoped object that maps shared memory for the scenario state into the
// current process as long as it exists.
class COMPONENT_EXPORT(SCENARIO_API) ScopedReadOnlyScenarioMemory {
public:
// Maps `region` into the current process, as a read-only view of the memory
// holding the scenario state for `scope`.
ScopedReadOnlyScenarioMemory(ScenarioScope scope,
base::ReadOnlySharedMemoryRegion region);
~ScopedReadOnlyScenarioMemory();
ScopedReadOnlyScenarioMemory(const ScopedReadOnlyScenarioMemory&) = delete;
ScopedReadOnlyScenarioMemory& operator=(const ScopedReadOnlyScenarioMemory&) =
delete;
private:
using PassKey = base::PassKey<ScopedReadOnlyScenarioMemory>;
ScenarioScope scope_;
};
// Returns a pointer to the shared memory mapping registered for `scope`, or
// nullptr if there isn't any.
COMPONENT_EXPORT(SCENARIO_API)
scoped_refptr<RefCountedScenarioMapping> GetScenarioMappingForScope(
ScenarioScope scope);
} // namespace performance_scenarios
#endif // COMPONENTS_PERFORMANCE_MANAGER_SCENARIO_API_PERFORMANCE_SCENARIO_MEMORY_H_
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