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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/embedder/scoped_global_scenario_memory.h"
#include <memory>
#include <optional>
#include <utility>
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/shared_memory_mapper.h"
#include "base/memory/structured_shared_memory.h"
#include "base/types/pass_key.h"
#include "components/performance_manager/scenario_api/performance_scenario_memory.h"
#include "components/performance_manager/scenario_api/performance_scenarios.h"
#include "components/performance_manager/scenarios/browser_performance_scenarios.h"
#include "components/performance_manager/scenarios/performance_scenario_data.h"
namespace performance_manager {
ScopedGlobalScenarioMemory::ScopedGlobalScenarioMemory(
base::SharedMemoryMapper* mapper) {
auto state_ptr = std::make_unique<PerformanceScenarioData>(mapper);
if (!state_ptr->HasSharedState()) {
// Mapping failed. Create an invalid `read_only_mapping_` so that the
// PerformanceScenarioObserverList exists but does nothing.
read_only_mapping_.emplace(performance_scenarios::ScenarioScope::kGlobal,
base::ReadOnlySharedMemoryRegion());
return;
}
state_ptr->EnsureTracingTracks();
read_only_mapping_.emplace(
performance_scenarios::ScenarioScope::kGlobal,
state_ptr->shared_state().DuplicateReadOnlyRegion());
SetGlobalSharedScenarioState(base::PassKey<ScopedGlobalScenarioMemory>(),
std::move(state_ptr));
writable_global_memory_installed_ = true;
}
ScopedGlobalScenarioMemory::~ScopedGlobalScenarioMemory() {
if (writable_global_memory_installed_) {
SetGlobalSharedScenarioState(base::PassKey<ScopedGlobalScenarioMemory>(),
nullptr);
}
}
} // namespace performance_manager
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