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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.
#include "components/performance_manager/scenario_api/performance_scenario_memory.h"
#include <optional>
#include <utility>
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/structured_shared_memory.h"
#include "base/no_destructor.h"
#include "base/notreached.h"
#include "components/performance_manager/scenario_api/performance_scenario_observer.h"
#include "components/performance_manager/scenario_api/performance_scenarios.h"
namespace performance_scenarios {
namespace {
// Global pointers to the shared memory mappings.
scoped_refptr<RefCountedScenarioMapping>& MappingPtrForScope(
ScenarioScope scope) {
static base::NoDestructor<scoped_refptr<RefCountedScenarioMapping>>
current_process_mapping;
static base::NoDestructor<scoped_refptr<RefCountedScenarioMapping>>
global_mapping;
switch (scope) {
case ScenarioScope::kCurrentProcess:
return *current_process_mapping;
case ScenarioScope::kGlobal:
return *global_mapping;
}
NOTREACHED();
}
} // namespace
// TODO(crbug.com/365586676): Currently these are only mapped into browser and
// renderer processes. The global scenarios should also be mapped into utility
// processes.
ScopedReadOnlyScenarioMemory::ScopedReadOnlyScenarioMemory(
ScenarioScope scope,
base::ReadOnlySharedMemoryRegion region)
: scope_(scope) {
using SharedScenarioState = base::StructuredSharedMemory<ScenarioState>;
std::optional<SharedScenarioState::ReadOnlyMapping> mapping =
SharedScenarioState::MapReadOnlyRegion(std::move(region));
if (mapping.has_value()) {
MappingPtrForScope(scope_) =
base::MakeRefCounted<RefCountedScenarioMapping>(
std::move(mapping.value()));
}
// The ObserverList must be created after mapping the memory, because it reads
// the scenario state in its constructor.
PerformanceScenarioObserverList::CreateForScope(PassKey(), scope_);
}
ScopedReadOnlyScenarioMemory::~ScopedReadOnlyScenarioMemory() {
PerformanceScenarioObserverList::DestroyForScope(PassKey(), scope_);
MappingPtrForScope(scope_).reset();
}
scoped_refptr<RefCountedScenarioMapping> GetScenarioMappingForScope(
ScenarioScope scope) {
return MappingPtrForScope(scope);
}
} // namespace performance_scenarios
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