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| 1 | +/** |
| 2 | + * @file test_pam_pmm_threadsafe.cpp |
| 3 | + * @brief Тесты потокобезопасности pam_pmm_state (Этап C, Issue #210). |
| 4 | + * |
| 5 | + * Проверяют, что std::mutex в pam_pmm_state защищает init/destroy/reset/save |
| 6 | + * от гонок при одновременном доступе из нескольких потоков. |
| 7 | + */ |
| 8 | + |
| 9 | +#include <catch2/catch_test_macros.hpp> |
| 10 | +#include <atomic> |
| 11 | +#include <thread> |
| 12 | +#include <vector> |
| 13 | + |
| 14 | +#include "pam_pmm.h" |
| 15 | + |
| 16 | +using namespace pjson; |
| 17 | + |
| 18 | +// ═══════════════════════════════════════════════════════════════════════════ |
| 19 | +// БАЗОВЫЕ ТЕСТЫ МЬЮТЕКСА В PAM_PMM_STATE |
| 20 | +// ═══════════════════════════════════════════════════════════════════════════ |
| 21 | + |
| 22 | +TEST_CASE( "pam_pmm_threadsafe: mutex exists in pam_pmm_state", "[pam_pmm][threadsafe]" ) |
| 23 | +{ |
| 24 | + // Проверяем, что pam_pmm_state содержит мьютекс (компилируется). |
| 25 | + pam_pmm_state state; |
| 26 | + std::lock_guard<std::mutex> lock( state.mtx ); |
| 27 | + REQUIRE_FALSE( state.initialized ); |
| 28 | +} |
| 29 | + |
| 30 | +TEST_CASE( "pam_pmm_threadsafe: concurrent is_initialized reads", "[pam_pmm][threadsafe]" ) |
| 31 | +{ |
| 32 | + pam_pmm_init( nullptr ); |
| 33 | + REQUIRE( pam_pmm_is_initialized() ); |
| 34 | + |
| 35 | + constexpr int NUM_THREADS = 8; |
| 36 | + std::atomic<int> success_count{ 0 }; |
| 37 | + std::vector<std::thread> threads; |
| 38 | + |
| 39 | + for ( int i = 0; i < NUM_THREADS; ++i ) |
| 40 | + { |
| 41 | + threads.emplace_back( |
| 42 | + [&success_count]() |
| 43 | + { |
| 44 | + if ( pam_pmm_is_initialized() ) |
| 45 | + success_count.fetch_add( 1 ); |
| 46 | + } ); |
| 47 | + } |
| 48 | + |
| 49 | + for ( auto& t : threads ) |
| 50 | + t.join(); |
| 51 | + |
| 52 | + REQUIRE( success_count.load() == NUM_THREADS ); |
| 53 | + |
| 54 | + pam_pmm_destroy(); |
| 55 | +} |
| 56 | + |
| 57 | +TEST_CASE( "pam_pmm_threadsafe: init and destroy are serialized", "[pam_pmm][threadsafe]" ) |
| 58 | +{ |
| 59 | + // Проверяем, что последовательные init/destroy не приводят к гонкам. |
| 60 | + constexpr int ITERATIONS = 10; |
| 61 | + |
| 62 | + for ( int i = 0; i < ITERATIONS; ++i ) |
| 63 | + { |
| 64 | + pam_pmm_init( nullptr ); |
| 65 | + REQUIRE( pam_pmm_is_initialized() ); |
| 66 | + pam_pmm_destroy(); |
| 67 | + REQUIRE_FALSE( pam_pmm_is_initialized() ); |
| 68 | + } |
| 69 | +} |
| 70 | + |
| 71 | +TEST_CASE( "pam_pmm_threadsafe: concurrent init/destroy with explicit state", "[pam_pmm][threadsafe]" ) |
| 72 | +{ |
| 73 | + // Используем явное состояние для проверки, что мьютекс защищает |
| 74 | + // одновременный доступ к одному и тому же state из разных потоков. |
| 75 | + pam_pmm_state state; |
| 76 | + |
| 77 | + constexpr int ITERATIONS = 5; |
| 78 | + constexpr int NUM_THREADS = 4; |
| 79 | + |
| 80 | + for ( int iter = 0; iter < ITERATIONS; ++iter ) |
| 81 | + { |
| 82 | + // Инициализируем. |
| 83 | + pam_pmm_init( state, nullptr ); |
| 84 | + REQUIRE( pam_pmm_is_initialized( state ) ); |
| 85 | + |
| 86 | + // Несколько потоков одновременно проверяют состояние. |
| 87 | + std::atomic<int> check_count{ 0 }; |
| 88 | + std::vector<std::thread> threads; |
| 89 | + |
| 90 | + for ( int i = 0; i < NUM_THREADS; ++i ) |
| 91 | + { |
| 92 | + threads.emplace_back( |
| 93 | + [&state, &check_count]() |
| 94 | + { |
| 95 | + // Каждый поток проверяет is_initialized через мьютекс. |
| 96 | + bool ok = pam_pmm_is_initialized( state ); |
| 97 | + if ( ok ) |
| 98 | + check_count.fetch_add( 1 ); |
| 99 | + } ); |
| 100 | + } |
| 101 | + |
| 102 | + for ( auto& t : threads ) |
| 103 | + t.join(); |
| 104 | + |
| 105 | + REQUIRE( check_count.load() == NUM_THREADS ); |
| 106 | + |
| 107 | + // Уничтожаем. |
| 108 | + pam_pmm_destroy( state ); |
| 109 | + REQUIRE_FALSE( pam_pmm_is_initialized( state ) ); |
| 110 | + } |
| 111 | +} |
| 112 | + |
| 113 | +TEST_CASE( "pam_pmm_threadsafe: reset is serialized", "[pam_pmm][threadsafe]" ) |
| 114 | +{ |
| 115 | + pam_pmm_init( nullptr ); |
| 116 | + |
| 117 | + // Создаём объект. |
| 118 | + auto& state = pam_pmm_global_state(); |
| 119 | + uintptr_t off = pam_pmm_create<int>( state, "test_threadsafe" ); |
| 120 | + REQUIRE( off != 0 ); |
| 121 | + |
| 122 | + // Reset через мьютекс. |
| 123 | + pam_pmm_reset( state ); |
| 124 | + REQUIRE( pam_pmm_is_initialized( state ) ); |
| 125 | + REQUIRE( pam_pmm_find( state, "test_threadsafe" ) == 0 ); |
| 126 | + |
| 127 | + pam_pmm_destroy( state ); |
| 128 | +} |
| 129 | + |
| 130 | +TEST_CASE( "pam_pmm_threadsafe: pam_pmm_state is not copyable due to mutex", "[pam_pmm][threadsafe]" ) |
| 131 | +{ |
| 132 | + // std::mutex делает pam_pmm_state некопируемым — это ожидаемое поведение. |
| 133 | + STATIC_REQUIRE_FALSE( std::is_copy_constructible<pam_pmm_state>::value ); |
| 134 | + STATIC_REQUIRE_FALSE( std::is_copy_assignable<pam_pmm_state>::value ); |
| 135 | +} |
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