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Merged
evoskuil merged 1 commit into from
Aug 9, 2026
Merged

Add mmap tests. #890

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152 changes: 152 additions & 0 deletions test/memory/mmap.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -359,6 +359,158 @@ BOOST_AUTO_TEST_CASE(mmap__allocate__no_minimum_expansion__expected_capacity)
BOOST_REQUIRE(!instance.get_fault());
}

// Growth admission (headroom).
// ----------------------------------------------------------------------------
// An unsatisfiable headroom refuses every growth ask, which is the recoverable
// resource condition (space set, store intact) and never a store fault.

constexpr uint64_t unsatisfiable_headroom = 0x0001000000000000_u64;

BOOST_AUTO_TEST_CASE(mmap__allocate__unsatisfiable_headroom__eof)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.allocate(1000), map::eof);
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__allocate__unsatisfiable_headroom__space_no_fault)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.allocate(1000), map::eof);

BOOST_REQUIRE_NE(instance.get_space(), zero);
BOOST_REQUIRE(!instance.get_fault());
BOOST_REQUIRE(instance.is_loaded());
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__allocate__unsatisfiable_headroom__capacity_retained)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.capacity(), minimum);
BOOST_REQUIRE_EQUAL(instance.allocate(1000), map::eof);

BOOST_REQUIRE_EQUAL(instance.capacity(), minimum);
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
BOOST_REQUIRE(!instance.get_fault());
}

BOOST_AUTO_TEST_CASE(mmap__allocate__within_capacity_unsatisfiable_headroom__success)
{
constexpr auto minimum = 100_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.allocate(42), zero);
BOOST_REQUIRE(!instance.get_fault());
BOOST_REQUIRE_EQUAL(instance.get_space(), zero);
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__reload__after_headroom_refusal__clears_space)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.allocate(1000), map::eof);
BOOST_REQUIRE_NE(instance.get_space(), zero);

BOOST_REQUIRE(!instance.reload());
BOOST_REQUIRE_EQUAL(instance.get_space(), zero);
BOOST_REQUIRE(!instance.get_fault());
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__expand__unsatisfiable_headroom__false_no_fault)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE(!instance.expand(1000));
BOOST_REQUIRE_NE(instance.get_space(), zero);
BOOST_REQUIRE(!instance.get_fault());
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__reserve__unsatisfiable_headroom__false_no_fault)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, unsatisfiable_headroom });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE(!instance.reserve(1000));
BOOST_REQUIRE_NE(instance.get_space(), zero);
BOOST_REQUIRE(!instance.get_fault());
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
}

BOOST_AUTO_TEST_CASE(mmap__allocate__zero_headroom__growth_admitted)
{
constexpr auto minimum = 42_size;
constexpr auto rate = 50_size;
constexpr auto size = 1000_size;
const std::string file = TEST_PATH;
BOOST_REQUIRE(test::create(file));

map instance(file, { minimum, rate, 0 });
BOOST_REQUIRE(!instance.open());
BOOST_REQUIRE(!instance.load());
BOOST_REQUIRE_EQUAL(instance.allocate(size), zero);

constexpr auto capacity = size + to_half(size);
BOOST_REQUIRE_EQUAL(instance.capacity(), capacity);
BOOST_REQUIRE_EQUAL(instance.get_space(), zero);
BOOST_REQUIRE(!instance.unload());
BOOST_REQUIRE(!instance.close());
BOOST_REQUIRE(!instance.get_fault());
}

BOOST_AUTO_TEST_CASE(mmap__truncate__unloaded__failure)
{
const std::string file = TEST_PATH;
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