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#include <kapi/devices.hpp>
#include <kstd/memory.hpp>
#include <kstd/string.hpp>
#include <catch2/catch_test_macros.hpp>
namespace
{
struct test_bus final : kapi::devices::bus
{
using kapi::devices::bus::bus;
};
struct test_device final : kapi::devices::device
{
using kapi::devices::device::device;
};
struct flagging_device final : kapi::devices::device
{
flagging_device(kstd::string const & name, bool & destroyed_flag)
: device{name}
, m_destroyed_flag{&destroyed_flag}
{}
~flagging_device() override
{
*m_destroyed_flag = true;
}
private:
bool * m_destroyed_flag;
};
} // namespace
SCENARIO("A bus shares ownership of its children, holding a weak link to its parent", "[devices][bus]")
{
GIVEN("A bus with one attached child device")
{
auto parent_bus = kstd::make_shared<test_bus>("bus_ownership_parent");
auto child = kstd::make_shared<test_device>("bus_ownership_child");
parent_bus->add_child(child);
THEN("the child is reachable through children()")
{
REQUIRE(parent_bus->children().size() == 1);
REQUIRE(parent_bus->children()[0]->name() == "bus_ownership_child");
}
THEN("the child's parent resolves back to the bus")
{
auto locked_parent = child->parent();
REQUIRE(locked_parent);
REQUIRE(locked_parent->name() == "bus_ownership_parent");
}
WHEN("the bus is destroyed while the caller still holds the child directly")
{
parent_bus.reset();
THEN("the child outlives the bus")
{
REQUIRE(child != nullptr);
}
THEN("the child's parent link no longer resolves")
{
REQUIRE(child->parent() == nullptr);
}
}
}
GIVEN("a bus that is the only thing keeping its child alive")
{
auto destroyed = false;
auto parent_bus = kstd::make_shared<test_bus>("bus_lifetime_parent");
parent_bus->add_child(kstd::make_shared<flagging_device>("bus_lifetime_child", destroyed));
WHEN("the bus is destroyed")
{
CHECK_FALSE(destroyed);
parent_bus.reset();
THEN("the child is destroyed along with it")
{
REQUIRE(destroyed);
}
}
}
}
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