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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/serialization/test/test_singleton_plain.cpp | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/serialization/test/test_singleton_plain.cpp')
-rw-r--r-- | src/boost/libs/serialization/test/test_singleton_plain.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/boost/libs/serialization/test/test_singleton_plain.cpp b/src/boost/libs/serialization/test/test_singleton_plain.cpp new file mode 100644 index 000000000..7c3061415 --- /dev/null +++ b/src/boost/libs/serialization/test/test_singleton_plain.cpp @@ -0,0 +1,77 @@ +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// test_singleton_plain.cpp: +// Test the singleton class for a "plain" singleton (used as singleton<Foo>) +// +// - is_destroyed returns false when singleton is active or uninitialized +// - is_destroyed returns true when singleton is destructed +// - the singleton is eventually destructed (no memory leak) + +// (C) Copyright 2018 Alexander Grund +// Use, modification and distribution is subject to the Boost Software +// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) + +#include "test_tools.hpp" +#include <boost/serialization/singleton.hpp> +#include <boost/preprocessor/stringize.hpp> +#include <stdexcept> + +// Can't use BOOST_TEST because: +// a) destructors are called after program exit +// b) This is intended to be used by shared libraries too which would then need their own report_errors call +// We halso have to disable the Wterminate warning as we call this from dtors +// C++ will terminate the program in such cases which is OK here +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wterminate" +#define THROW_ON_FALSE(cond) if(!(cond)) throw std::runtime_error(__FILE__ "(" BOOST_PP_STRINGIZE(__LINE__) ") Assertion failed: " #cond) + +// Enum to designate the state of the singletonized instances +enum ConstructionState{CS_UNINIT, CS_INIT, CS_DESTROYED}; + +// We need another singleton to check for the destruction of the singletons at program exit +// We don't need all the magic for shared library anti-optimization and can keep it very simple +struct controller{ + static controller& getInstance(){ + static controller instance; + return instance; + } + ConstructionState state; +private: + controller() { + state = CS_UNINIT; + } + ~controller(); +}; + +// A simple class that sets its construction state in the controller singleton +struct Foo{ + Foo(): i(42) { + // access controller singleton. Therefore controller will be constructed before this + THROW_ON_FALSE(controller::getInstance().state == CS_UNINIT); + controller::getInstance().state = CS_INIT; + } + ~Foo() { + // Because controller is constructed before this, it will be destructed AFTER this. Hence controller is still valid + THROW_ON_FALSE(controller::getInstance().state == CS_INIT); + controller::getInstance().state = CS_DESTROYED; + } + // Volatile to prevent compiler optimization from removing this + volatile int i; +}; + +controller::~controller() { + // If this fails, the singletons were not freed and memory is leaked + THROW_ON_FALSE(state == CS_DESTROYED); + // If this fails, then the destroyed flag is not set and one may use a deleted instance if relying on this flag + THROW_ON_FALSE(boost::serialization::singleton<Foo>::is_destroyed()); +} + +int +test_main( int /* argc */, char* /* argv */[] ) +{ + // Check if the singleton is alive and use it + BOOST_CHECK(!boost::serialization::singleton<Foo>::is_destroyed()); + + BOOST_CHECK(boost::serialization::singleton<Foo>::get_const_instance().i == 42); + return EXIT_SUCCESS; +} |