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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2016-2020, Intel Corporation */
/*
* obj_cpp_mutex.cpp -- cpp mutex test
*/
#include "unittest.hpp"
#include <libpmemobj++/mutex.hpp>
#include <libpmemobj++/persistent_ptr.hpp>
#include <libpmemobj++/pool.hpp>
#include <libpmemobj/atomic_base.h>
#include <mutex>
#include <thread>
#define LAYOUT "cpp"
namespace nvobj = pmem::obj;
namespace
{
/* pool root structure */
struct root {
nvobj::mutex pmutex;
unsigned counter;
};
/* number of ops per thread */
const unsigned num_ops = 200;
/* the number of threads */
const unsigned num_threads = 30;
/*
* increment_pint -- (internal) test the mutex with an std::lock_guard
*/
void
increment_pint(nvobj::persistent_ptr<struct root> proot)
{
for (unsigned i = 0; i < num_ops; ++i) {
std::lock_guard<nvobj::mutex> lock(proot->pmutex);
(proot->counter)++;
}
}
/*
* decrement_pint -- (internal) test the mutex with an std::unique_lock
*/
void
decrement_pint(nvobj::persistent_ptr<struct root> proot)
{
std::unique_lock<nvobj::mutex> lock(proot->pmutex);
for (unsigned i = 0; i < num_ops; ++i)
--(proot->counter);
lock.unlock();
}
/*
* trylock_test -- (internal) test the trylock implementation
*/
void
trylock_test(nvobj::persistent_ptr<struct root> proot)
{
for (;;) {
if (proot->pmutex.try_lock()) {
(proot->counter)++;
proot->pmutex.unlock();
return;
}
}
}
/*
* mutex_zero_test -- (internal) test the zeroing constructor
*/
void
mutex_zero_test(nvobj::pool<struct root> &pop)
{
PMEMoid raw_mutex;
pmemobj_alloc(
pop.handle(), &raw_mutex, sizeof(PMEMmutex), 1,
[](PMEMobjpool *pop, void *ptr, void *) -> int {
PMEMmutex *mtx = static_cast<PMEMmutex *>(ptr);
pmemobj_memset_persist(pop, mtx, 1, sizeof(*mtx));
return 0;
},
nullptr);
nvobj::mutex *placed_mtx = new (pmemobj_direct(raw_mutex)) nvobj::mutex;
std::unique_lock<nvobj::mutex> lck(*placed_mtx);
}
/*
* mutex_test -- (internal) launch worker threads to test the pmutex
*/
template <typename Worker>
void
mutex_test(nvobj::pool<struct root> &pop, const Worker &function)
{
std::thread threads[num_threads];
nvobj::persistent_ptr<struct root> proot = pop.root();
for (unsigned i = 0; i < num_threads; ++i)
threads[i] = std::thread(function, proot);
for (unsigned i = 0; i < num_threads; ++i)
threads[i].join();
}
void
test_stack()
{
/* mutex is not allowed outside of pmem */
try {
nvobj::mutex stack_mutex;
UT_ASSERT(0);
} catch (pmem::lock_error &le) {
} catch (...) {
UT_ASSERT(0);
}
}
void
test_error_handling(nvobj::pool<root> &pop)
{
nvobj::persistent_ptr<root> proot = pop.root();
proot->pmutex.lock();
/* try_locking already taken lock fails with false */
UT_ASSERT(proot->pmutex.try_lock() == false);
proot->pmutex.unlock();
}
}
static void
test(int argc, char *argv[])
{
if (argc != 2)
UT_FATAL("usage: %s file-name", argv[0]);
const char *path = argv[1];
nvobj::pool<struct root> pop;
try {
pop = nvobj::pool<struct root>::create(
path, LAYOUT, PMEMOBJ_MIN_POOL, S_IWUSR | S_IRUSR);
} catch (pmem::pool_error &pe) {
UT_FATAL("!pool::create: %s %s", pe.what(), path);
}
mutex_zero_test(pop);
mutex_test(pop, increment_pint);
UT_ASSERTeq(pop.root()->counter, num_threads * num_ops);
mutex_test(pop, decrement_pint);
UT_ASSERTeq(pop.root()->counter, 0);
mutex_test(pop, trylock_test);
UT_ASSERTeq(pop.root()->counter, num_threads);
/* pmemcheck related persist */
pmemobj_persist(pop.handle(), &(pop.root()->counter),
sizeof(pop.root()->counter));
test_stack();
test_error_handling(pop);
pop.close();
}
int
main(int argc, char *argv[])
{
return run_test([&] { test(argc, argv); });
}
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