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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2016-2020, Intel Corporation */
/*
* obj_cpp_shared_mutex_posix.cpp -- cpp shared mutex test
*
*/
#include "pthread_common.hpp"
#include "unittest.hpp"
#include <libpmemobj++/persistent_ptr.hpp>
#include <libpmemobj++/pool.hpp>
#include <libpmemobj++/shared_mutex.hpp>
#include <libpmemobj/atomic_base.h>
#include <mutex>
#define LAYOUT "cpp"
namespace nvobj = pmem::obj;
namespace
{
/* pool root structure */
struct root {
nvobj::shared_mutex pmutex;
unsigned counter;
};
/* number of ops per thread */
const unsigned num_ops = 200;
/* the number of threads */
const unsigned num_threads = 30;
/*
* writer -- (internal) bump up the counter by 2
*/
void *
writer(void *arg)
{
auto proot = static_cast<nvobj::persistent_ptr<root> *>(arg);
for (unsigned i = 0; i < num_ops; ++i) {
std::lock_guard<nvobj::shared_mutex> lock((*proot)->pmutex);
++((*proot)->counter);
++((*proot)->counter);
}
return nullptr;
}
/*
* reader -- (internal) verify if the counter is even
*/
void *
reader(void *arg)
{
auto proot = static_cast<nvobj::persistent_ptr<root> *>(arg);
for (unsigned i = 0; i < num_ops; ++i) {
(*proot)->pmutex.lock_shared();
UT_ASSERTeq((*proot)->counter % 2, 0);
(*proot)->pmutex.unlock_shared();
}
return nullptr;
}
/*
* writer_trylock -- (internal) trylock bump the counter by 2
*/
void *
writer_trylock(void *arg)
{
auto proot = static_cast<nvobj::persistent_ptr<root> *>(arg);
for (;;) {
if ((*proot)->pmutex.try_lock()) {
--((*proot)->counter);
--((*proot)->counter);
(*proot)->pmutex.unlock();
break;
}
}
return nullptr;
}
/*
* reader_trylock -- (internal) trylock verify that the counter is even
*/
void *
reader_trylock(void *arg)
{
auto proot = static_cast<nvobj::persistent_ptr<root> *>(arg);
for (;;) {
if ((*proot)->pmutex.try_lock_shared()) {
UT_ASSERTeq((*proot)->counter % 2, 0);
(*proot)->pmutex.unlock_shared();
break;
}
}
return nullptr;
}
/*
* 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(PMEMrwlock), 1,
[](PMEMobjpool *pop, void *ptr, void *arg) -> int {
PMEMrwlock *mtx = static_cast<PMEMrwlock *>(ptr);
pmemobj_memset_persist(pop, mtx, 1, sizeof(*mtx));
return 0;
},
nullptr);
nvobj::shared_mutex *placed_mtx =
new (pmemobj_direct(raw_mutex)) nvobj::shared_mutex;
std::unique_lock<nvobj::shared_mutex> lck(*placed_mtx);
}
/*
* mutex_test -- (internal) launch worker threads to test the pshared_mutex
*/
template <typename Worker>
void
mutex_test(nvobj::pool<root> &pop, Worker writer, Worker reader)
{
const auto total_threads = num_threads * 2u;
pthread_t threads[total_threads];
auto proot = pop.root();
for (unsigned i = 0; i < total_threads; i += 2) {
ut_pthread_create(&threads[i], nullptr, writer, &proot);
ut_pthread_create(&threads[i + 1], nullptr, reader, &proot);
}
for (unsigned i = 0; i < total_threads; ++i)
ut_pthread_join(&threads[i], nullptr);
}
}
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<root> pop;
try {
pop = nvobj::pool<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);
auto expected = num_threads * num_ops * 2;
mutex_test(pop, writer, reader);
UT_ASSERTeq(pop.root()->counter, expected);
/* trylocks are not tested as exhaustively */
expected -= num_threads * 2;
mutex_test(pop, writer_trylock, reader_trylock);
UT_ASSERTeq(pop.root()->counter, expected);
/* pmemcheck related persist */
pmemobj_persist(pop.handle(), &(pop.root()->counter),
sizeof(pop.root()->counter));
pop.close();
}
int
main(int argc, char *argv[])
{
return run_test([&] { test(argc, argv); });
}
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