monero/tests/unit_tests/mlocker.cpp

// Copyright (c) 2018, The Monero Project
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#include "gtest/gtest.h"

#include "misc_log_ex.h"
#include "mlocker.h"

#define BASE(data) (char*)(((uintptr_t)(data.get() + page_size - 1)) / page_size * page_size)

TEST(mlocker, distinct_1)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size > 0);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[8 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data), 1);
  epee::mlocker *m1 = new epee::mlocker(BASE(data) + 2 * page_size, 1);
  epee::mlocker *m2 = new epee::mlocker(BASE(data) + 3 * page_size, 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 3);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 3);
  delete m0;
  delete m1;
  delete m2;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, distinct_full_page)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size > 0);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[8 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data), page_size);
  epee::mlocker *m1 = new epee::mlocker(BASE(data) + 2 * page_size, page_size);
  epee::mlocker *m2 = new epee::mlocker(BASE(data) + 3 * page_size, page_size);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 3);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 3);
  delete m0;
  delete m1;
  delete m2;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, identical)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size >= 32);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[8 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data) + page_size, 32);
  epee::mlocker *m1 = new epee::mlocker(BASE(data) + page_size, 32);
  epee::mlocker *m2 = new epee::mlocker(BASE(data) + page_size, 32);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 3);
  delete m1;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 2);
  delete m0;
  delete m2;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, overlapping_small)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size >= 64);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[8 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data), 32);
  epee::mlocker *m1 = new epee::mlocker(BASE(data) + 16, 32);
  epee::mlocker *m2 = new epee::mlocker(BASE(data) + 8, 32);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 3);
  delete m1;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 2);
  delete m2;
  delete m0;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, multi_page)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size > 0);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[8 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data) + page_size, page_size * 3);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 3);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  epee::mlocker *m1 = new epee::mlocker(BASE(data) + page_size * 7, page_size);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 4);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 2);
  delete m0;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  delete m1;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, cross_page)
{
  const size_t page_size = epee::mlocker::get_page_size();
  ASSERT_TRUE(page_size > 32);
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[2 * page_size]};
  epee::mlocker *m0 = new epee::mlocker(BASE(data) + page_size - 1, 2);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 2);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  delete m0;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, redundant)
{
  const size_t page_size = epee::mlocker::get_page_size();
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  std::unique_ptr<char[]> data{new char[2 * page_size]};
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
  epee::mlocker *m0 = new epee::mlocker(BASE(data), 32);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  epee::mlocker *m1 = new epee::mlocker(BASE(data), 32);
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 2);
  delete m1;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  delete m0;
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}

TEST(mlocker, mlocked)
{
  const size_t base_pages = epee::mlocker::get_num_locked_pages();
  const size_t base_objects = epee::mlocker::get_num_locked_objects();
  {
    struct Foo { uint64_t u; };
    epee::mlocked<Foo> l;
    ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 1);
    ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 1);
  }
  ASSERT_EQ(epee::mlocker::get_num_locked_pages(), base_pages + 0);
  ASSERT_EQ(epee::mlocker::get_num_locked_objects(), base_objects + 0);
}