libstdc++-v3/testsuite/20_util/unsynchronized_pool_resource/options.cc

   1 // Copyright (C) 2018-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20
  21 #include <memory_resource>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_allocator.h>
  24
  25 bool eq(const std::pmr::pool_options& lhs, const std::pmr::pool_options& rhs)
  26 {
  27   return lhs.max_blocks_per_chunk == rhs.max_blocks_per_chunk
  28     && lhs.largest_required_pool_block == rhs.largest_required_pool_block;
  29 }
  30
  31 void
  32 test01()
  33 {
  34   std::pmr::unsynchronized_pool_resource r0;
  35   const std::pmr::pool_options opts = r0.options();
  36   VERIFY( opts.max_blocks_per_chunk != 0 );
  37   VERIFY( opts.largest_required_pool_block != 0 );
  38
  39   std::pmr::unsynchronized_pool_resource r1(opts);
  40   const auto opts1 = r1.options();
  41   VERIFY( eq(opts, opts1) );
  42
  43   std::pmr::unsynchronized_pool_resource r2(std::pmr::pool_options{0, 0});
  44   const auto opts2 = r2.options();
  45   VERIFY( eq(opts, opts2) );
  46 }
  47
  48 void
  49 test02()
  50 {
  51   std::pmr::pool_options opts{0, 0};
  52   std::size_t num_allocs = 0;
  53
  54   __gnu_test::memory_resource test_mr;
  55
  56   std::pmr::unsynchronized_pool_resource r1(opts, &test_mr);
  57   opts = r1.options();
  58   // opts.largest_required_pool_block should be set to the block size of
  59   // the largest pool (this is a GNU extension). Confirm this by checking
  60   // that allocations larger than opts.largest_required_pool_block come
  61   // directly from the upstream allocator, test_mr, not from r1's pools.
  62
  63   // The following should result in a "large" allocation direct from upstream:
  64   (void) r1.allocate(opts.largest_required_pool_block + 1);
  65   num_allocs = test_mr.number_of_active_allocations();
  66   // This should result in another "large" allocation direct from upstream:
  67   (void) r1.allocate(opts.largest_required_pool_block + 1);
  68   // Which means the number of upstream allocations should have increased:
  69   VERIFY( test_mr.number_of_active_allocations() > num_allocs );
  70   r1.release();
  71
  72   // Repeat with a user-specified block size:
  73   opts.largest_required_pool_block = 64;
  74   std::pmr::unsynchronized_pool_resource r2(opts, &test_mr);
  75   opts = r2.options();
  76   (void) r2.allocate(opts.largest_required_pool_block + 1);
  77   num_allocs = test_mr.number_of_active_allocations();
  78   (void) r2.allocate(opts.largest_required_pool_block + 1);
  79   VERIFY( test_mr.number_of_active_allocations() > num_allocs );
  80   r2.release();
  81
  82   // Repeat with an odd user-specified block size:
  83   opts.largest_required_pool_block = 71;
  84   std::pmr::unsynchronized_pool_resource r3(opts, &test_mr);
  85   opts = r3.options();
  86   (void) r3.allocate(opts.largest_required_pool_block + 1);
  87   num_allocs = test_mr.number_of_active_allocations();
  88   (void) r3.allocate(opts.largest_required_pool_block + 1);
  89   VERIFY( test_mr.number_of_active_allocations() > num_allocs );
  90   r3.release();
  91 }
  92
  93 int
  94 main()
  95 {
  96   test01();
  97   test02();
  98 }