| // Copyright (C) 2018-2019 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++17" } |
| // { dg-do run { target c++17 } } |
| |
| #include <memory_resource> |
| #include <testsuite_hooks.h> |
| #include <testsuite_allocator.h> |
| |
| bool eq(const std::pmr::pool_options& lhs, const std::pmr::pool_options& rhs) |
| { |
| return lhs.max_blocks_per_chunk == rhs.max_blocks_per_chunk |
| && lhs.largest_required_pool_block == rhs.largest_required_pool_block; |
| } |
| |
| void |
| test01() |
| { |
| std::pmr::unsynchronized_pool_resource r0; |
| const std::pmr::pool_options opts = r0.options(); |
| VERIFY( opts.max_blocks_per_chunk != 0 ); |
| VERIFY( opts.largest_required_pool_block != 0 ); |
| |
| std::pmr::unsynchronized_pool_resource r1(opts); |
| const auto opts1 = r1.options(); |
| VERIFY( eq(opts, opts1) ); |
| |
| std::pmr::unsynchronized_pool_resource r2(std::pmr::pool_options{0, 0}); |
| const auto opts2 = r2.options(); |
| VERIFY( eq(opts, opts2) ); |
| } |
| |
| void |
| test02() |
| { |
| std::pmr::pool_options opts{0, 0}; |
| std::size_t num_allocs = 0; |
| |
| __gnu_test::memory_resource test_mr; |
| |
| std::pmr::unsynchronized_pool_resource r1(opts, &test_mr); |
| opts = r1.options(); |
| // opts.largest_required_pool_block should be set to the block size of |
| // the largest pool (this is a GNU extension). Confirm this by checking |
| // that allocations larger than opts.largest_required_pool_block come |
| // directly from the upstream allocator, test_mr, not from r1's pools. |
| |
| // The following should result in a "large" allocation direct from upstream: |
| (void) r1.allocate(opts.largest_required_pool_block + 1); |
| num_allocs = test_mr.number_of_active_allocations(); |
| // This should result in another "large" allocation direct from upstream: |
| (void) r1.allocate(opts.largest_required_pool_block + 1); |
| // Which means the number of upstream allocations should have increased: |
| VERIFY( test_mr.number_of_active_allocations() > num_allocs ); |
| r1.release(); |
| |
| // Repeat with a user-specified block size: |
| opts.largest_required_pool_block = 64; |
| std::pmr::unsynchronized_pool_resource r2(opts, &test_mr); |
| opts = r2.options(); |
| (void) r2.allocate(opts.largest_required_pool_block + 1); |
| num_allocs = test_mr.number_of_active_allocations(); |
| (void) r2.allocate(opts.largest_required_pool_block + 1); |
| VERIFY( test_mr.number_of_active_allocations() > num_allocs ); |
| r2.release(); |
| |
| // Repeat with an odd user-specified block size: |
| opts.largest_required_pool_block = 71; |
| std::pmr::unsynchronized_pool_resource r3(opts, &test_mr); |
| opts = r3.options(); |
| (void) r3.allocate(opts.largest_required_pool_block + 1); |
| num_allocs = test_mr.number_of_active_allocations(); |
| (void) r3.allocate(opts.largest_required_pool_block + 1); |
| VERIFY( test_mr.number_of_active_allocations() > num_allocs ); |
| r3.release(); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| } |