1 // Copyright (C) 2018-2019 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
eq(const std::pmr::pool_options & lhs,const std::pmr::pool_options & rhs)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
test01()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
test02()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
main()94 main()
95 {
96 test01();
97 test02();
98 }
99