1 // Copyright (C) 2018-2020 Free Software Foundation, Inc.
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)
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.
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/>.
18 // { dg-options "-std=gnu++17" }
19 // { dg-do run { target c++17 } }
21 #include <memory_resource>
22 #include <testsuite_hooks.h>
23 #include <testsuite_allocator.h>
25 bool eq(const std::pmr::pool_options
& lhs
, const std::pmr::pool_options
& rhs
)
27 return lhs
.max_blocks_per_chunk
== rhs
.max_blocks_per_chunk
28 && lhs
.largest_required_pool_block
== rhs
.largest_required_pool_block
;
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 );
39 std::pmr::unsynchronized_pool_resource
r1(opts
);
40 const auto opts1
= r1
.options();
41 VERIFY( eq(opts
, opts1
) );
43 std::pmr::unsynchronized_pool_resource
r2(std::pmr::pool_options
{0, 0});
44 const auto opts2
= r2
.options();
45 VERIFY( eq(opts
, opts2
) );
51 std::pmr::pool_options opts
{0, 0};
52 std::size_t num_allocs
= 0;
54 __gnu_test::memory_resource test_mr
;
56 std::pmr::unsynchronized_pool_resource
r1(opts
, &test_mr
);
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.
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
);
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
);
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
);
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
);
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
);