1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10// TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed
11// UNSUPPORTED: availability-pmr-missing
12
13// <memory_resource>
14
15// class synchronized_pool_resource
16
17#include <memory_resource>
18#include <cassert>
19#include <memory> // std::align
20
21#include "count_new.h"
22#include "test_macros.h"
23
24static bool is_aligned_to(void* p, std::size_t alignment) {
25 void* p2 = p;
26 std::size_t space = 1;
27 void* result = std::align(align: alignment, size: 1, ptr&: p2, space&: space);
28 return (result == p);
29}
30
31int main(int, char**) {
32 globalMemCounter.reset();
33 std::pmr::pool_options opts{.max_blocks_per_chunk: 1, .largest_required_pool_block: 256};
34 auto sync1 = std::pmr::synchronized_pool_resource(opts, std::pmr::new_delete_resource());
35 std::pmr::memory_resource& r1 = sync1;
36
37 void* ret = r1.allocate(bytes: 8);
38 assert(ret != nullptr);
39 assert(is_aligned_to(ret, 8));
40 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkNewCalledGreaterThan(0));
41 int new_called = globalMemCounter.new_called;
42
43 // After deallocation, the pool for 8-byte blocks should have at least one vacancy.
44 r1.deallocate(p: ret, bytes: 8);
45 assert(globalMemCounter.new_called == new_called);
46 assert(globalMemCounter.checkDeleteCalledEq(0));
47
48 // This should return an existing block from the pool: no new allocations.
49 ret = r1.allocate(bytes: 8);
50 assert(ret != nullptr);
51 assert(is_aligned_to(ret, 8));
52 assert(globalMemCounter.new_called == new_called);
53 assert(globalMemCounter.checkDeleteCalledEq(0));
54
55 return 0;
56}
57

source code of libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp