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// Copyright (C) 2018 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-do run }
// { dg-options "-std=gnu++17 -pthread" }
// { dg-require-effective-target c++17 }
// { dg-require-effective-target pthread }
// { dg-require-gthreads "" }
#include <memory_resource>
#include <future>
#include <testsuite_allocator.h>
#include <testsuite_hooks.h>
void
test01()
{
__gnu_test::memory_resource test_mr;
std::pmr::synchronized_pool_resource smr(&test_mr);
const std::size_t largest_pool = smr.options().largest_required_pool_block;
auto do_alloc = [&smr](void*& p, size_t n) {
// perform some other allocations and deallocations on the same thread:
void* p2 = smr.allocate(n);
smr.deallocate(p2, n);
p2 = smr.allocate(n);
p = smr.allocate(n);
smr.deallocate(p2, n);
};
auto do_dealloc = [&smr](void* p, size_t n) { smr.deallocate(p, n); };
void* p1;
void* p2;
void* p3;
auto f1 = std::async(std::launch::async, do_alloc, std::ref(p1), 8);
auto f2 = std::async(std::launch::async, do_alloc, std::ref(p2), 64);
auto f3 = std::async(std::launch::async, do_alloc, std::ref(p3),
largest_pool* 2);
f1.get();
f2.get();
f3.get();
VERIFY( p1 != nullptr );
VERIFY( p2 != nullptr );
VERIFY( p3 != nullptr );
size_t nallocs = test_mr.number_of_active_allocations();
VERIFY( nallocs >= 4 );
// deallocate on different threads from allocation:
f1 = std::async(std::launch::async, do_dealloc, p1, 8);
f2 = std::async(std::launch::async, do_dealloc, p2, 64);
f1.get();
f2.get();
// No additional memory is allocated by deallocating on new threads:
VERIFY( test_mr.number_of_active_allocations() == nallocs );
// Deallocate large unpooled allocation:
f3 = std::async(std::launch::async, do_dealloc, p3, largest_pool * 2);
f3.get();
// The large allocation should have been returned upstream:
VERIFY( test_mr.number_of_active_allocations() == nallocs - 1 );
smr.release();
VERIFY( test_mr.number_of_active_allocations() == 0 );
}
int
main()
{
test01();
}
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