| // Copyright (C) 2019-2023 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++2a" } |
| // { dg-do run { target c++2a } } |
| // { dg-add-options libatomic } |
| |
| #include <atomic> |
| #include <limits.h> |
| #include <testsuite_hooks.h> |
| |
| void |
| test01() |
| { |
| int value; |
| |
| { |
| const auto mo = std::memory_order_relaxed; |
| std::atomic_ref<int> a(value); |
| bool ok = a.is_lock_free(); |
| if constexpr (std::atomic_ref<int>::is_always_lock_free) |
| VERIFY( ok ); |
| a = 0; |
| VERIFY( a.load() == 0 ); |
| VERIFY( a.load(mo) == 0 ); |
| a.store(1); |
| VERIFY( a.load() == 1 ); |
| auto v = a.exchange(2); |
| VERIFY( a == 2 ); |
| VERIFY( v == 1 ); |
| v = a.exchange(3, mo); |
| VERIFY( a == 3 ); |
| VERIFY( v == 2 ); |
| |
| auto expected = a.load(); |
| while (!a.compare_exchange_weak(expected, 4, mo, mo)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 4 ); |
| VERIFY( expected == 3 ); |
| expected = 1; |
| ok = a.compare_exchange_weak(expected, 5, mo, mo); |
| VERIFY( !ok && a.load() == 4 && expected == 4 ); |
| ok = a.compare_exchange_strong(expected, 5, mo, mo); |
| VERIFY( ok && a.load() == 5 && expected == 4 ); |
| expected = 0; |
| ok = a.compare_exchange_strong(expected, 3, mo, mo); |
| VERIFY( !ok && a.load() == 5 && expected == 5 ); |
| |
| while (!a.compare_exchange_weak(expected, 4)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 4 && expected == 5 ); |
| expected = a.load(); |
| while (!a.compare_exchange_weak(expected, 6, mo)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 6 && expected == 4 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_weak(expected, -8); |
| VERIFY( !ok && a.load() == 6 && expected == 6 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_weak(expected, 8, mo); |
| VERIFY( !ok && a.load() == 6 && expected == 6 ); |
| |
| ok = a.compare_exchange_strong(expected, -6); |
| VERIFY( ok && a.load() == -6 && expected == 6 ); |
| expected = a.load(); |
| ok = a.compare_exchange_strong(expected, 7, mo); |
| VERIFY( ok && a.load() == 7 && expected == -6 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_strong(expected, 2); |
| VERIFY( !ok && a.load() == 7 && expected == 7 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_strong(expected, 2, mo); |
| VERIFY( !ok && a.load() == 7 && expected == 7 ); |
| |
| v = a.fetch_add(2); |
| VERIFY( v == 7 ); |
| VERIFY( a == 9 ); |
| v = a.fetch_add(-30, mo); |
| VERIFY( v == 9 ); |
| VERIFY( a == -21 ); |
| |
| v = a.fetch_sub(3); |
| VERIFY( v == -21 ); |
| VERIFY( a == -24 ); |
| v = a.fetch_sub(-41, mo); |
| VERIFY( v == -24 ); |
| VERIFY( a == 17 ); |
| |
| v = a.fetch_and(0x101); |
| VERIFY( v == 17 ); |
| VERIFY( a == 1 ); |
| a = 0x17; |
| v = a.fetch_and(0x23, mo); |
| VERIFY( v == 0x17 ); |
| VERIFY( a == 3 ); |
| |
| v = a.fetch_or(0x101); |
| VERIFY( v == 3 ); |
| VERIFY( a == 0x103 ); |
| v = a.fetch_or(0x23, mo); |
| VERIFY( v == 0x103 ); |
| VERIFY( a == 0x123 ); |
| |
| v = a.fetch_xor(0x101); |
| VERIFY( v == 0x123 ); |
| VERIFY( a == 0x022 ); |
| v = a.fetch_xor(0x123, mo); |
| VERIFY( v == 0x022 ); |
| VERIFY( a == 0x101 ); |
| |
| v = a++; |
| VERIFY( v == 0x101 ); |
| VERIFY( a == 0x102 ); |
| v = a--; |
| VERIFY( v == 0x102 ); |
| VERIFY( a == 0x101 ); |
| v = ++a; |
| VERIFY( v == 0x102 ); |
| VERIFY( a == 0x102 ); |
| v = --a; |
| VERIFY( v == 0x101 ); |
| VERIFY( a == 0x101 ); |
| |
| v = a += -10; |
| VERIFY( v == 247 ); |
| VERIFY( a == 247 ); |
| |
| v = a -= 250; |
| VERIFY( v == -3 ); |
| VERIFY( a == -3 ); |
| |
| a = 0x17; |
| v = a &= 0x102; |
| VERIFY( v == 2 ); |
| VERIFY( a == 2 ); |
| |
| v = a |= 0x101; |
| VERIFY( v == 0x103 ); |
| VERIFY( a == 0x103 ); |
| |
| v = a ^= 0x121; |
| VERIFY( v == 0x022 ); |
| VERIFY( a == 0x022 ); |
| } |
| |
| VERIFY( value == 0x022 ); |
| } |
| |
| void |
| test02() |
| { |
| unsigned short value; |
| |
| { |
| const auto mo = std::memory_order_relaxed; |
| std::atomic_ref<unsigned short> a(value); |
| bool ok = a.is_lock_free(); |
| if constexpr (std::atomic_ref<unsigned short>::is_always_lock_free) |
| VERIFY( ok ); |
| a = 0; |
| VERIFY( a.load() == 0 ); |
| VERIFY( a.load(mo) == 0 ); |
| a.store(1); |
| VERIFY( a.load() == 1 ); |
| auto v = a.exchange(2); |
| VERIFY( a == 2 ); |
| VERIFY( v == 1 ); |
| v = a.exchange(3, mo); |
| VERIFY( a == 3 ); |
| VERIFY( v == 2 ); |
| |
| auto expected = a.load(); |
| while (!a.compare_exchange_weak(expected, 4, mo, mo)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 4 ); |
| VERIFY( expected == 3 ); |
| expected = 1; |
| ok = a.compare_exchange_weak(expected, 5, mo, mo); |
| VERIFY( !ok && a.load() == 4 && expected == 4 ); |
| ok = a.compare_exchange_strong(expected, 5, mo, mo); |
| VERIFY( ok && a.load() == 5 && expected == 4 ); |
| expected = 0; |
| ok = a.compare_exchange_strong(expected, 3, mo, mo); |
| VERIFY( !ok && a.load() == 5 && expected == 5 ); |
| |
| while (!a.compare_exchange_weak(expected, 4)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 4 && expected == 5 ); |
| expected = a.load(); |
| while (!a.compare_exchange_weak(expected, 6, mo)) |
| { /* weak form can fail spuriously */ } |
| VERIFY( a.load() == 6 && expected == 4 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_weak(expected, -8); |
| VERIFY( !ok && a.load() == 6 && expected == 6 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_weak(expected, 8, mo); |
| VERIFY( !ok && a.load() == 6 && expected == 6 ); |
| |
| ok = a.compare_exchange_strong(expected, -6); |
| VERIFY( ok && a.load() == (unsigned short)-6 && expected == 6 ); |
| expected = a.load(); |
| ok = a.compare_exchange_strong(expected, 7, mo); |
| VERIFY( ok && a.load() == 7 && expected == (unsigned short)-6 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_strong(expected, 2); |
| VERIFY( !ok && a.load() == 7 && expected == 7 ); |
| expected = a.load() + 1; |
| ok = a.compare_exchange_strong(expected, 2, mo); |
| VERIFY( !ok && a.load() == 7 && expected == 7 ); |
| |
| v = a.fetch_add(2); |
| VERIFY( v == 7 ); |
| VERIFY( a == 9 ); |
| v = a.fetch_add(-30, mo); |
| VERIFY( v == 9 ); |
| VERIFY( a == (unsigned short)-21 ); |
| |
| v = a.fetch_sub(3); |
| VERIFY( v == (unsigned short)-21 ); |
| VERIFY( a == (unsigned short)-24 ); |
| v = a.fetch_sub((unsigned short)-41, mo); |
| VERIFY( v == (unsigned short)-24 ); |
| VERIFY( a == 17 ); |
| |
| v = a.fetch_and(0x21); |
| VERIFY( v == 17 ); |
| VERIFY( a == 1 ); |
| a = 0x17; |
| v = a.fetch_and(0x23, mo); |
| VERIFY( v == 0x17 ); |
| VERIFY( a == 3 ); |
| |
| v = a.fetch_or(0x21); |
| VERIFY( v == 3 ); |
| VERIFY( a == 0x23 ); |
| v = a.fetch_or(0x44, mo); |
| VERIFY( v == 0x23 ); |
| VERIFY( a == 0x67 ); |
| |
| v = a.fetch_xor(0x21); |
| VERIFY( v == 0x67 ); |
| VERIFY( a == 0x46 ); |
| v = a.fetch_xor(0x12, mo); |
| VERIFY( v == 0x46 ); |
| VERIFY( a == 0x54 ); |
| |
| v = a++; |
| VERIFY( v == 0x54 ); |
| VERIFY( a == 0x55 ); |
| v = a--; |
| VERIFY( v == 0x55 ); |
| VERIFY( a == 0x54 ); |
| v = ++a; |
| VERIFY( v == 0x55 ); |
| VERIFY( a == 0x55 ); |
| v = --a; |
| VERIFY( v == 0x54 ); |
| VERIFY( a == 0x54 ); |
| |
| v = a += -10; |
| VERIFY( v == 0x4a ); |
| VERIFY( a == 0x4a ); |
| |
| v = a -= 15; |
| VERIFY( v == 0x3b ); |
| VERIFY( a == 0x3b ); |
| |
| a = 0x17; |
| v = a &= 0x12; |
| VERIFY( v == 0x12 ); |
| VERIFY( a == 0x12 ); |
| |
| v = a |= 0x34; |
| VERIFY( v == 0x36 ); |
| VERIFY( a == 0x36 ); |
| |
| v = a ^= 0x12; |
| VERIFY( v == 0x24 ); |
| VERIFY( a == 0x24 ); |
| } |
| |
| VERIFY( value == 0x24 ); |
| } |
| void |
| test03() |
| { |
| int i = 0; |
| std::atomic_ref<int> a0(i); |
| std::atomic_ref<int> a1(i); |
| std::atomic_ref<int> a2(a0); |
| a0 = 42; |
| VERIFY( a1 == 42 ); |
| VERIFY( a2 == 42 ); |
| } |
| |
| void |
| test04() |
| { |
| int i = INT_MIN; |
| std::atomic_ref<int> a(i); |
| --a; |
| VERIFY( a == INT_MAX ); |
| ++a; |
| VERIFY( a == INT_MIN ); |
| a |= INT_MAX; |
| VERIFY( a == -1 ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| } |