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Implent C++20 std::atomic_flag::test 

* include/bits/atomic_base.h (atomic_flag): Implement test member
        function.
        * include/std/version: Define __cpp_lib_atomic_flag_test.
        * testsuite/29_atomics/atomic_flag/test/explicit.cc: New file.
        * testsuite/29_atomics/atomic_flag/test/implicit.cc: New file.
This commit is contained in:
Ulrich Drepper 2020-05-12 07:37:09 +02:00
parent 3ebd168b44
commit 491ba663e0
3 changed files with 29 additions and 0 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,11 @@
2020-05-08 Ulrich Drepper <drepper@redhat.com>
* include/bits/atomic_base.h (atomic_flag): Implement test member
function.
* include/std/version: Define __cpp_lib_atomic_flag_test.
* testsuite/29_atomics/atomic_flag/test/explicit.cc: New file.
* testsuite/29_atomics/atomic_flag/test/implicit.cc: New file.
2020-05-07 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/94971 (partial)

20
libstdc++-v3/include/bits/atomic_base.h
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@ -208,6 +208,26 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return __atomic_test_and_set (&_M_i, int(__m));
}
#if __cplusplus > 201703L
#define __cpp_lib_atomic_flag_test 201907L
_GLIBCXX_ALWAYS_INLINE bool
test(memory_order __m = memory_order_seq_cst) noexcept
{
__atomic_flag_data_type __v;
__atomic_load(&_M_i, &__v, int(__m));
return __v == __GCC_ATOMIC_TEST_AND_SET_TRUEVAL;
}
_GLIBCXX_ALWAYS_INLINE bool
test(memory_order __m = memory_order_seq_cst) volatile noexcept
{
__atomic_flag_data_type __v;
__atomic_load(&_M_i, &__v, int(__m));
return __v == __GCC_ATOMIC_TEST_AND_SET_TRUEVAL;
}
#endif // C++20
_GLIBCXX_ALWAYS_INLINE void
clear(memory_order __m = memory_order_seq_cst) noexcept
{

1
libstdc++-v3/include/std/version
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@ -164,6 +164,7 @@
#if __cplusplus > 201703L
// c++2a
#define __cpp_lib_atomic_flag_test 201907L
#define __cpp_lib_atomic_float 201711L
#define __cpp_lib_atomic_ref 201806L
#define __cpp_lib_atomic_value_initialization 201911L