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* [gcc/devel/gccgo] Implent C++20 std::atomic_flag::test
@ 2020-07-12 18:09 Ian Lance Taylor
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From: Ian Lance Taylor @ 2020-07-12 18:09 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:491ba663e05887c0353edf571be36e8f04183df3
commit 491ba663e05887c0353edf571be36e8f04183df3
Author: Ulrich Drepper <drepper@gmail.com>
Date: Tue May 12 07:37:09 2020 +0200
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.
Diff:
---
libstdc++-v3/ChangeLog | 8 ++++++++
libstdc++-v3/include/bits/atomic_base.h | 20 ++++++++++++++++++++
libstdc++-v3/include/std/version | 1 +
3 files changed, 29 insertions(+)
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index a2ff49d9e51..3264fd4c481 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -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)
diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index 87fe0bd6000..3b66b040976 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -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
{
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index c3a5bd26e63..c6bde2cfbda 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -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
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