libstdc++: Make atomic<T*>::wait() const [PR102994]

This was an oversight in the original commit adding wait/notify
to atomic<T>.

libstdc++-v3/ChangeLog:

	PR libstdc++/102994
	* include/bits/atomic_base.h (__atomic_base<_PTp*>::wait()):
	Add const qualifier.
	* include/std/atomic (atomic<_Tp*>::wait(), atomic_wait()):
	Likewise.
	* testsuite/29_atomics/atomic/wait_notify/102994.cc:
	New test.

diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index 9e18aad..a104adc 100644 (file)
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -893,7 +893,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #if __cpp_lib_atomic_wait
       _GLIBCXX_ALWAYS_INLINE void
       wait(__pointer_type __old,
-          memory_order __m = memory_order_seq_cst) noexcept
+          memory_order __m = memory_order_seq_cst) const noexcept
       {
        std::__atomic_wait_address_v(&_M_p, __old,
                                     [__m, this]

diff --git a/libstdc++-v3/include/std/atomic b/libstdc++-v3/include/std/atomic
index 936dd50..9b827b4 100644 (file)
--- a/libstdc++-v3/include/std/atomic
+++ b/libstdc++-v3/include/std/atomic
@@ -646,9 +646,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
                                            __cmpexch_failure_order(__m));
       }
 
-#if __cpp_lib_atomic_wait 
+#if __cpp_lib_atomic_wait
     void
-    wait(__pointer_type __old, memory_order __m = memory_order_seq_cst) noexcept
+    wait(__pointer_type __old, memory_order __m = memory_order_seq_cst) const noexcept
     { _M_b.wait(__old, __m); }
 
     // TODO add const volatile overload
@@ -1434,12 +1434,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     inline void
-    atomic_notify_one(atomic<_Tp>* __a) noexcept
+    atomic_notify_one(const atomic<_Tp>* __a) noexcept
     { __a->notify_one(); }
 
   template<typename _Tp>
     inline void
-    atomic_notify_all(atomic<_Tp>* __a) noexcept
+    atomic_notify_all(const atomic<_Tp>* __a) noexcept
     { __a->notify_all(); }
 #endif // __cpp_lib_atomic_wait
 

diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/102994.cc b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/102994.cc
new file mode 100644 (file)
index 0000000..9d92ff9
--- /dev/null
+++ b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/102994.cc
@@ -0,0 +1,19 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+// { dg-require-gthreads "" }
+
+#include <atomic>
+
+void
+test1(const std::atomic<char*>& a, char* p)
+{
+  a.wait(p);
+}
+
+void
+test2(const std::atomic<int>* a, int v)
+{
+  std::atomic_wait(a, v);
+  std::atomic_notify_one(a);
+  std::atomic_notify_all(a);
+}