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

[Thomas Rodgers <trodgers@redhat.com>]

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Revised patch attached.

On Fri, Nov 5, 2021 at 4:46 PM Jonathan Wakely <jwakely.gcc@gmail.com>
wrote:

> On Fri, 5 Nov 2021 at 21:51, Jonathan Wakely via Libstdc++
> <libstdc++@gcc.gnu.org> wrote:
> >
> > OK, thanks.
>
> Actually, we should really have a test to verify it can be called on a
> const object. Please add something when you commit, it can be dumb and
> simple, it just needs to verify that it can be called.
>
>
> >
> >
> > On Fri, 5 Nov 2021 at 21:46, Thomas Rodgers via Libstdc++ <
> > libstdc++@gcc.gnu.org> wrote:
> >
> > >
> > >
>
>

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From 69737be7cda5328eb0f67c9725c3b691bcb6cb2f Mon Sep 17 00:00:00 2001
From: Thomas Rodgers <rodgert@twrodgers.com>
Date: Tue, 9 Nov 2021 09:42:49 -0800
Subject: [PATCH] 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()):
	Likewise.
	* testsuite/29_atomics/atomic/wait_notify/102994.cc:
	New test.
---
 libstdc++-v3/include/bits/atomic_base.h               |  2 +-
 libstdc++-v3/include/std/atomic                       |  4 ++--
 .../testsuite/29_atomics/atomic/wait_notify/102994.cc | 11 +++++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/102994.cc

diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index 9e18aadadaf..a104adc1a10 100644
--- 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 936dd50ba1c..c971b712ef6 100644
--- 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
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
index 00000000000..bc814a708aa
--- /dev/null
+++ b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/102994.cc
@@ -0,0 +1,11 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+// { dg-require-gthreads "" }
+
+#include <atomic>
+
+void
+test_it(const std::atomic<char*> &a, char*p)
+{
+  a.wait(p);
+}
-- 
2.31.1