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Date: Wed, 21 Apr 2021 12:38:04 +0100
From: Jonathan Wakely <jwakely@redhat.com>
To: Thomas Rodgers <rodgert@appliantology.com>
Cc: David Edelsohn <dje.gcc@gmail.com>, Jakub Jelinek <jakub@redhat.com>,
 gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org
Subject: Re: GCC 11.1 Release Candidate available from gcc.gnu.org
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On 20/04/21 22:12 -0700, Thomas Rodgers wrote:
>@@ -86,6 +88,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	}
>     }
> 
>+    _GLIBCXX_ALWAYS_INLINE bool
>+    _M_try_acquire() noexcept
>+    {
>+      for (;;)
>+	{
>+	  auto __err = sem_trywait(&_M_semaphore);
>+	  if (__err && (errno == EINTR))
>+	    continue;
>+	  else if (__err && (errno == EAGAIN))
>+	    return false;
>+	  else if (__err)
>+	    std::terminate();
>+	  else
>+	    break;
>+	}
>+      return true;
>+    }
>+
>     _GLIBCXX_ALWAYS_INLINE void
>     _M_release(std::ptrdiff_t __update) noexcept
>     {

Please just commit this part to trunk and gcc-11, not the macro
renaming (as that's been fixed by Jakub already).