Re: GCC 11.1 Release Candidate available from gcc.gnu.org

[Jonathan Wakely via Gcc-patches]

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).