Re: new module 'thread-optim'

[Paul Eggert]

On 8/9/20 2:44 AM, Bruno Haible wrote:
> To me, this variable '__libc_single_threaded' is not something that should
> be visible in source code
>    - because it is so low-level,
>    - because only one platform has it.

True enough, but how about suggesting that people write something like the 
following?

   bool mt = gl_multithreaded ();
   if (mt) gl_lock_lock (file_cleanup_list_lock);
   ...
   if (mt) gl_lock_unlock (file_cleanup_list_lock);

This is nearly as concise as the IF_MT_DECL and IF_MT macros, allows for further 
enhancements by builtin_expect etc., and avoids the macro hackery.