[PATCH] libstdc++: Add C++2a synchronization support

[Jonathan Wakely]

On 23/11/20 18:31 +0000, Jonathan Wakely wrote:
>On 22/11/20 13:37 +0000, Jonathan Wakely via Libstdc++ wrote:
>>On Sun, 22 Nov 2020, 12:29 Iain Sandoe, <idsandoe@googlemail.com> wrote:
>>
>>>thanks for looking at this over the weekend.
>>>
>>>Jonathan Wakely via Gcc-patches <gcc-patches@gcc.gnu.org> wrote:
>>>
>>>> On Sat, 21 Nov 2020 at 23:55, David Edelsohn via Libstdc++
>>>> <libstdc++@gcc.gnu.org> wrote:
>>>>> I am seeing 93 new libstdc++ failures on AIX, even after Jonathan's
>>>>> fixes.  And a few c++ failures with similar symptoms.  I'm not certain
>>>>> that it is due to this patch, but it's the likely suspect.
>>>> Yes, it's that patch.
>>>>
>>>> This should fix most of those errors, but I haven't finished testing
>>>> it, and can't commit it now anyway.
>>>> <patch.txt>
>>>
>>>with r11-5235 + this patch there are still quite a few fails on Darwin -
>>>but
>>>all seem to be the same ( so maybe only problem ;) ):
>>>  “sem_timedwait was not declared in this scope”.
>>>
>>>It looks like the semaphore header is optional in SUSv3 (AFAIK that’s still
>>>the claimed edition for Darwin) - and although Darwin has the semaphore
>>>header, it doesn’t seem to have an impl. of sem_timedwait.
>>>
>>>just:
>>>int sem_trywait(sem_t *);
>>>int sem_wait(sem_t *) ;
>>>
>>
>>
>>It probably depends on the _POSIX_TIMEOUTS option which MacOS doesn't
>>support (optional in POSIX 2001, but not 2008).
>
>Hopefully this fixes it, but I haven't tested it on darwin, only
>linux, aix and solaris.
>
>Committed.

With the patch this time ...


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