[vlc-devel] [PATCH 08/18] Add missing getaddrinfo(), freeaddrinfo(), getnameinfo() and gai_strerror() for OS/2

[KO Myung-Hun]

Rémi Denis-Courmont wrote:
>    Hello,
> 
> On Friday 21 October 2011, KO Myung-Hun wrote:
>> Rémi Denis-Courmont wrote:
>>> Le jeudi 20 octobre 2011 15:30:15 KO Myung-Hun, vous avez écrit :
>>>> ---
>>>>
>>>>  include/vlc_network.h     |   33 +++++
>>>>  src/network/getaddrinfo.c |  334
>>>>
>>>> +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 367
>>>> insertions(+), 0 deletions(-)
>>>
>>> This code seems to be ripped from some old crap that I wrote years ago.
>>> Unfortunately, that implementation of getaddrinfo() assumes that
>>> gethostbyname() and gethostbyaddr() are thread-safe. I believe this is
>>> the case on Winsock 2 / Windows 9x which this code was aimed at.
>>
>> I've confirmed that gethostbyname() and gethostbyaddr() uses static dat,
>> so they are not thread-safe.
> 
> getaddrinfo() and getnameinfo() are supposed to be thread-safe (as they are 
> specified by IETF and POSIX), and VLC assumes they are.
> 
> On Windows, I think gethostbyname() returns data from thread-local storage, so 
> it is thread-safe. But this is an exception.
> 

With some more tests, I could know that gethostbyname()on OS/2 also had
no effect on other threads even though it is using a static data. Maybe
it also uses TLS. Anyway, it is thread-safe on OS/2 as well.

-- 
KO Myung-Hun

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