[Ffmpeg-devel] Network patch for MingW users
Michel Bardiaux
mbardiaux
Tue Feb 20 11:28:39 CET 2007
M?ns Rullg?rd wrote:
> Michel Bardiaux said:
>> M?ns Rullg?rd wrote:
>>> Michel Bardiaux said:
>>>> Fran?ois Revol wrote:
>>>> [snip]
>>>>
>>>>>>> +#ifdef __MINGW32__
>>>>>>> + init_winsock();
>>>>>>> +#endif
>>>>>> Aaaaiiiieeee! NO MORE OF THIS. PLEASE.
>>>>> Also that's totally definitely non threadsafe.
>>>> Why? AFAIK WSAStartup is threadsafe. See e.g.
>>>> http://www.tangentsoft.net/wskfaq/
>>> Of more interest is what happens if WSAStartup() is called more than once.
>>> Likewise for WSACleanup()
>>>
>> What do you mean by that? That WSAStartup should not be called more than
>> once? It can.
>
> Good. I wasn't sure. Do calls to WSAStartup/WSACleanup nest properly too?
>
Not sure what you mean by 'nest'. The MS docs state that for each
WSAStartup there must be exactly one WSACleanup, but only the last one
will actually cleanup anything. In my experience, as long as you have
your own finalizers for sockets, you can omit WSACleanup without any
harm done. Of course, I dont make any promises about advanced stuff :-(
like DDE/RPC/OLE/...
--
Michel Bardiaux
R&D Director
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