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From Davi Arnaut <d...@haxent.com.br>
Subject Re: Regarding apr_file_writev() and locking...
Date Mon, 14 May 2007 13:46:50 GMT
Joe Orton wrote:
> On Mon, May 14, 2007 at 09:54:10AM -0300, Davi Arnaut wrote:
>> Joe Orton wrote:
>>> On Fri, May 11, 2007 at 10:38:01PM -0300, Davi Arnaut wrote:
>>>> The patches improves the locking interaction with buffering. But, quite
>>>> frankly, the unix file_io locking and buffering is a bit messed. There
>>>> is no clear indication which functions are protected by APR_XTHREAD,
>>>> checks for partial writes on flushing are missing, buffering and file
>>>> positioning don't play well together, et cetera.
>>> I don't disagree that the existing buffering/mutex stuff is a mess, but 
>>> nested mutexes are not available on all platforms, so they can't be 
>>> relied upon.
>> Pools also use nested mutexes. 
> Only in the APR_POOL_DEBUG code.

I missed that, sorry.

>> So, I guess those platforms need to be fixed. BTW, which platforms 
>> that use unix/file_io don't support nested mutexes?
> Anything which doesn't support PTHREAD_MUTEX_RECURSIVE: older Linuxes, 
> probably some BSDs; not sure about any of the more exotic Unixes.


Davi Arnaut

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