Re: [boost] [thread] RFC standard proposed mutex, read-write mutex, condition

From: David Abrahams (dave_at_[hidden])
Date: 2007-08-22 10:42:52

on Wed Aug 22 2007, Howard Hinnant <hinnant-AT-twcny.rr.com> wrote:

>>  "However if the external mutex is (or is layout compatible with) a
>>  pthread_mutex_t, then there is no need for the internal
>>  pthread_mutex_t. When one wants to wait, one simply waits on the
>>  external pthread_mutex_t with the internal pthread_cond_t."
>>
>> This smells a little fishy.  It seems to imply that pthreads can wait
>> on any old data type that happens to be layout-compatible with
>> pthread_mutex_t.  Is that really true?
>
> Perhaps the wording isn't precise enough.
>
> The intent is that on pthreads:

<snip explanation that doesn't mention layout-compatibility>

Sure.  But where does the layout-compatibility thing come in?  Your
example uses the native pthread types, not arbitrary types
layout-compatible with those.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com
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