Incidentally -- I found my problem -- basic Unix system programming, I 
needed to seek back to the start of the area before attempting to unlock 
it.  D'oh!

Ranjan

Ranjan Bagchi wrote:

> Cool - I was playing with that call today, although I'm getting 
> occasional EDEADLK exceptions thrown though.  Is there an example of 
> correct use?
> What I'm doing (code isn't handy right now) is before writing to the 
> file, I get a write lock, write my bit, and then unlock the region.   
> Reading bits try to get a Read lock, and then unlock when they're done.
>
> I'm using | in_channel_of_descr| and out_channel_of_descr to do the 
> i/o -- is this a problem?
>
> Ranjan
>
>
> Shawn Wagner wrote:
>
>> On Tue, May 11, 2004 at 11:05:23AM -0700, Ranjan Bagchi wrote:
>>  
>>
>>> Hi --
>>>
>>> I'm writing some code which will end up executing concurrently on 
>>> several OS processes.  I'd like to serialize access to some specific 
>>> OS resources (for instance, writing to a single file).  The Unix 
>>> module doesn't appear to offer anything like a critical section or 
>>> an OS mutex.  Is there a preferred way to do this?
>>>   
>>
>>
>> File locking with Unix.lockf?
>>
>>
>>  
>>
>
>

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