Groups > comp.programming.threads > #1026

Re: Distributed Reader-Writer Mutex by Dmitry Vyukov

From	"aminer" <aminer@videotron.ca>
Newsgroups	comp.programming.threads, comp.programming
Subject	Re: Distributed Reader-Writer Mutex by Dmitry Vyukov
Date	2012-08-25 19:23 -0500
Organization	A noiseless patient Spider
Message-ID	<k1bmp5$fbb$1@dont-email.me> (permalink)
References	<k1bkhs$uk8$1@dont-email.me> <k1bmhr$e9n$1@dont-email.me>

Cross-posted to 2 groups.

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"aminer" <aminer@videotron.ca> wrote in message 
news:k1bmhr$e9n$1@dont-email.me...
>
> I wrote:
>> So i think you have to use a critical section around the for loop to be 
>> able to lock
>> all the rwlocks at the same time to avoid the deadlock problem..
>
>
> I mean  you have to use a critical section around the for loop to be able
> to lock all the rwlocks atomicly  to avoid the deadlock problem..


Sorry for my english: i mean atomically.



Thank you,
Amine Moulay Ramdne.



>
>
>
>
>
> Thank you,
> Amine Moulay Ramdane.
>
>
>
> "aminer" <aminer@videotron.ca> wrote in message 
> news:k1bkhs$uk8$1@dont-email.me...
>>
>>
>> Hello all;
>>
>> I have loolked at the Distributed Reader-Writer Mutex by Dmitry Vyukov, 
>> look at
>>
>> http://www.1024cores.net/home/lock-free-algorithms/reader-writer-problem/distributed-reader-writer-mutex
>>
>>
>> and i have looked at it and i think there is a problem with this method, 
>> cause look
>> at the write lock function:
>>
>> int         distr_rw_mutex_wrlock           (distr_rw_mutex_t* mtx)
>> {
>>    int                     i;
>>    for (i = 0; i != mtx->proc_count; i += 1)
>>        pthread_rwlock_wrlock(&mtx->cell[i].mtx);
>>    return 0;
>> }
>>
>>
>> What is wrong with it ? suppose two or more writers wants to lock this 
>> distributed rwlock
>> there is a possibility of a deadlock.
>>
>> So i think you have to use a critical section around the for loop to be 
>> able to lock
>> all the rwlocks at the same time to avoid the deadlock problem..
>>
>>
>> Am i correct or not ?
>>
>>
>> Thank you,
>> Amine Moulay Ramdane.
>>
>>
>>
>>
>>
>
>

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Thread

Distributed Reader-Writer Mutex by  Dmitry Vyukov "aminer" <aminer@videotron.ca> - 2012-08-25 18:45 -0500
  Re: Distributed Reader-Writer Mutex by  Dmitry Vyukov "aminer" <aminer@videotron.ca> - 2012-08-25 19:19 -0500
    Re: Distributed Reader-Writer Mutex by  Dmitry Vyukov "aminer" <aminer@videotron.ca> - 2012-08-25 19:23 -0500
  Re: Distributed Reader-Writer Mutex by  Dmitry Vyukov Patricia Shanahan <pats@acm.org> - 2012-08-25 16:47 -0700
    Re: Distributed Reader-Writer Mutex by  Dmitry Vyukov "aminer" <aminer@videotron.ca> - 2012-08-25 19:56 -0500

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