Re: [boost] [interprocess] locked mutex and process killed

Subject: Re: [boost] [interprocess] locked mutex and process killed
From: Vicente Botet Escriba (vicente.botet_at_[hidden])
Date: 2009-03-24 12:39:08

Edouard A. wrote:
> 
> On Mon, 23 Mar 2009 23:57:19 +0100, "vicente.botet"
> <vicente.botet_at_[hidden]> wrote:
>> Hi,
>> 
>> what happens when a process owning interprocess::mutex is killed? is the
>> mutex unlocked before the process dies?
> 
> After a quick look at the source code:
> 
> inline void interprocess_mutex::lock()
> {
>    if (pthread_mutex_lock(&m_mut) != 0) 
>       throw lock_exception();
> }
> 
> The answer to your question is "an exception will be thrown" since the
> call
> will return "EOWNERDEAD".
> 
> Generally speaking when a thread terminates while holding a mutex, the
> mutex is considered abandoned and shared resources protected by the mutex
> are in an undetermined state. Hope you like quantum physics. ;)
> 
> -- 
> 
> EA
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> 

Hi,

if this is the case, what do you think about adding a kind of resource
manager that will ensure all the shared resources are released (and in
particular the interprocess::mutex are unlocked) on a cleanup phase just
before diing?

Vicente
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