Re: [Boost-users] Using boost interprocess file_lock.timed_lock

Subject: Re: [Boost-users] Using boost interprocess file_lock.timed_lock
From: Bill Moo (cppsysdev_at_[hidden])
Date: 2011-07-30 03:58:49

On Fri, Jul 29, 2011 at 8:42 AM, <Viatcheslav.Sysoltsev_at_[hidden]> wrote:

>  Well spotted Colin thank you for taking the time to reply, but in my real
>> code i was incremented. I supplied this pseudo code to demonstrate how I
>> was
>> using the library just in case my usage was incorrect.
>>
> Have you missed maybe an *other* important detail in your pseudocode? If
> you really want help, provide small working example demonstrating your
> problem. Try it with reference compiler (msvc/gcc) to make sure it is not a
> compiler issue.
>
>
 I simply can understand why this doesn't work. I am using 64 bit builds of
>>
> Don't hurry
>
Hi, I appreciate the example was useless and of course missing the
timed_lock request, so apologies for wasting your time. I have now provided
a complete example as requested,  as a Win32 console app built in x64.
However, I am unable to test on any compiler other the Intel as I do not
have the applicable libraries, but I suspect this may not be a compiler
issue. I suspect the real problem lies between the seat and the keyboard.
Not to sure what you meant by "Don't hurry" but I suspect there may be an
odour or urine in the air.

#include "stdafx.h"

#include <iostream>

#include <fstream>

#include <boost/date_time/posix_time/posix_time.hpp>

#include <boost/interprocess/exceptions.hpp>

#include <boost/interprocess/sync/file_lock.hpp>

using namespace boost::interprocess ;

using namespace boost::posix_time ;

int _tmain(int argc, _TCHAR* argv[])

{

std::string m_FileName("./locktest.txt") ;

std::ofstream os ;

os.open(m_FileName.c_str(), std::ios_base::out | std::ios_base::binary |
std::ios_base::app) ;

try

{

if (os.is_open())

{

file_lock fileLock(m_FileName.c_str()) ;

ptime pt(second_clock::local_time()) ;

os.setf(std::ios::fixed, std::ios::floatfield) ;

os.precision(3) ;

if (fileLock.timed_lock(pt += seconds(5)))

{

try

{

// Do rows

for (int o = 0; o < 48; o++)

{

os << "This is row " << o << " of 48" << " and this is just text" << "\n" ;

// Do columns

for (int i = 0; i < 51; i++)

{

os << i << "\t" ;

}

}

fileLock.unlock() ;

}

catch (interprocess_exception& e)

{

std::cout << e.what() ;

}

catch (std::ofstream::failure e)

{

std::cout << e.what() ;

}

}

else

{

std::cout << "No lock on file!" ;

}

os.close() ;

}

else

{

std::cout << "File not opened!" ;

}

}

catch (std::exception& e)

{

std::cout << e.what() ;

}

std::cout << "Press a key to close." ;

std::cin.get() ;

return 0 ;

}

Thank you.

-- 
Bill