[Ace-users] [ace-users] ACE_RW_Process_Mutex

[kul gupta]

Subject: ACE_RW_Process_Mutex in single writer and multiple readers

ACE VERSION: 5.5.8

HOST MACHINE and OPERATING SYSTEM:
Windows XP Professional and Enterprise Linux 5.0

Version 2002

TARGET MACHINE and OPERATING SYSTEM, if different from HOST:NO

COMPILER NAME AND VERSION (AND PATCHLEVEL):

Visual studio 2005

THE $ACE_ROOT/ace/config.h FILE

#include "ace/config-win32.h"   for windows

#include "ace/config-linux.h"   for linux

DOES THE PROBLEM AFFECT:

        COMPILATION?   NO

        LINKING?       NO

        EXECUTION?     YES

        OTHER

    SYNOPSIS:

Use of ACE_RW_Process_Mutex.I developed a very simple program which needs to
be extended for Multiple readers and single writer ( shared memory concept
using a Hash Map with allocator)

Even a single Reader and single writer are not getting
syncronized.Pleaseprovide with a sample program of
ACE_RW_Process_Mutex.



DESCRIPTION:

After having a look into ACE_ROOT/examples/Threads ,I implemented the
following code using ACE_RW_Process_Mutex. and run in both Windows and
linux5.0. But in both the cases the synchronization is not happening .

Yes I have tried with ACE_Process_Mutex.Its working Fine in Windows
and linux.I m attaching the code of ACE_Process_Mutex along with its
output  and also of ACE_RW_Process_Mutex along with its output

The Code is written as below  (WITH ACE_RW_Process_Mutex)

int ACE_TMAIN (int argc, ACE_TCHAR *argv[])

{

int count =0;

float ltime=0;

    ACE_RW_Process_Mutex m_RWMutex(ACE_TEXT("MyMutex"));

    if (agrc == 1)                  // For server which is writing

    {

        while (1)

        {

            if (m_RWMutex.acquire_write() == 0)

            {

                ltime = ::GetTickCount();

                ACE_OS::printf("Writer acquired...%d  at:
%f\n",count++,ltime);

                ACE_OS::sleep(2);

                ltime = ::GetTickCount();

                ACE_OS::printf("Writer releasing... ...%d  at:
%f\n",count++,ltime);

                m_RWMutex.release();

            }

        }

    }

    else                      //For Client which is reading

    {

        while (1)

        {

            if (m_RWMutex.acquire_read() == 0)

            {

               ltime = ::GetTickCount();

               ACE_OS::printf("Reader acquired... ...%d  at:
%f\n",count++,ltime);

                ACE_OS::sleep(2);

                ltime = ::GetTickCount();

                ACE_OS::printf("Reader releasing...%d  at:
%f\n",count++,ltime);

                m_RWMutex.release();

            }

        }

    }

    return 0;

}

output is like this(WITH ACE_RW_Process_Mutex):

Writer

writer acquired    0    at   88110592

writer released    0    at   88112592

writer acquired    1    at   88112592

writer released    1   at   88114592

writer acquired    2    at   88114592

writer released    2    at   88116592

writer acquired    3    at   88116592

writer released    3    at   88118592



Reader

Reader acquired   0     at   88112872

Reader released   0     at   88114872

Reader acquired   1     at   88114872

Reader released   1     at   88116872

Reader acquired   2     at   88116872

Reader released   2     at   88118872

Reader acquired   3     at   88118872





output is like this (WITH ACE_Process_Mutex):

Writer

writer acquired    0    at    88560984

writer released    0    at   88562984

writer acquired    1    at   88562984

writer released    1   at   88564984

writer acquired    2    at   88566984

writer released    2    at   88568984

writer acquired    3    at   88570984

writer released    3    at   88572984



Reader

Reader acquired   0     at   88564984

Reader released   0     at   88566984

Reader acquired   1     at   88568984

Reader released   1     at   88570984

Reader acquired   2     at   88572984

Reader released   2     at   88574984

Reader acquired   3     at   88576984

Reader released   3     at   88578984




On 3/3/08, Matthew Gillen <mgillen at bbn.com> wrote:
>
> kul gupta wrote:
> > After having a look into ACE_ROOT/examples/Threads ,I implemented the
> > following code using ACE_RW_Process_Mutex. and run in both Windows and
> > linux5.0. But in both the cases the synchronization is not happening .
>
> It would help if were more specific about what actually /is/
> happening.  Do
> you see the output messages in the wrong order?  Do you never see some
> output messages?
>
> Matt
>
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