Process synchronization from two application

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Hi Guys,

Lets say i have application and both are using one common resource lets say a text file,how can i synchronize these two application for exception.

Regards,
Tasu

Posted 28-Sep-13 20:38pm

tasumisra

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Sergey Alexandrovich Kryukov 29-Sep-13 2:46am

What does it mean, "synchronize for exception"?
—SA

tasumisra 29-Sep-13 12:18pm

not exactly exception..its kind of exception prevention

Sergey Alexandrovich Kryukov 29-Sep-13 22:49pm

It was your word about exception. Synchronization is not really prevention of exception, it is preventing something worse than exceptions. The code may work incorrectly without a single exception, so nothing would indicate incorrectness, and this can happen due to wrong or missing synchronization. Misuse of synchronization may cause deadlocks (among other bad things), and wrong synchronization or lack if it may cause such bad thing as race condition. Please read on those concepts, as knowing them is very important.
—SA

BillWoodruff 29-Sep-13 4:26am

By "synchronize" I assume you mean something more than preventing one application from accessing the file while it's open in the other application ... right ?

tasumisra 29-Sep-13 12:18pm

exactly...

Sergey Alexandrovich Kryukov 29-Sep-13 22:45pm

Preventing not the access (this is the goal of synchronization), but incorrect access due to unpredicted timing. Most usually, in the simplest case, it means accessing a resource by one thread at a time, but in many cases, the picture needs to be more complex.
I answered, please see.
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-09-28T20:51:00

You can use a named mutex: http://en.wikipedia.org/wiki/Mutual_exclusion[^].

As all processes are isolated and run in their separate memory spaces, you need some shared synchronization object. Such sharing is achieved through giving some objects identical names. Please see: http://msdn.microsoft.com/en-us/library/system.threading.mutex.aspx[^].

Use the constructors using the mutex name; it will allow them to act as an IPC device shared by both processes.
See also: http://en.wikipedia.org/wiki/Inter-process_communication[^].

—SA