[omniORB] How to get file descriptor from a CORBA request?

[renny.koshy at rubixinfotech.com]

Alberto:

We've done something where we have single-threaded code.

1. Receive the requests as normal
2. Construct a "request structure", which contains a semaphore
3. Add the request to a queue [this must be done with mutex protection so
that the queue itself isn't accessed by two threads at once]
4. Wait for the semaphore to be signalled

In the main thread which is the "single thread" of our code
1. Check for requests in the queue
2. Process a requests
3. signal the sempahore on the request that was just processed
4. go back to 1.

Renny Koshy
President & CEO

--------------------------------------------
RUBIX Information Technologies, Inc.
www.rubixinfotech.com


                                                                           
             "Alberto Casado                                               
             Martín"                                                       
             <alberto.casado.m                                          To 
             artin at gmail.com>          "Tuyen Chau" <tchau at verano.com>     
             Sent by:                                                   cc 
             omniorb-list-boun         omniorb-list at omniorb-support.com    
             ces at omniorb-suppo                                     Subject 
             rt.com                    Re: [omniORB] How to get file       
                                       descriptor from a CORBA request?    
                                                                           
             09/30/2006 04:50                                              
             AM                                                            
                                                                           
                                                                           
                                                                           




Hello,

       Is there anyway we can force a single thread model in omniORB?  It
     will be a big job for us to
     make our code thread safe.

Yes, you can do that configuring your POA in SINGLE_THREAD_MODEL.


  12 CHAPTER 2. THE BASICS

       Multi-threading
       As omniORB is fully multithreaded, multiple threads may perform the
       same
       upcall to your implementation concurrently. It is up to your
       implementation
       to synchronise the threads' accesses to shared data. In our simple
       example,
       we have no shared data to protect so no thread synchronisation is
       necessary.
       Alternatively, you can create a POA which has the
       SINGLE_THREAD_MODEL
       Thread Policy. This guarantees that all calls to that POA are
       processed sequentially.


Cheers.
Alberto.

2006/9/29, Tuyen Chau <tchau at verano.com>:
  Duncan Grisby wrote:
  > The normal approach is to put something in per-thread state. You don't
  > want to put it on the servant object because multiple clients could
  call
  > a single servant concurrently.
  >
  > Cheers,
  >
  > Duncan
  This brings up another problem for us that we didn't anticipate.  Our
  implementation unfortunately is not thread safe.  Is there anyway we can
  force a single thread model in omniORB?  It will be a big job for us to
  make our code thread safe.

  Thanks for your response,
  Tuyen

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