[Boost-users] synchronization problem

Subject: [Boost-users] synchronization problem
From: alev mutlu (koor230_at_[hidden])
Date: 2010-03-28 11:04:25

Hi all,
For the following code I want to stop early completing processes and wait
for the others at the point with  (world.barrier)();   statement.
But the problem is stop- and stop+ do interleave. Am I doing something wrong
with the synchronization, or there is something wrong with my code?

if (world.rank() == MASTER){
        m_mySize = n / world.size() + n % world.size();
        w_mySize = n / world.size();
        for(int p = 1; p < world.size(); p++){
            world.send(p, 1, w_mySize);
            world.send(p, 2, n);
        }
          relMyValues = new possibleClause[w_mySize];
          scatter(world, pC, relMyValues, w_mySize, 0);
      }
      else{
          world.recv(0, 1, w_mySize);
          relMyValues = new possibleClause[w_mySize];
          scatter(world, pC, relMyValues, w_mySize, 0);

      }

    for(i = 0; i < w_mySize; i++){
       //do something
    }

    cout << world.rank() << " stop - " << world.rank() << endl;
    (world.barrier)();
    cout << world.rank() << " stop + " << world.rank() << endl;

    if (world.rank() == MASTER){
          relAllValues = new possibleClause[n - n % world.size()];
          gather(world, relMyValues, w_mySize, relAllValues, 0);
    }
    else{
        world.recv(0, 2, n);
        gather(world, relMyValues, w_mySize, relAllValues, 0);
    }