source: tests/concurrent/barrier/order.cfa@ 06bdba4

//
// Cforall Version 1.0.0 Copyright (C) 2022 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// concurrent/barrier/order.cfa -- validates barriers the return value of
//                                 barrier block
//
// Author           : Thierry Delisle
// Created On       : Fri Apr 01 11:39:09 2022
// Last Modified By :
// Last Modified On :
// Update Count     :
//

// Test validates barrier and block return value by checking
// that no more than one thread gets the same return value

#include <concurrency/barrier.hfa>
#include <fstream.hfa>
#include <mutex_stmt.hfa>
#include <thread.hfa>

const unsigned NUM_LAPS = 173;
const unsigned NUM_THREADS = 11;

// The barrier we are testing
barrier bar = { NUM_THREADS };

// The return values of the previous generation.
volatile unsigned * generation;

thread Tester {};
void main( Tester & this ) {
        // Repeat a few times
        for(l; NUM_LAPS) {
                // Yield for chaos
                yield(prng(this, 10));

                // Block and what order we arrived
                unsigned ret = block(bar);

                // Check what was the last generation of that last thread in this position
                unsigned g = generation[ret];

                // Is it what we expect?
                if(g != l) {
                        // Complain that they are different
                        sout | "Gen" | l | ": Expeced generation at" | ret | "to be" | l | "was" | g;
                }

                // Mark the expected next generation
                generation[ret] = l+1;
        }
}

int main() {
        // Create the data ans zero it.
        volatile unsigned gen_data[NUM_THREADS];
        for(t; NUM_THREADS)
                gen_data[t] = 0;

        generation = gen_data;

        // Run the experiment
        processor p[4];
        {
                Tester testers[NUM_THREADS];
        }
        sout | "done";
}