source: doc/theses/colby_parsons_MMAth/benchmarks/channels/cfa/churn.cfa@ bb7422a

#include <locks.hfa>
#include <fstream.hfa>
#include <stdio.h>
#include <string.h>
#include "channel.hfa"
#include <thread.hfa>
#include <time.hfa>
#include <stats.hfa>
size_t Processors = 1, Channels = 4, Producers = 1, Consumers = 1, ChannelSize = 128;

owner_lock o;

size_t total_operations = 0;
size_t cons_check = 0, prod_check = 0;

channel( size_t ) * channels;
thread Consumer {};
bool cons_done = false, prod_done = false;
volatile int cons_done_count = 0;

void getRandArray( int * chanIndices ) {
    for ( int i = 0; i < Channels; i++ ) {
        chanIndices[i] = i;
    }
    for ( int i = 0; i < Channels; i++ ) {
        int loc_1 = prng() % Channels;
        int loc_2 = prng() % Channels;
        int temp = chanIndices[ loc_1 ];
        chanIndices[ loc_1 ] = chanIndices[ loc_2 ];
        chanIndices[ loc_2 ] = temp;
    }
}

void main(Consumer & this) {
    size_t i = 0;
    size_t runs = 0;
    size_t my_check = 0;
    int chanIndices[Channels];
    getRandArray( chanIndices );
    
    for ( ;;i++ ) {
        if ( cons_done ) break;
        size_t j = remove( channels[ chanIndices[ i % Channels ] ] );
        my_check = my_check ^ j;
        if ( !prod_done ) runs++;
    }
    lock(o);
    total_operations += runs;
    cons_done_count++;
    cons_check = cons_check ^ my_check;
    // sout | "Cons: " | runs;
    unlock(o);
}

thread Producer {};

void main(Producer & this) {
    size_t i = 0;
    size_t runs = 0;
    size_t my_check = 0;
    int chanIndices[Channels];
    getRandArray( chanIndices );
    for ( ;;i++ ) {
        if ( prod_done ) break;
        insert( channels[ chanIndices[ i % Channels ] ], i );
        my_check = my_check ^ i;
        runs++;
    }
    lock(o);
    total_operations += runs;
    prod_check = prod_check ^ my_check;
    // sout | "Prods: " | runs;
    unlock(o);
}


int main( int argc, char *argv[] ) {
    switch( argc ) {
      case 4:
                if ( strcmp( argv[3], "d" ) != 0 ) {                    // default ?
                        if ( atoi( argv[3] ) < 1 ) goto Usage;
                        ChannelSize = atoi( argv[3] );
                } // if
      case 3:
                if ( strcmp( argv[2], "d" ) != 0 ) {                    // default ?
                        if ( atoi( argv[2] ) < 1 ) goto Usage;
                        Channels = atoi( argv[2] );
                } // if
      case 2:
                if ( strcmp( argv[1], "d" ) != 0 ) {                    // default ?
                        if ( atoi( argv[1] ) < 1 ) goto Usage;
                        Processors = atoi( argv[1] );
                } // if
          case 1:                                                                                       // use defaults
                break;
          default:
          Usage:
                sout | "Usage: " | argv[0]
             | " [ processors > 0 | d ]"
             | " [ producers > 0 | d ]"
             | " [ consumers > 0 | d ]"
             | " [ channels > 0 | d ]";
                exit( EXIT_FAILURE );
    }
    processor p[Processors - 1];
    channels = anew( Channels );
    Producers = Processors / 2;
    Consumers = Processors / 2;

    // sout | "Processors: " | Processors | " Producers: " | Producers | " Consumers: " | Consumers | "Channels: " | Channels | " Channel Size: " | ChannelSize;

    for ( i; Channels ) {
        channels[i]{ ChannelSize };
    }

    // sout | "start";
    {   
        Consumer c[Consumers];
        {
            Producer p[Producers];
            sleep(10`s);
            prod_done = true;
            // sout | "sleep";
        }
        // sout | "prods";
        cons_done = true;
        // for ( i; Channels ) {
        //     if ( get_count( channels[i] ) < Consumers ){
        //         for ( j; Consumers ) insert( channels[i], 0 );
        //     }
        // }
        while( cons_done_count != Consumers ) {
            for ( i; Channels ) {
                if ( has_waiters( channels[i] ) ){
                    insert( channels[i], 0 );
                }
            }
        }
    }
    // sout | "cons";

    for ( i; Channels ) {
        for ( ;; ) {
            if ( get_count( channels[i] ) > 0 ) {
                size_t j = remove( channels[ i ] );
                cons_check = cons_check ^ j;
            } else break;
        }
    }

    adelete( channels );

    if ( cons_check != prod_check )
        sout | "CHECKSUM MISMATCH !!!";
    // print_stats_now( *active_cluster(), CFA_STATS_READY_Q);

    // for ( i; Processors ) {
    //     delete(proc[i]);
    // }

    sout | total_operations;
    // print_stats_now( *active_cluster(), CFA_STATS_READY_Q );
    return 0;
}