source: tests/concurrency/channels/churn.cfa @ 9fba8e6

#include <locks.hfa>
#include <fstream.hfa>
#include <stdio.h>
#include <string.h>
#include <channel.hfa>
#include <thread.hfa>
#include <time.hfa>

ssize_t Processors = 1, Channels = 4, Producers = 2, Consumers = 2, ChannelSize = 128;

owner_lock o;

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

channel( size_t ) * channels;
thread Consumer {};

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 );
    try {
        for ( ;;i++ ) {
            size_t j = remove( channels[ chanIndices[ i % Channels ] ] );
            my_check = my_check ^ j;
            runs++;
        }
    } catch ( channel_closed * e ) {}

    // flush out rest of channels
    for ( i; Channels ) {
        try {
            for ( ;; ) {
                size_t j = remove( channels[ i ] );
                my_check = my_check ^ j;
                runs++;
            }
        } catchResume ( channel_closed * e ) {} // continue to remove until would block
        catch ( channel_closed * e ) {} 
    }

    lock(o);
    total_operations += runs;
    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 );
    try {
        for ( ;;i++ ) {
            insert( channels[ chanIndices[ i % Channels ] ], i );
            my_check = my_check ^ i;
            runs++;
        }
    } catch ( channel_closed * e ) {} 
    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 ?
                        ChannelSize = ato( argv[3] );
                        if ( ChannelSize < 1 ) fallthru default;
                } // if
      case 3:
                if ( strcmp( argv[2], "d" ) != 0 ) {                    // default ?
                        Channels = ato( argv[2] );
                        if ( Channels < 1 ) fallthru default;
                } // if
      case 2:
                if ( strcmp( argv[1], "d" ) != 0 ) {                    // default ?
                        Processors = ato( argv[1] );
                        if ( Processors < 1 ) fallthru default;
                } // if
          case 1:                                                                                       // use defaults
                break;
          default:
                exit | "Usage: " | argv[0]
             | " [ processors > 0 | d ]"
             | " [ producers > 0 | d ]"
             | " [ consumers > 0 | d ]"
             | " [ channels > 0 | d ]";
    }
    processor p[Processors - 1];
    channels = aalloc( Channels );

    // 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);
            for ( i; Channels )
                close( channels[i] );
        }
    }

    adelete( channels );

    if ( cons_check != prod_check )
        sout | "CHECKSUM MISMATCH !!!";

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

    sout | "done";
    return 0;
}