rust/src/test/run-pass/task-comm-3.rs

io fn main() -> () {
   log "===== THREADS =====";
   test00(false);
}

io fn test00_start(chan[int] ch, int message, int count) {
    log "Starting test00_start";
    let int i = 0;
    while (i < count) {
        log "Sending Message";
        ch <| message;
        i = i + 1;
    }
    log "Ending test00_start";
}

io fn test00(bool is_multithreaded) {
    let int number_of_tasks = 1;
    let int number_of_messages = 0;
    log "Creating tasks";
    
    let port[int] po = port();
    let chan[int] ch = chan(po);
    
    let int i = 0;
    
    // Create and spawn tasks...
    let vec[task] tasks = vec();
    while (i < number_of_tasks) {
        i = i + 1;
        if (is_multithreaded) {
            tasks += vec(
                spawn thread test00_start(ch, i, number_of_messages));
        } else {
            tasks += vec(spawn test00_start(ch, i, number_of_messages));
        }
    }
    
    // Read from spawned tasks...
    let int sum = 0;
    for (task t in tasks) {
        i = 0;
        while (i < number_of_messages) {
            let int value <- po;
            sum += value;
            i = i + 1;
        }
    }

    // Join spawned tasks...
    for (task t in tasks) {
        join t;
    }
    
    log "Completed: Final number is: ";
    check (sum + 1 == number_of_messages * 
           (number_of_tasks * number_of_tasks + number_of_tasks) / 2);
    log sum;
}