source: tests/collections/atomic_mpsc.cfa @ 4ff7ea3

#include <fstream.hfa>
#include <collections/lockfree.hfa>
#include <thread.hfa>

const unsigned int num_times = 50000;

struct some_node {
        some_node * volatile next;
        single_sem sem;
        unsigned value;
};

void ?{}(some_node & this) { this.next = 0p; }

static inline some_node * volatile & ?`next ( some_node * node ) {
        return node->next;
}

mpsc_queue(some_node) global_queue;

void thrash() {
        unsigned t[100];
        for(i; 100) {
                t[i] = 0xDEADBEEF;
        }
}

thread Producer {
        size_t sum;
};
void ?{}( Producer & this ) { this.sum = 0; }

void wait(Producer & this) {
        some_node node;
        node.value = (unsigned)&this;
        push(global_queue, &node);
        wait(node.sem);
        this.sum += node.value;
}

void main(Producer & this) {
        for(num_times) {
                thrash();
                wait(this);
                thrash();
                yield(random(10));
        }
}

thread Consumer {
        size_t sum;
};
void ?{}(Consumer & this) { this.sum = 0; }
void main(Consumer & this) {
        LOOP: for() {
                waitfor( ^?{} : this) {
                        break LOOP;
                }
                or else {}

                some_node * node = pop(global_queue);
                if(node) {
                        this.sum += node->value;
                        post(node->sem);
                }
                else yield();
        }
}

int main() {
        unsigned psum = 0;
        unsigned csum = -32;
        processor p[2];
        sout | "Starting";
        {
                Consumer cons;
                {
                        Producer prods[13];
                        for(i; 13) {
                                psum += join(prods[i]).sum;
                        }
                }
                csum = join(cons).sum;
        }
        sout | "Done!";
        if(psum == csum) sout | "Match!";
        else sout | "No Match!";
}