source: tests/concurrency/unified_locking/mcs.cfa @ 26dfce5

#include <fstream.hfa>
#include <locks.hfa>
#include <thread.hfa>

const unsigned int num_times = 50000;

struct MutexObj {
        mcs_lock l;
        thread$ * id;
        size_t sum;
};

MutexObj mo;

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

unsigned cs() {
        thread$ * me = active_thread();
        unsigned value = (unsigned)me;
        mcs_node n;
        lock(mo.l, n);
        {
                size_t tsum = mo.sum;
                mo.id = me;
                yield(random(5));
                if(mo.id != me) sout | "Intruder!";
                mo.sum = tsum + value;
        }
        unlock(mo.l, n);
        return value;
}

thread LockCheck {
        size_t sum;
};

void main(LockCheck & this) {
        this.sum = 0;
        for(num_times) {
                trash();
                this.sum += cs();
                trash();
                yield(random(10));
        }
}

int main() {
        size_t sum = -32;
        mo.sum = -32;
        processor p[2];
        sout | "Starting";
        {
                LockCheck checkers[13];
                for(i;13) {
                        sum += join(checkers[i]).sum;
                }
        }
        sout | "Done!";
        if(sum == mo.sum) sout | "Match!";
        else sout | "No Match!" | sum | "vs" | mo.sum;
}