source: tests/concurrency/once.cfa

#include <barrier.hfa>
#include <fstream.hfa>
#include <kernel.hfa>
#include <once.hfa>
#include <thread.hfa>

once_flag global;

volatile int check;

void reset() {
        (global){};
        check = 0;
}

void must_once(void) {
        int prev = __atomic_fetch_add( &check, 1, __ATOMIC_SEQ_CST );
        if(prev != 0) {
                abort | "'must_once' appears to have been called more than once, check was" | prev;
        }
}

barrier barr = { 11 };

thread Tester {};

void main( Tester & this ) {
        for(500) {
                block( barr, reset );

                // sometime yields
                yield( prng(this, 3) );
        }
}

int main() {
        processor p[2];

        sout | "starting";
        {
                Tester testers[11];
        }
        sout | "done";
}