source: src/tests/concurrent/preempt.c @ 90cedbdd

#include <kernel>
#include <thread>
#include <time>

#ifndef PREEMPTION_RATE
#define PREEMPTION_RATE 10`ms
#endif

Duration default_preemption() {
        return PREEMPTION_RATE;
}

#ifdef LONG_TEST
static const unsigned long N = 30_000ul;
#else
static const unsigned long N = 500ul;
#endif

extern void __cfaabi_check_preemption();

static volatile int counter = 0;

thread worker_t {
        int value;
};

void ?{}( worker_t & this, int value ) {
        this.value = value;
}

void main(worker_t & this) {
        while(counter < N) {
                __cfaabi_check_preemption();
                if( (counter % 7) == this.value ) {
                        __cfaabi_check_preemption();
                        int next = __atomic_add_fetch_4(&counter, 1, __ATOMIC_SEQ_CST);
                        __cfaabi_check_preemption();
                        if( (next % 100) == 0 ) printf("%d\n", (int)next);
                        __cfaabi_check_preemption();
                }
                __cfaabi_check_preemption();
        }
}

int main(int argc, char* argv[]) {
        processor p;
        {
                worker_t w0 = 0;
                worker_t w1 = 1;
                worker_t w2 = 2;
                worker_t w3 = 3;
                worker_t w4 = 4;
                worker_t w5 = 5;
                worker_t w6 = 6;
        }
}