source: CIVL/examples/pthread/cprover/09_fmaxsym_true.c@ bb03188

#include <pthread.h>

#define assume(e) __VERIFIER_assume(e)
#define assert(e) { if(!(e)) { ERROR: goto ERROR; (void)0; } }

#define WORKPERTHREAD 2
#define THREADSMAX 3
volatile int max = 0x80000000, m = 0;

void __VERIFIER_atomic_acquire()
{
        assume(m==0);
        m = 1;
}

void __VERIFIER_atomic_release()
{
        assume(m==1);
        m = 0;
}

int storage[WORKPERTHREAD*THREADSMAX];

inline void findMax(int offset)
{
        int i;
        int e;

        for(i = offset; i < offset+WORKPERTHREAD; i++) {
                e = storage[i];
                
                __VERIFIER_atomic_acquire();
                {
                        if(e > max) {
                                max = e;
                        }
                }
                __VERIFIER_atomic_release();
                assert(e <= max);
        }
}

void* thr1(void* arg) {
        int offset;

        assume(offset % WORKPERTHREAD == 0 && offset >= 0 && offset < WORKPERTHREAD*THREADSMAX);
        //assume(offset < WORKPERTHREAD && offset >= 0 && offset < WORKPERTHREAD*THREADSMAX);

        findMax(offset);

  return 0;
}

int main(){
  pthread_t t;

        while(1) { pthread_create(&t, 0, thr1, 0); }
}