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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void * f(void * x) {
long y = (long)x;
return (void *)(y * y);
}
#define nthreads 100
int main() {
pthread_t th[nthreads];
long i;
for (i = 0; i < nthreads; i++) {
int r = pthread_create(&th[i], 0, f, (void *)i);
assert(r == 0);
}
for (i = 0; i < nthreads; i++) {
void * ret[1];
pthread_join(th[i], ret);
if (ret[0] != (void *)(i * i)) {
printf("NG\n");
return 1;
}
}
printf("OK\n");
return 0;
}
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