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我正在调试一本书中的程序.该程序似乎工作,但我不明白我在下面评论的一行.

#include <pthread.h>
#include <stdio.h>
/* Compute successive prime numbers (very inefficiently). Return the
Nth prime number, where N is the value pointed to by *ARG. */
void* compute_prime (void* arg)
{
int candidate = 2;
int n = *((int*) arg);
while (1) {
int factor;
int is_prime = 1;
/* Test primality by successive division. */
for (factor = 2; factor < candidate; ++factor)
if (candidate % factor == 0) {
is_prime = 0;
break;
}
/* Is this …