我正在尝试在 Linux（Ubuntu）机器上编译以下程序：
#include <pthread.h>
#include <stdio.h>
int sum; /* this data is shared by the thread(s) */
void *runner(void *param); /* threads call this function */
int main(int argc, char *argv[])
{
pthread t tid; /* the thread identifier */
pthread attr t attr; /* set of thread attributes */
if (argc != 2) {
fprintf(stderr,"usage: a.out <integer value>\n");
return -1;
}
if (atoi(argv[1]) < 0) {
fprintf(stderr,"%d must be >= 0\n",atoi(argv[1]));
return -1;
}
/* get the default attributes */
pthread attr init(&attr);
/* create the thread */
pthread create(&tid,&attr,runner,argv[1]);
/* wait for the thread to exit */
pthread join(tid,NULL);
printf("sum = %d\n",sum);
}
/* The thread will begin control in this function */
void *runner(void *param)
{
int i, upper = atoi(param);
sum = 0;
for (i = 1; i <= upper; i++)
sum += i;
pthread exit(0);
}
但是，每当我尝试这样做时： gcc -o runner runner.c 我收到一个错误“未知类型名称'pthread'。现在我一直在环顾四周，发现我必须包含 -lpthread： gcc -o runner runner.c -lpthread 但是它会产生同样的错误。
我运行了以下命令：whereis pthread并返回文件位置，所以我知道我有文件。