此篇文章讲述如何在PC机在eclipse环境下使用
armeb-adv-linux-gnu-gdb交叉调试arm上的多线程程序。
代码如下:
#include <pthread.h>
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#define MAX 10
pthread_t thread[2];
pthread_mutex_t mut;
int number=0, i;
void *thread1()
{
printf ("thread1 : I'm thread 1\n");
for (i = 0; i < MAX; i++)
{
printf("thread1 : number = %d\n",number);
pthread_mutex_lock(&mut);
number++;
pthread_mutex_unlock(&mut);
sleep(2);
}
pthread_exit(NULL);
}
void *thread2()
{
printf("thread2 : I'm thread 2\n");
for (i = 0; i < MAX; i++)
{
printf("thread2 : number = %d\n",number);
pthread_mutex_lock(&mut);
number++;
pthread_mutex_unlock(&mut);
sleep(3);
}
pthread_exit(NULL);
}
void thread_create(void)
{
int temp;
memset(&thread, 0, sizeof(thread)); //comment1
/*创建线程*/
if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0) //comment2
printf("create thread 1 failed\n");
else
printf("thread 1 created successfully\n");
if((temp = pthread_create(&thread[1], NULL, thread2, NULL)) != 0) //comment3
printf("create thread 2 failed\n");
else
printf("thread 2 created successfully\n");
}
void thread_wait(void)
{
/*等待线程结束*/
if(thread[0] !=0) { //comment4
pthread_join(thread[0],NULL);
printf("thread 1 ends\n");
}
if(thread[1] !=0) { //comment5
pthread_join(thread[1],NULL);
printf("thread 2 ends\n");
}
}
int main()
{
/*用默认属性初始化互斥锁*/
pthread_mutex_init(&mut,NULL);
printf("I am the main thread, I am creating threads\n");
thread_create();
printf("I am the main thread, I am waiting threads\n");
thread_wait();
return 0;
}
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注:以上代码摘自网络
makefile内容如下:
armeb-adv-linux-gnu-gcc.exe -g -o st main.c -lpthread --static
使用--static选项是为了防止调试时找不到库!
调试过程如下:
1.在main处设置断点并执行 continue
2.执行 set scheduler-locking on
含义:执行step或continue命令时,只有当前线程会执行
3.到thread_create执行完时,共创建了三个线程:
4.执行 "break main.c:13 thread 2",然后执行 "thread 2"可以切换到第2个线程执行(按thread之前的标号记)
5.执行 "next"命令单步调试第2个线程:
6.执行 "break main.c:28 thread 3",然后执行 "thread 3",切换到第3个线程执行:
完
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