Question

我坐在Beaglebone Black上并遇到pthread_join问题，这给了我Bus错误。请参阅以下代码。这是直接从pthreads上的Youtube教程中获取的。

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void *myfunc (void *myvar);

int main(int argc, char* argv[])
{
    pthread_t thread1, thread2;
    char *msg1 = "First thread";
    char *msg2 = "Second thread";
    int ret1, ret2;

    ret1 = pthread_create(&thread1, NULL, myfunc, (void *) msg1);
    ret2 = pthread_create(&thread1, NULL, myfunc, (void *) msg2);

    printf("Main function after pthread_create\n");

    pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);

    // Bus error on the above pthread_join
    printf("Here is OK\n"); 
    printf("First thread ret1 = %d\n", ret1);
    printf("Second thread ret2 = %d\n", ret2);

   return 0;
}

void *myfunc (void *myvar)
{
   char *msg;
   msg = (char *) myvar;

   int i;
   for(i=0; i < 10; i++)
   {
       printf("%s %d\n", msg, i);
       sleep(1);
   }

 return NULL;

}

这段代码在我运行Ubuntu 14.04的电脑上完美运行，尽管Valgrind显示了一些可能丢失的＃34; pthread_join命令中的字节数。因此代码不是问题 - 我认为它必须是在Beaglebone上运行的Debian上引发它的东西。是的，我确实包含了-lpthread库。

我在Beaglebone上获得的输出是：

Main function after pthread_create
Second thread 0
First thread 0
Second thread 1
First thread 1
Second thread 2
First thread 2
Second thread 3
First thread 3
Second thread 4
First thread 4
Second thread 5
First thread 5
Second thread 6
First thread 6
Second thread 7
First thread 7
Second thread 8
First thread 8
Second thread 9
First thread 9
Bus error

在Beaglebone上运行的Debian版本：

Distributor ID: Debian
Description:    Debian GNU/Linux 7.8 (wheezy)
Release:        7.8
Codename:       wheezy

编辑：打印以下调试信息：

Program received signal SIGBUS, Bus error.
0xb6fbdbd0 in pthread_join () from /lib/arm-linux-gnueabih/libpthread.so.0

提前感谢所有提示。

Answer 1

这里有一个错误（错误？错误原件？）：

ret1 = pthread_create(&thread1, NULL, myfunc, (void *) msg1);
ret2 = pthread_create(&thread1, NULL, myfunc, (void *) msg2);

您将两个主题ID都存储在thread1中，而thread2保持未初始化状态。第二次调用pthread_create()应使用&thread2。

Debian pthread_join总线错误

1 个答案: