linux下使用gdb调试崩溃和死锁实例

Posted 2022-06-09 shixin_0125

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gdb是linux下一款功能强大的调试工具，windows下对应的有windbg，下面举例说明常见程序错误解决方法

1.gdb启动

要想使用gdb调试，编译时指定-g选项加入调试信息，gdb可以启动执行文件，attach正在运行程序，调试程序崩溃产生core文件

启动gdb后输入run运行，continue继续，quiet退出，下面是调试一段崩溃和死锁的源码

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

pthread_mutex_t mutex; 

int count = 0;
void print_pid_tid() 
 
  pid_t   pid; 
  pthread_t   tid; 

  pid = getpid(); 
  tid = pthread_self(); 

  printf("pid %u tid %u (0x%x)\\n", (unsigned int)pid, 
    (unsigned int)tid, (unsigned int)tid); 
 


void callback_func()

  pthread_mutex_lock(&mutex); 
  printf("count:%d\\n",count);


void *thread_func1(void *arg) 
 
  while (1)
  
    int n = *((int *)arg);
    pthread_mutex_lock(&mutex); 
    print_pid_tid(); 
    count += 2;
    for (int i=0 ; i < 5; ++i ) 
    
      count += n;
     
    callback_func();
    pthread_mutex_unlock(&mutex); 
    sleep(1);
  
  return 0;
 
void *thread_func2(void *arg)

  while (1)
  
    pthread_mutex_lock(&mutex); 
    printf("thread_func2 run\\n");
    pthread_mutex_unlock(&mutex); 
    sleep(1);
  
  return 0;

void *thread_func3(void *arg)

  while(1)
  
    char *str = NULL;
    //strcpy(str,"hello world");
    sleep(1);
  

  return 0;


int main(void) 
 
  pthread_t ntid; 
  int count = 10; 

  pthread_mutex_init(&mutex, NULL); 

  int err = pthread_create(&ntid, NULL, thread_func1, &count); 
  if ( 0 != err ) 
   
    printf("pthread_create1:%s\\n", strerror(err)); 
   
  err = pthread_create(&ntid, NULL, thread_func2, &count); 
  if ( 0 != err ) 
   
    printf("pthread_create2:%s\\n", strerror(err)); 
  
  err = pthread_create(&ntid, NULL, thread_func3, &count); 
  if ( 0 != err ) 
   
    printf("pthread_create3:%s\\n", strerror(err)); 
  
  getchar();

  int **ret = NULL; 
  pthread_join(ntid, (void**)ret); 
  printf("pthread_join:%p\\n", *ret); 

  pthread_mutex_destroy(&mutex); 


  return 0;