关于使用gdb的一些建议

参考：《Linux® Debugging and Performance Tuning: Tips and Techniques》 chapter 3

1. 测试程序

/home/a/j/nomad2:cat gdb_sample2.c
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
void* Thread_function1(void * arg)
{
unsigned int i=1;
while(i < 11)
{
printf("Child Thread Iteration %d\n",i);
i++;
if(i%2)
sleep(2);
else
sleep(1);
}
return arg;
}
void* Thread_function2(void * arg)
{
unsigned int i=1;
while(i < 11)
{
printf("Child Thread 2 Iteration %d\n",i);
i++;
if(i%2)
sleep(2);
else
sleep(1);
}
return arg;
}
int main (int argc, char *argv[])
{
pthread_t thread;
pthread_t thread2;
if(pthread_create(&thread,NULL,Thread_function1,NULL))
{
return(1);
}
if(pthread_create(&thread2,NULL,Thread_function2,NULL))
{
return(1);
}
unsigned int i = 1;
while(i < 11)
{
printf("Main Loop Iteration %d\n",i);
i++;
if(i%2)
sleep(1);
else
sleep(2);
}
return 0;
}

2. build with debug info increase the executable size.

/home/a/j/nomad2:ls -lrt a.out

-rwxr-xr-x 1 nomad2 member 11341 Oct 1 19:34 a.out

/home/a/j/nomad2:strip --strip-debug a.out

/home/a/j/nomad2:ls -lrt a.out

-rwxr-xr-x 1 nomad2 member 7522 Oct 1 19:42 a.out

3. 关于调试：

1). When debugging, it is often a good practice to stop program execution at the bottom of a function so that a print or multiple displays can be done to see the current values stored in the data the function has altered.

list <func name>

break <line of }>

2). When gdb is used, the print command must

be invoked to display the variable's value. The user can see much more information at one time.