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.