GDB 的几个用法(until, finish, tui)

1. until

这个用于执行完循环。

在执行完循环体内的最后一条语句之后执行 until, 就会执行完循环体到后面的一个语句停下。

2. finish

执行完当前的函数。

3. tui

是一个命令行的界面，能同时把代码显示出来。

inf

4. 设置条件断点的方法：

4.1 break [location]  if condition

(gdb) l
2	{
3		int i;
4		int k = 0;
5		for(i = 0; i < 10; i++)
6		{
7			k = i * i;
8		}
9	
10		return 0;
11	}
(gdb) break 7 if i == 5
Breakpoint 4 at 0x80483ca: file testloop.c, line 7.
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y

Starting program: /home/charles/code/testloop 

Breakpoint 4, main () at testloop.c:7
7			k = i * i;
(gdb) p i
$7 = 5
(gdb) 

4.2 使用 condition  N condition.  N是一个 breakpoint number.

(gdb) l
1	int main(void)
2	{
3		int i;
4		int k = 0;
5		for(i = 0; i < 10; i++)
6		{
7			k = i * i;
8		}
9	
10		return 0;
(gdb) break 7
Breakpoint 1 at 0x80483ca: file testloop.c, line 7.
(gdb) info breakpoints 
Num     Type           Disp Enb Address    What
1       breakpoint     keep y   0x080483ca in main at testloop.c:7
(gdb) help condition 
Specify breakpoint number N to break only if COND is true.
Usage is `condition N COND', where N is an integer and COND is an
expression to be evaluated whenever breakpoint N is reached.
(gdb) condition  1 i == 4
(gdb) info breakpoints 
Num     Type           Disp Enb Address    What
1       breakpoint     keep y   0x080483ca in main at testloop.c:7
	stop only if i == 4
(gdb) r
Starting program: /home/charles/code/testloop 

Breakpoint 1, main () at testloop.c:7
7			k = i * i;
(gdb) p i
$1 = 4

5. 多线程下禁止线程切换：

set scheduler-locking on