多线程编程之：Linux线程编程
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接下来可以在线程运行前后使用“free”命令查看内存的使用情况。以下是运行结果：
$ ./thread_attr
Create tread success
Waiting for thread to finish...
Thread is starting
Waiting for thread to finish...
Thread : job 0 delay = 3
Waiting for thread to finish...
Thread : job 1 delay = 2
Waiting for thread to finish...
Waiting for thread to finish...
Waiting for thread to finish...
Waiting for thread to finish...
Thread : job 2 delay = 9
Thread finished
/* 程序运行之前 */
$ free
total used free shared buffers cached
Mem: 255556 191940 63616 10 5864 61360
-/+ buffers/cache: 124716 130840
Swap: 377488 18352 359136
/* 程序运行之中 */
$ free
total used free shared buffers cached
Mem: 255556 191948 63608 10 5888 61336
-/+ buffers/cache: 124724 130832
Swap: 377488 18352 359136
/* 程序运行之后 */
$ free
total used free shared buffers cached
Mem: 255556 191940 63616 10 5904 61320
-/+ buffers/cache: 124716 130840
Swap: 377488 18352 359136
可以看到，线程在运行结束后就收回了系统资源，并释放内存。
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