包括调用所有链接到的动态链接库(DLL)的入口点函数，给出一个值，指出这个进程正在解除那个DLL的链接。
This includes calling the entry-point function of all attached dynamic-link libraries (DLLs) with a value indicating that the process is detaching from the DLL.
您必须以root身份来进行chroot调用，而且您应该快速地改变为非root身份(root用户可以脱离chroot环境，所以如果它要生效，您需要解除那个特权)。
You must be root to make the chroot call, and you should quickly change to non-root (a root user can escape a chroot environment, so if it's to be effective, you need to drop that privilege).
如果独占访问的资源已经被锁定，则此方法阻塞那个调用线程，直到那个资源被解除锁定。
If the exclusive access to the resource is already locked, this method blocks the calling thread until it is unlocked.
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