This provides the system call interface that connects to the kernel and provides the mechanism to transition between the user-space application and the kernel.
它提供了连接内核的系统调用接口，还提供了在用户空间应用程序和内核之间进行转换的机制。
2
The threading model in Linux has changed with the release of glibc 2.3 and the transition of the Linux kernel from version 2.4 to version 2.6.
随着 glibc 2.3 的发布和 Linux 内核从版本 2.4 到版本 2.6 的变迁，线程模型已经发生了变化。