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系统编程为全世界的计算提供了基础。开发性能敏感代码需要一种编程语言，能够让程序员掌控内存、处理器时间以及其他系统资源。Rust系统编程语言将这种控制力与现代类型系统相结合，可以捕捉到从内存管理错误到线程间数据竞争等各种常见的错误。通过这本实用指南，有经验的系统程序员将学会如何成功地使用Rust弥补性能和安全之间的差距。Jim Blandy、Jason Orendorff和Leonora Tindall展示了Rust的特性如何通过将可预测的性能与内存安全和可信赖的并发性结合起来，使程序员得以控制内存消耗和处理器的使用。

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You've heard that Rust lets you write safe, fase, concurrent programs. This is the chapter where we show you how it's done. We'll cover three ways to use Rust threads:

1. Fork-join parallelism

2. Channels

3. Shared muatble state

A panic is not a crash. It’s not undefined behavior. It’s more like a RuntimeException in Java or a std::logic_error in C++. The behavior is well-defined; it just shouldn’t be happening.

Panic is safe. It doesn’t violate any of Rust’s safety rules; even if you manage to panic in the middle of a standard library method, it will never leave a dangling pointer or a half-initialized value in memory. The idea is that Rust catches the invalid array access, or whatever it is, before anything bad happens. It would be unsafe to proceed, so Rust unwinds the stack. But the rest of the process can continue running.

Panic is per thread. One thread can be panicking while other threads are going on about their normal business. In Chapter19, we’ll show how a parent thread can find out when a child threa...

Stack unwinding is the default panic behavior, but there are two circumstances in which Rust does not try to unwind the stack.

If a .drop() method triggers a second panic while Rust is still trying to clean up after the first, this is considered fatal. Rust stops unwinding and aborts the whole process.

Also, Rust’s panic behavior is customizable. If you compile with -C panic=abort, the first panic in your program immediately aborts the process. (With this option, Rust does not need to know how to unwind the stack, so this can reduce the size of your compiled code.)

以上情况的共同点是他们都由（不客气地说）程序员的错误所导致。而行之有效的的一条经验法则是：“不要 panic”。

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系统编程为全世界的计算提供了基础。开发性能敏感代码需要一种编程语言，能够让程序员掌控内存、处理器时间以及其他系统资源。Rust系统编程语言将这种控制力与现代类型系统相结合，可以捕捉到从内存管理错误到线程间数据竞争等各种常见的错误。通过这本实用指南，有经验的系统程序员将学会如何成功地使用Rust弥补性能和安全之间的差距。Jim Blandy、Jason Orendorff和Leonora Tindall展示了Rust的特性如何通过将可预测的性能与内存安全和可信赖的并发性结合起来，使程序员得以控制内存消耗和处理器的使用。