Java 7 API文档中“并发”和“线程安全”的区别是什么？

Question

I just read through the API documentation of the java.util.concurrent package.

My impression is that " concurrent " and " thread-safe " are used synonymously there.

Example:

ConcurrentLinkedDeque - An unbounded concurrent deque based on linked nodes. ConcurrentLinkedQueue - An unbounded thread-safe queue based on linked nodes.

In the scope of the concurrency package can I assume that the wording thread-safe and concurrent mean the same thing?

Answer 1

Yes ... everything in the concurrent package can be used concurrently from different threads; eg thread-safe.

Specifically on the page you link to, under the "Concurrent Collections" section:

A concurrent collection is thread-safe, but not governed by a single exclusion lock.

Aside from that ... the entire purpose of the java.util.concurrent.* packages is to provide tools for concurrent (multi-threaded) programming.

See: Oracle's Java tutorials; Concurrency

Answer 2

我认为在这种情况下，它的意思是“一个线程安全的集合，它是非阻塞的（与其他使用同步的Stack等其他旧集合不同，它更适合于并发访问”）。

Answer 3

I've looked at the ConcurrentLinkedQueue documentation, and it says:

[...] As with other concurrent collections [...]

it also says:

[...] An unbounded thread-safe queue based on linked nodes.

Because it says that a CLQ is thread-safe, and it compares it to "other concurrent collections," I think we can assume that they are, in fact, used synonymously.

The only real way to find out is by inspecting the source of your Java distribution.