windows 我是否必须 JNI 分离附加线程？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1945813/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Do I Have to JNI Detach an Attached Thread?
提问by Ronald Blaschke
I have some native thread that needs to call into Java. For that, I need to attach the thread to the VM using AttachCurrentThread. Since this callback will happen quite often, the thread should probably stay attached. Calling AttachCurrentThreadmultiple times is fine ("Trying to attach a thread that is already attached is a no-op.")
我有一些需要调用 Java 的本机线程。为此，我需要使用AttachCurrentThread. 由于这个回调会经常发生，线程应该保持连接。AttachCurrentThread多次调用是可以的（“尝试附加一个已经附加的线程是一个空操作。”）
Do I have to call DetachCurrentThreadbefore the thread exits, will it happen automatically, or is it not even required? What happens if I must call detach, but don't? Would it just "leak," or could this even corrupt the VM state?
我是否必须DetachCurrentThread在线程退出之前调用，它会自动发生，还是甚至不需要？如果我必须调用 detach 但不调用会发生什么？它会不会只是“泄漏”，或者这甚至会破坏 VM 状态？
I have checked the Java Native Interface specification, but either missed this, or it really is unspecified.
我已经检查了 Java Native Interface 规范，但要么错过了这一点，要么确实未指定。
My question applies specifically to Sun JDK 6 on Windows XP.
我的问题特别适用于 Windows XP 上的 Sun JDK 6。
回答by kdgregory
I think that the confirmation that you want is here: http://java.sun.com/javase/6/docs/technotes/guides/jni/spec/invocation.html#wp1060
我认为您想要的确认在这里：http: //java.sun.com/javase/6/docs/technotes/guides/jni/spec/invocation.html#wp1060
A native thread attached to the VM must call DetachCurrentThread() to detach itself before exiting.
附加到 VM 的本机线程在退出之前必须调用 DetachCurrentThread() 以分离自身。
And in the next section, there's the rationale:
在下一节中，有一个基本原理：
The VM waits until the current thread is the only non-daemon user thread before it actually unloads. User threads include both Java threads and attached native threads.
在实际卸载之前，VM 会一直等到当前线程是唯一的非守护程序用户线程。用户线程包括 Java 线程和附加的本机线程。
