EPoll C Implementation that I can call from Java through JNI

Question

Has any C guru ever implemented a Epoll Non-blocking selector in C that I can call from Java so I don't have to use Java's NIO Epoll implementation?

what's wrong with the one in NIO? If you describe your problem maybe this community can help you work around it better. — Some programmer dude, Aug 29 '12 at 05:13
@JoachimPileborg I am hoping that a native C implementation can be fine-tuned for better latency than the one implemented by Sun. — JohnPristine, Aug 29 '12 at 05:15

score 0 · Accepted Answer · edited May 23 '17 at 11:49

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You can find epoll sample program written in C by me. I hope that will help you Could you recommend some guides about Epoll on Linux

edited May 23 '17 at 11:49

Community

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answered Aug 29 '12 at 06:53

Viswesn

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Thanks, but I would not be able to take this code and code something with Java + JNI. I guess I will make peace with the standard Java NIO implementations. :) – JohnPristine Aug 29 '12 at 14:03

score 0 · Answer 2 · answered Oct 19 '12 at 07:42

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SelectorProvider in Java 6 uses epoll if it's run on Linux with kernel 2.6 or higher.

answered Oct 19 '12 at 07:42

expert

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score 0 · Answer 3 · edited Aug 02 '13 at 05:27

yes, java support epoll in JVM source code, you can find the follow code

JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollCreate(JNIEnv *env, jclass c) {
/*  
 * epoll_create expects a size as a hint to the kernel about how to
 * dimension internal structures. We can't predict the size in advance.
 */
int epfd = epoll_create(256);
if (epfd < 0) {
   JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
}   
return epfd;
}

EPoll C Implementation that I can call from Java through JNI

3 Answers3