Is the source code of native methods available?

Question

At first I want to let you know that this question is not related with What is native implementation in Java. I got many useful information from that thread.

I want to know that are the codes of the native implementations available? I have jdk source code but I can not find the native codes for System.currentTimeMillis or Runtime.getRuntime().availableProcessors() or other native method.

You can download the source for the entire OpenJDK and have it open as another project if you have the memory (At least I do. ;) — Peter Lawrey, Jun 28 '11 at 09:20
@Peter Lawrey are you referring http://download.java.net/openjdk/jdk6/ ? — Tapas Bose, Jun 28 '11 at 09:26
Yes the bundle is 4 months old and you can also download the latest from source control but its unlikely to matter. — Peter Lawrey, Jun 28 '11 at 09:38

score 11 · Accepted Answer · edited Jun 04 '15 at 07:01

11

Yes, see os::javaTimeMillis in /src/os/solaris/vm/os_solaris.cpp to see the Solaris implementation for instance.

There are a few layers of wrappers to get there though, see JVM_CurrentTimeMillis in /src/share/vm/prims/jvm.cpp

edited Jun 04 '15 at 07:01

Ciro Santilli Путлер Капут 六四事

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answered Jun 28 '11 at 06:13

Henrik Gustafsson

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score 2 · Answer 2 · answered Dec 30 '14 at 15:27

Because the underlying methods are intrinsic to the OS you are running Java on, you will not find their source code in the JDK documentation. I suppose you'd need to find out exactly which procedures are called on your platform, and if source code is available for those (which strongly depends on your OS).

Is the source code of native methods available?

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