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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.

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    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. ;) Commented Jun 28, 2011 at 9:20
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    @Peter Lawrey are you referring download.java.net/openjdk/jdk6 ? Commented Jun 28, 2011 at 9:26
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    Yes the bundle is 4 months old and you can also download the latest from source control but its unlikely to matter. Commented Jun 28, 2011 at 9:38

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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

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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).

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