Apple

Hello, i've been trying to timestamp when context switches occur in the kernel using this dtrace script: http://lists.apple.com/archives/perfoptimization-dev/2007/Dec/msg00011.html. dtrace is used to gather the context switch information and probes in the Java program is used to gather the rest of the information.

The problem i'm having is that the thread id returned by curthread in the dtrace script is different from the result returned by the pthread_self() call that I make in a JNI method. The documentation says that curthread and tid are the same as that returned pthread_self() however I suspect that is a holdover from the solaris docs.

Where does curthread come from and is there a way to get it using a method in userspace? is there a different way to relate the data? should I just try Solaris?

I'm aware that this will probably be non-portable and likely to break if the kernel is changed.

Paul Johnson

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