I haven't taken a deep look at this code, but I have one suggestion based on the performance profiling of Jikes RVM and classpath 0.09 I was doing the end of last week.
Would it be possible to change the native methods to take the file descriptor as an additional argument? In the current Java/native breakdown the very first thing most native methods do is callback via JNI to acquire the fd. This is much less efficient (at least on Jikes RVM, and I suspect on most JNI-based VMs) then loading the fd in the Java code and then passing it as an argument to the native methods that need it. You might need to add a wrapper method in some cases if the native method is called by other classes, for example:
public native int read();
becomes
public int read() {
return readImpl(fd);
}
private native int readImpl(int fd);
--dave
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