[kaffe] patch for unix-jthreads: thread dump on demand

[jrandom]

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One of these days I'll remember the changelog...

2004-08-30	jrandom <jrandom at i2p.net>

	* kaffe/kaffevm/systems/unix-jthreads/jthread.c:
	(handleInterrupt): Dump the threads on SIGUSR2.
	(dumpJavaThreadLocal): Added.
	(dumpThreadsLocal): Added.
	(handleIO): Avoid a hang by limiting the maximum wait.

	* kaffe/kaffevm/systems/unix-jthreads/signal.c:
	(registerAsyncSignalHandler): accept SIGUSR2

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