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Every LEAP plugin gets its own LLLeapListener, managing its own collection of
listeners to various LLEventPumps. LLLeapListener's command LLEventPump now
has a UUID for a name, both for uniqueness and to make it tough for a plugin
to mess with any other.
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Have to pump "mainloop" a few times to flush the buffer to the pipe, a
potentially risky strategy: we have to trust that whatever condition led to
the LL_ERRS fatal error didn't break anything that listens on "mainloop". But
the worst that could happen is that the plugin won't be notified -- just as if
we didn't try in the first place. In other words, no harm in trying.
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While debugging mysterious problem on Windows, one potential failure mode to
rule out was the possibility that streaming std::ostringstream <<
LLSDNotationStreamer(large_LLSD) might itself cause trouble -- even before
attempting to write to the LLProcess::WritePipe. The debugging code validated
that the correct length is being reported, and that deserializing the
resulting buffer produces equivalent LLSD. This code verified correct
operation, and so has been disabled, as it's expensive at runtime.
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The code was using LLProcess::ReadPipe::get_istream().read(), but that's much
uglier, as it requires constructing a char* buffer etc. etc.
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Instantiating LLLeap with a command to execute a particular child process sets
up machinery to speak LLSD Event API Plugin protocol with that child process.
LLLeap is an LLInstanceTracker subclass, so the code that instantiates need
not hold the pointer. LLLeap monitors child-process termination and deletes
itself when done.
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