Daan De Meyer
37679d79a8
The synchronous qmp_client_call() pumps the event loop until its reply arrives, pinning the parsed reply on c->current so it can hand out borrowed pointers to the caller. That model only fits one in-flight sync call: a second qmp_client_call() on the same client clears c->current before issuing its own send, invalidating the first caller's borrowed pointers. On a single-threaded event loop that was fine, but with fibers two concurrent calls on the same client can interleave through the pump (json_stream_wait() suspends the running fiber) and trample each other. To fix this, make qmp_client_call() detect when it's running on a fiber whose event loop matches the client and transparently delegate to qmp_client_call_suspend(), which makes use of a new QmpFuture to allow multiple concurrent calls to qmp_client_call(). To make this work concurrently, we also change qmp_client_call() to hand out references and copies of errors so that we don't have to store the borrowed pointers we hand out in the QmpClient struct.
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