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Fix eventfd read handling under heavy load.
I had the assertion below fail occasionally when running the libzmq tests under heavy CPU load on linux 3.16.0-4-amd64.
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@ -291,10 +291,10 @@ void zmq::signaler_t::recv ()
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ssize_t sz = read (r, &dummy, sizeof (dummy));
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errno_assert (sz == sizeof (dummy));
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// If we accidentally grabbed the next signal along with the current
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// If we accidentally grabbed the next signal(s) along with the current
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// one, return it back to the eventfd object.
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if (unlikely (dummy == 2)) {
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const uint64_t inc = 1;
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if (unlikely (dummy > 1)) {
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const uint64_t inc = dummy - 1;
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ssize_t sz2 = write (w, &inc, sizeof (inc));
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errno_assert (sz2 == sizeof (inc));
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return;
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