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Fix eventfd read handling under heavy load.

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I had the assertion below fail occasionally when running the libzmq
tests under heavy CPU load on linux 3.16.0-4-amd64.
This commit is contained in:
Brian Silverman 2015-07-28 13:38:58 -07:00
parent 7b2e37dc90
commit 62a0e45089
1 changed files with 3 additions and 3 deletions
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6
src/signaler.cpp
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@ -291,10 +291,10 @@ void zmq::signaler_t::recv ()
ssize_t sz = read (r, &dummy, sizeof (dummy));
errno_assert (sz == sizeof (dummy));
// If we accidentally grabbed the next signal along with the current
// If we accidentally grabbed the next signal(s) along with the current
// one, return it back to the eventfd object.
if (unlikely (dummy == 2)) {
const uint64_t inc = 1;
if (unlikely (dummy > 1)) {
const uint64_t inc = dummy - 1;
ssize_t sz2 = write (w, &inc, sizeof (inc));
errno_assert (sz2 == sizeof (inc));
return;