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Merge pull request #1409 from rikvdh/master

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Fix another degradation, CPU maxes out when POLLOUT is set
This commit is contained in:
Constantin Rack 2015-05-27 14:50:24 +02:00
commit a146503d30
1 changed files with 14 additions and 4 deletions
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18
src/proxy.cpp
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@ -108,11 +108,15 @@ int zmq::proxy (
int more;
size_t moresz;
zmq_pollitem_t items [] = {
{ frontend_, 0, ZMQ_POLLIN | ZMQ_POLLOUT, 0 },
{ backend_, 0, ZMQ_POLLIN | ZMQ_POLLOUT, 0 },
{ frontend_, 0, ZMQ_POLLIN, 0 },
{ backend_, 0, ZMQ_POLLIN, 0 },
{ control_, 0, ZMQ_POLLIN, 0 }
};
int qt_poll_items = (control_ ? 3 : 2);
zmq_pollitem_t itemsout [] = {
{ frontend_, 0, ZMQ_POLLOUT, 0 },
{ backend_, 0, ZMQ_POLLOUT, 0 }
};
// Proxy can be in these three states
enum {
@ -127,6 +131,12 @@ int zmq::proxy (
if (unlikely (rc < 0))
return -1;
// Get the pollout separately because when combining this with pollin it maxes the CPU
// because pollout shall most of the time return directly
rc = zmq_poll (&itemsout [0], 2, 0);
if (unlikely (rc < 0))
return -1;
// Process a control command if any
if (control_ && items [2].revents & ZMQ_POLLIN) {
rc = control_->recv (&msg, 0);
@ -160,7 +170,7 @@ int zmq::proxy (
// Process a request
if (state == active
&& items [0].revents & ZMQ_POLLIN
&& items [1].revents & ZMQ_POLLOUT) {
&& itemsout [1].revents & ZMQ_POLLOUT) {
rc = forward(frontend_, backend_, capture_,msg);
if (unlikely (rc < 0))
return -1;
@ -168,7 +178,7 @@ int zmq::proxy (
// Process a reply
if (state == active
&& items [1].revents & ZMQ_POLLIN
&& items [0].revents & ZMQ_POLLOUT) {
&& itemsout [0].revents & ZMQ_POLLOUT) {
rc = forward(backend_, frontend_, capture_,msg);
if (unlikely (rc < 0))
return -1;