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Resolve command starvation in recv()

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This commit is contained in:
Martin Hurton 2010-02-12 12:12:49 +01:00
parent 7f7ac843d5
commit cd7300fd4f
1 changed files with 19 additions and 19 deletions
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38
src/socket_base.cpp
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@ -327,8 +327,23 @@ int zmq::socket_base_t::flush ()
int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
{
// Get the message and return immediately if successfull.
// Get the message.
int rc = xrecv (msg_, flags_);
// Once every inbound_poll_rate messages check for signals and process
// incoming commands. This happens only if we are not polling altogether
// because there are messages available all the time. If poll occurs,
// ticks is set to zero and thus we avoid this code.
//
// Note that 'recv' uses different command throttling algorithm (the one
// described above) from the one used by 'send'. This is because counting
// ticks is more efficient than doing rdtsc all the time.
if (++ticks == inbound_poll_rate) {
app_thread->process_commands (false, false);
ticks = 0;
}
// If we have the message, return immediately.
if (rc == 0)
return 0;
@ -346,27 +361,12 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
}
else {
while (rc != 0) {
if (errno == EAGAIN)
app_thread->process_commands (true, false);
else
if (errno != EAGAIN)
return -1;
app_thread->process_commands (true, false);
rc = xrecv (msg_, flags_);
ticks = 0;
}
ticks = 0;
}
// Once every inbound_poll_rate messages check for signals and process
// incoming commands. This happens only if we are not polling altogether
// because there are messages available all the time. If poll occurs,
// ticks is set to zero and thus we avoid this code.
//
// Note that 'recv' uses different command throttling algorithm (the one
// described above) from the one used by 'send'. This is because counting
// ticks is more efficient than doing rdtsc all the time.
if (++ticks == inbound_poll_rate) {
app_thread->process_commands (false, false);
ticks = 0;
}
return rc;