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Background threads enhancements (#2778)

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* Background thread scheduling 

- add ZMQ_THREAD_AFFINITY ctx option; set all thread scheduling options
from the context of the secondary thread instead of using the main
process thread context!
- change ZMQ_THREAD_PRIORITY to support setting NICE of the background
thread when using SCHED_OTHER
This commit is contained in:
f18m
2017-10-16 13:29:03 +02:00
committed by Luca Boccassi
parent 577e713e2c
commit bfbb4ff2e9
10 changed files with 226 additions and 18 deletions
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10
src/ctx.cpp
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@@ -76,7 +76,8 @@ zmq::ctx_t::ctx_t () :
blocky (true),
ipv6 (false),
thread_priority (ZMQ_THREAD_PRIORITY_DFLT),
thread_sched_policy (ZMQ_THREAD_SCHED_POLICY_DFLT)
thread_sched_policy (ZMQ_THREAD_SCHED_POLICY_DFLT),
thread_affinity (ZMQ_THREAD_AFFINITY_DFLT)
{
#ifdef HAVE_FORK
pid = getpid();
@@ -250,6 +251,11 @@ int zmq::ctx_t::set (int option_, int optval_)
thread_sched_policy = optval_;
}
else
if (option_ == ZMQ_THREAD_AFFINITY && optval_ >= 0) {
scoped_lock_t locker(opt_sync);
thread_affinity = optval_;
}
else
if (option_ == ZMQ_BLOCKY && optval_ >= 0) {
scoped_lock_t locker(opt_sync);
blocky = (optval_ != 0);
@@ -395,8 +401,8 @@ zmq::object_t *zmq::ctx_t::get_reaper ()
void zmq::ctx_t::start_thread (thread_t &thread_, thread_fn *tfn_, void *arg_) const
{
thread_.setSchedulingParameters(thread_priority, thread_sched_policy, thread_affinity);
thread_.start(tfn_, arg_);
thread_.setSchedulingParameters(thread_priority, thread_sched_policy);
#ifndef ZMQ_HAVE_ANDROID
thread_.setThreadName ("ZMQ background");
#endif