Comments (4)
@yerden The sending will happen on an other thread. So you are just queuing the message. With zmq_send
you can quckly assemble a message (even on the stack) and put it to the queue and then move on, releasing that message on your thread. The sending thread will release the copy of that message when it not needed anymore. In case of zmq_send_const
you have to keep in memory the original message until the sending moment. And you have to find out when it happens somehow.
from cppzmq.
The implementation of zmq_send_const is kind of pointless. It constructs a message internally, uses it, and allows it to be destroyed.
I believe this is a poor implementation as it isn't really const as advertised. And thus this mess shouldn't be pushed into the C++ interface.
I am closing this ticket.
from cppzmq.
I think you misread the code. The zmq_send_const
zmq_msg_t msg;
int rc = zmq_msg_init_data (&msg, (void *)buf_, len_, NULL, NULL);
but the zmq_send
zmq_msg_t msg;
if (zmq_msg_init_size (&msg, len_))
return -1;
// We explicitly allow a send from NULL, size zero
if (len_) {
assert (buf_);
memcpy (zmq_msg_data (&msg), buf_, len_);
}
So the zmq_send
do a complete copy with malloc + memcpy but the zmq_send_const
just use a buf_
and len_
variables for sending. There is a huge performance difference between the two version.
from cppzmq.
@hun-nemethpeter sorry for bringing it to sunlight but what are the benefits of calling zmq_send
over zmq_send_const
? What's the matter with malloc
+ memcpy
? When zmq_send_const
returns, can I modify the specified (and "sent") buffer?
from cppzmq.
Related Issues (20)
- How to get client IP when in "REQ/REP" mode?
- monitor_t is not (easily) usable in composition.
- Ubuntu package doesn't seem to include the CMake configs
- zmq 4.3.5 installed with vcpkg VC2015 HOT 1
- All generic sequences for poller wait_all HOT 1
- Radio Dish UDP cppzmq HOT 2
- ZMQ_HELLO_MSG doesn't work
- Specialization of struct std::hash in different namespace
- Example doesn't compile (MacOS)
- zeromq 4.3.5 and cppzmq 4.10.0 with BUILD_DRAFT_API doesn't work with ipc and tcp on Mac Ventuta HOT 1
- Could not run cppzmq for UWP(c++ / CX) apps or (c++/ winrt) apps on Visual Studio 2022
- Linking Error while trying to compile C++ code HOT 1
- Use of deprecated methods HOT 1
- Tests fail to compile: fatal error: 'catch2/catch.hpp' file not found HOT 1
- cppzmq.pc still links the binaries with the shared library libzmq.so when the --static flag os given
- Should multipart_t documentation be updated to primarily use add to avoid reverse of traditional order? HOT 1
- Deleted copy constructor creates problems with keeping frames HOT 1
- Dealer socket, memory leak issue: The file descriptor doesn't get delete it. Too many open files descriptor
- Unable to Include cppzmq Library in OMNeT++ Project Makefile Description
- Parameter name "data" in message_t constructor reuses the method name (warning when compiling user code)
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from cppzmq.