zeromq

How to create ZeroMQ socket suitable both for sending and consuming?

由 浪尽此生 提交于 2021-01-01 09:21:28
问题 Could you please advice an ZeroMQ socket(s) architecture for the following scenario: 1) there is server listening on port 2) there are several clients connecting server simultaneously 3) server accept all connections from clients and provide bi-directional queue for each client, means both party (client N or server) can send or consume messages, i.e. both party can be INITIATOR of the communication and other party should have a callback to process the message. Should we create additional

How to create ZeroMQ socket suitable both for sending and consuming?

由 ℡╲_俬逩灬. 提交于 2021-01-01 09:21:11
问题 Could you please advice an ZeroMQ socket(s) architecture for the following scenario: 1) there is server listening on port 2) there are several clients connecting server simultaneously 3) server accept all connections from clients and provide bi-directional queue for each client, means both party (client N or server) can send or consume messages, i.e. both party can be INITIATOR of the communication and other party should have a callback to process the message. Should we create additional

zeromq总结

由 爷，独闯天下 提交于 2020-12-30 17:57:07
概述 我们真正需要的是这样一种消息软件，它能够做大型消息软件所能做的一切，但使用起来又非常简单，成本很低，可以用到所有的应用程序中，没有任何依赖条件。因为没有了额外的模块，就降低了出错的概率。这种软件需要能够在所有的操作系统上运行，并能支持所有的编程语言。 ZMQ就是这样一种软件：它高效，提供了嵌入式的类库，使应用程序能够很好地在网络中扩展，成本低廉。 ZMQ的主要特点有： ZMQ会在后台线程异步地处理I/O操作，它使用一种不会死锁的数据结构来存储消息。 网络组件可以来去自如，ZMQ会负责自动重连，这就意味着你可以以任何顺序启动组件；用它创建的面向服务架构（SOA）中，服务端可以随意地加入或退出网络。 ZMQ会在有必要的情况下自动将消息放入队列中保存，一旦建立了连接就开始发送。 ZMQ有阈值（HWM）的机制，可以避免消息溢出。当队列已满，ZMQ会自动阻塞发送者，或丢弃部分消息，这些行为取决于你所使用的消息模式。 ZMQ可以让你用不同的通信协议进行连接，如TCP、广播、进程内、进程间。改变通信协议时你不需要去修改代码。 ZMQ会恰当地处理速度较慢的节点，会根据消息模式使用不同的策略。 ZMQ提供了多种模式进行消息路由，如请求-应答模式、发布-订阅模式等。这些模式可以用来搭建网络拓扑结构。 ZMQ中可以根据消息模式建立起一些中间装置（很小巧），可以用来降低网络的复杂程度。

GNU Radio OOT block : AttributeError: 'module' object has no attribute 'pthread' (using ZeroMQ sockets)

由 与世无争的帅哥 提交于 2020-12-15 08:38:07
问题 I've developed an Out of tree block in GNU Radio with C++. I'm using the ZMQ sockets,which are implemented with the <zmq.hpp> library, to pass data through two threads. When I try to execute my OOT block (pthread block) in GNU Radio companion, what it appears is: AttributeError: 'module' object has no attribute 'pthread'. Traceback (most recent call last): File "/home/itupac/workarea-gnuradio/Labs/pthread/top_block.py", line 161, in <module> main() File "/home/itupac/workarea-gnuradio/Labs

GNU Radio OOT block : AttributeError: 'module' object has no attribute 'pthread' (using ZeroMQ sockets)

由 一个人想着一个人 提交于 2020-12-15 08:38:06
问题 I've developed an Out of tree block in GNU Radio with C++. I'm using the ZMQ sockets,which are implemented with the <zmq.hpp> library, to pass data through two threads. When I try to execute my OOT block (pthread block) in GNU Radio companion, what it appears is: AttributeError: 'module' object has no attribute 'pthread'. Traceback (most recent call last): File "/home/itupac/workarea-gnuradio/Labs/pthread/top_block.py", line 161, in <module> main() File "/home/itupac/workarea-gnuradio/Labs

GNU Radio OOT block : AttributeError: 'module' object has no attribute 'pthread' (using ZeroMQ sockets)

由 白昼怎懂夜的黑 提交于 2020-12-15 08:35:01
问题 I've developed an Out of tree block in GNU Radio with C++. I'm using the ZMQ sockets,which are implemented with the <zmq.hpp> library, to pass data through two threads. When I try to execute my OOT block (pthread block) in GNU Radio companion, what it appears is: AttributeError: 'module' object has no attribute 'pthread'. Traceback (most recent call last): File "/home/itupac/workarea-gnuradio/Labs/pthread/top_block.py", line 161, in <module> main() File "/home/itupac/workarea-gnuradio/Labs

How configure a Multiple PUB/ single SUB python ZMQ Ubuntu

由 不羁的心 提交于 2020-12-15 06:27:07
问题 I have two VMs (VirtualBOx, Ubuntu 18.04 and python-zmq[16.0.2-2build2]) running within the same physical machine (Win10). Both machines are configured as Bridge and they can be ping successfully 192.168.1.66-192.168.1.55. I've followed this tutorial https://learning-0mq-with-pyzmq.readthedocs.io/en/latest/pyzmq/patterns/pubsub.html. It works if PUB (server) is configured as import zmq import random import sys import time port = "5557" if len(sys.argv) > 1: port = sys.argv[1] int(port)

How configure a Multiple PUB/ single SUB python ZMQ Ubuntu

由 喜夏-厌秋 提交于 2020-12-15 06:26:07
问题 I have two VMs (VirtualBOx, Ubuntu 18.04 and python-zmq[16.0.2-2build2]) running within the same physical machine (Win10). Both machines are configured as Bridge and they can be ping successfully 192.168.1.66-192.168.1.55. I've followed this tutorial https://learning-0mq-with-pyzmq.readthedocs.io/en/latest/pyzmq/patterns/pubsub.html. It works if PUB (server) is configured as import zmq import random import sys import time port = "5557" if len(sys.argv) > 1: port = sys.argv[1] int(port)

App crashes when it takes too long to reply in a ZMQ REQ/REP pattern

由 断了今生、忘了曾经 提交于 2020-12-15 05:49:05
问题 I am writing a plugin that interfaces with a desktop application through a ZeroMQ REQ/REP request-reply communication archetype. I can currently receive a request, but the application seemingly crashes if a reply is not sent quick enough. I receive the request on a spawned thread and put it in a queue. This queue is processed in another thread, in which the processing function is invoked by the application periodically. The message is correctly being received and processed, but the response

linux多线程下的fwrite和write使用详解

由 ぃ、小莉子 提交于 2020-12-11 23:59:25
Linux下的文件操作，有人喜欢用C库的文件流操作，有人喜欢用Linux的原生的系统调用。一般来说，C库的文件操作会更高效一些，因为C库自己做了文件缓存的处理。今天，主要研究多线程下的fwrite与write，每个线程都对相同的FILE*或者fd进行写操作，看看结果是否为预期行为。 第一种情况：使用C库的fwrite，其线程的实现如下： 第二种情况：使用系统调用write，其线程的实现如下： 下面看主线程的实现： 其中LOOPS定义为1000000。也就是说，线程1~3分别写入"aaaaaa\n"，“bbbbbb\n”，和"cccccc\n"各一百万次。如果写入文件的操作是“线程安全”的，那么最终的文件行数应该是3百万行，且每行只可能是"aaaaaa"、“bbbbbb”、和"cccccc"的一种。 【文章福利】需要C/C++ Linux服务器架构师学习资料加群812855908（资料包括C/C++，Linux，golang技术，Nginx，ZeroMQ，MySQL，Redis，fastdfs，MongoDB，ZK，流媒体，CDN，P2P，K8S，Docker，TCP/IP，协程，DPDK，ffmpeg等） 接下来看测试结果： 1、定义了宏USE_CLIB，即使用C库的fwrite，其结果如下： 2、注释掉红USE_CLIB，即直接使用系统调用write，其结果如下：
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