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ZeroMQ core engine in C++, implements ZMTP/3.1

Results 227 libzmq issues
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Problem: the options value maybe not thread safe for get_opt Solution: add lock for get_opt

Build all projects ``` ** BUILD SUCCEEDED ** bash-3.2# cd bin/Debug/ bash-3.2# for x in ./* ; do ./$x 1> /dev/null 2>/dev/null || echo $x ; done ./test_bind_curve_fuzzer ./test_bind_fuzzer ./test_bind_null_fuzzer...

# Issue description Cmake test suite is failing in two units. # Environment * libzmq version: 4.3.4 * OS: Linux x86/64 Test suite is failing: ```console + cd libzmq-4.3.4 +...

I'm having problems with a application blocking when calling ` zmq_ctx_destroy (context); ` . The man page for 'zmq_ctx_destroy' states: > 1. Any blocking operations currently in progress on sockets...

# Issue description TSAN reports data race on ypipe_conflate_t::reader_awake. # Environment * libzmq version (commit hash if unreleased): 4.3.4 * OS: Ubuntu 18.04 # Minimal test code / Steps to...

# Issue description When a ROUTER socket has the HANDOVER socket option set then clients connecting with the same ID as a previous client will replace that client. Problem is...

Hi team, Looking at the ZMQ documentation for PUB/SUB and XPUB/XSUB, I see the following example ![image](https://user-images.githubusercontent.com/76670147/179314164-6d9503ed-6a9e-4040-ab01-3847e79a79bd.png) ([source](https://zeromq.org/socket-api/)) Those are the official guidelines for the publish/subscribe pattern. The way I...

*Please use this template for reporting suspected bugs or requests for help.* # Issue description when use ZMQ_PUB ZMQ_SUB and set heart_beat_timout maybe crash by _io_error error message Assertion failed:...

*Please use this template for reporting suspected bugs or requests for help.* # Issue description We are using zmq inproc socket to transmit messages between threads. we are sending multipart...

I use zeromq in android ndk, using dlopen function, but the problem occurs as below: java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__aarch64_ldadd4_relax" referenced by "/data/app/~~YHS1GPE8zDNpu-WlkVhO5A==/com.xxx.xxx-9buYaMYFvN2FfDX7lD7FCA==/base.apk!/lib/arm64-v8a/libzmq.so"... I cross compile libzmq for...