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zmq_ppoll mostly mimics zmq_poll behavior, except for the added feature of being able to specify a signal mask. Signals in this mask will be blocked during execution of zmq_ppoll. Switching of the process' active signal mask happens atomically with the actual poll call, so that no race conditions can occur. This behavior is useful when one wants to gracefully handle POSIX signals without race conditions. See e.g. the discussion below https://250bpm.com/blog:12/ for an explanation. Also includes two new tests: 1. test_zmq_ppoll_fd does the same thing as test_zmq_poll_fd, demonstrating backwards compatibility with zmq_poll when used with a default signal mask. 2. test_zmq_ppoll_signals demonstrates the use of zmq_ppoll with a signal mask, blocking out SIGTERM everywhere except in zmq_ppoll, allowing to handle the signal in one place without having to worry about race conditions.
This directory holds build tools, i.e. tools we use to build the current code tree. Packaging tools (which take released tarballs or github code repos) should go into /packaging. Note: 'deprecated-msvc' contains deprecated prepared Visual Studio Solution files for various Visual Studio versions. These are no longer maintained, and may or may not work. Please use cmake instead to build with Visual Studio. Rationale: The solution and project files are hard to maintain, since there are different variants for each Visual Studio version. The tests have never been included there for this reason, so they were never usable for actual development of libzmq. If you encounter that something that worked before does not work with CMake, please open as issue at https://github.com/zeromq/libzmq/issues.