[Boost-bugs] [Boost C++ Libraries] #13335: When using unix domain socket (boost::asio::local::stream_protocol), synchronous write may not respond sometimes on macOS

Subject: [Boost-bugs] [Boost C++ Libraries] #13335: When using unix domain socket (boost::asio::local::stream_protocol), synchronous write may not respond sometimes on macOS
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-12-11 06:48:39

#13335: When using unix domain socket (boost::asio::local::stream_protocol),
synchronous write may not respond sometimes on macOS
------------------------------+----------------------------
 Reporter:  seungrye@…        |      Owner:  chris_kohlhoff
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  asio
  Version:  Boost 1.65.0      |   Severity:  Problem
 Keywords:  UDS, poll         |
------------------------------+----------------------------
 In very intermittent situations, synchronous write does not wake up in the
 following situations:

 1. The server application uses a unix domain socket and accepts and reads
 asynchronously.
 2. The client application uses a unix domain socket, and there is a thread
 that performs synchronous write repeatedly. Disconnect and reconnect at
 any time.

 There is no issue when checking on Windows / Mac with tcp socket.
 UDS (boost::asio::local::stream_protocol) has issue when checking on Mac.

 When testing with boost library 1.62.0 and 1.65.0 in macOS 10.12
 environment, I confirmed that an issue occurred.

 The source code of the function with no response is as follows.

 {{{
 int poll_write (socket_type s, state_type state, boost :: system ::
 error_code & ec)
 {
 Â Â if (s == invalid_socket)
 Â Â {
 Â Â Â Â ec = boost :: asio :: error :: bad_descriptor;
 Â Â Â Â return socket_error_retval;
 Â Â }

 #if defined (BOOST_ASIO_WINDOWS) \
 Â Â || defined (__ CYGWIN__) \
 Â Â || defined (__ SYMBIAN32__)
 ...
 #else // defined (BOOST_ASIO_WINDOWS)
 Â Â Â Â Â Â // || defined (__ CYGWIN__)
 Â Â Â Â Â Â // || defined (__ SYMBIAN32__)
 Â Â pollfd fds;
 Â Â fds.fd = s;
 Â Â FDS.Events = POLLOUT;
 Â Â FDS.revents = 0;
 Â Â int timeout = (state & user_set_non_blocking)? 0: -1;
 Â Â clear_last_error ();
 Â Â int result = error_wrapper (:: poll (& fds, 1, timeout), ec); //!!!
 ::poll is not wakeup even if socket cancelled and closed
 #endif // defined (BOOST_ASIO_WINDOWS)
 Â Â Â Â Â Â Â // || defined (__ CYGWIN__)
 Â Â Â Â Â Â Â // || defined (__ SYMBIAN32__)
 ...
 }
 }}}

 Attached test project. (xcode 8.3 project)

 The following settings should be changed as appropriate.
 * Modify the "Link Binary With Libraries" of "Build Phases" as appropriate
 for both server / client projects.
 * Modify the "Header Search Paths" and "Library Search Path" of the Build
 Settings as appropriate for both server / client projects.

 I do not speak English well so I used Google translation.
 Therefore, the contents may be awkward. I hope you understand.
 And, I hope this issue is resolved.

 ''Note. I used the compiled library.
 Compilation builds version 1.65.0 using the ofxOSXBoost (on GitHub) script
 (build-libc ++ withBitcode).''

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13335>
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