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kc3-lang/libevent

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  • Author : moonlightsh
    Date : 2021-11-17 08:40:40
    Hash : 12cedc8a
    Message : Fix deadlock in case of evconnlistener_disable() in parallel with callback I've got an issue when stop evconnlistener not in the event_base_loop() thread. evconnlistener_disable() acquired lev->lock, if the same time, user callbacks is runing, the event thread released lock, after callback finished, it try to aquire the lock again, I think this makes conflict: Here is backtraces: thread 1: 0 __lll_lock_wait (futex=futex@entry=0x555555559a60, private=0) at lowlevellock.c:52 1 0x00007ffff7f2a131 in __GI___pthread_mutex_lock (mutex=0x555555559a60) at ../nptl/pthread_mutex_lock.c:115 2 0x00007ffff7f424c9 in evthread_posix_lock (mode=0, lock_=0x555555559a60) at evthread_pthread.c:79 3 0x00007ffff7f7dc12 in listener_read_cb (fd=7, what=2, p=0x5555555599a0) at listener.c:439 4 0x00007ffff7f6d758 in event_persist_closure (base=0x555555559370, ev=0x5555555599d8) at event.c:1645 5 0x00007ffff7f6da60 in event_process_active_single_queue (base=0x555555559370, activeq=0x5555555597e0, max_to_process=2147483647, endtime=0x0) at event.c:1704 6 0x00007ffff7f6e018 in event_process_active (base=0x555555559370) at event.c:1805 7 0x00007ffff7f6e92a in event_base_loop (base=0x555555559370, flags=0) at event.c:2047 8 0x0000555555555449 in main () at test_listen.c:67 thread 2: 0 futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555555559858) at ../sysdeps/nptl/futex-internal.h:183 1 __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x555555559800, cond=0x555555559830) at pthread_cond_wait.c:508 2 __pthread_cond_wait (cond=0x555555559830, mutex=0x555555559800) at pthread_cond_wait.c:638 3 0x00007ffff7f426f3 in evthread_posix_cond_wait (cond_=0x555555559830, lock_=0x555555559800, tv=0x0) at evthread_pthread.c:162 4 0x00007ffff7f70bc5 in event_del_nolock_ (ev=0x5555555599d8, blocking=2) at event.c:2934 5 0x00007ffff7f70748 in event_del_ (ev=0x5555555599d8, blocking=2) at event.c:2821 6 0x00007ffff7f707a1 in event_del (ev=0x5555555599d8) at event.c:2830 7 0x00007ffff7f7d76e in event_listener_disable (lev=0x5555555599a0) at listener.c:343 8 0x00007ffff7f7d6e5 in evconnlistener_disable (lev=0x5555555599a0) at listener.c:325 9 0x00005555555552c3 in disable_thread (arg=0x5555555599a0) at test_listen.c:27 10 0x00007ffff7f27609 in start_thread (arg=<optimized out>) at pthread_create.c:477 11 0x00007ffff7e4e293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

  • README.md

  • libevent logo

    CI linux CI windows CI mingw CI macos

    Coverage Status Join the chat at https://gitter.im/libevent/libevent doxygen

    1. BUILDING AND INSTALLATION

    Autoconf

    $ ./configure
$ make
$ make verify   # (optional)
$ sudo make install

    See Documentation/Building#Autoconf for more information

    CMake (Windows)

    Install CMake: https://www.cmake.org

    $ md build && cd build
$ cmake -G "Visual Studio 10" ..   # Or use any generator you want to use. Run cmake --help for a list
$ cmake --build . --config Release # Or "start libevent.sln" and build with menu in Visual Studio.

    See Documentation/Building#Building on Windows for more information

    CMake (Unix)

    $ mkdir build && cd build
$ cmake ..     # Default to Unix Makefiles.
$ make
$ make verify  # (optional)

    See Documentation/Building#Building on Unix (With CMake) for more information

    Package Managers

    You can download and install libevent using the vcpkg dependency manager:

    git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install libevent

    The libevent port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

    2. USEFUL LINKS:

    For the latest released version of Libevent, see the official website at http://libevent.org/ .

    There's a pretty good work-in-progress manual up at http://www.wangafu.net/~nickm/libevent-book/ .

    For the latest development versions of Libevent, access our Git repository via

    $ git clone https://github.com/libevent/libevent.git

    You can browse the git repository online at:

    https://github.com/libevent/libevent

    To report bugs, issues, or ask for new features:

    Patches: https://github.com/libevent/libevent/pulls

    OK, those are not really patches. You fork, modify, and hit the "Create Pull Request" button. You can still submit normal git patches via the mailing list.

    Bugs, Features [RFC], and Issues: https://github.com/libevent/libevent/issues

    Or you can do it via the mailing list.

    There's also a libevent-users mailing list for talking about Libevent use and development:

    http://archives.seul.org/libevent/users/

    3. ACKNOWLEDGMENTS

    The following people have helped with suggestions, ideas, code or fixing bugs.