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Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/signaler.hpp')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/signaler.hpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/signaler.hpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/signaler.hpp new file mode 100644 index 00000000..1ab25dc2 --- /dev/null +++ b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/signaler.hpp @@ -0,0 +1,90 @@ +/* + Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file + + This file is part of libzmq, the ZeroMQ core engine in C++. + + libzmq is free software; you can redistribute it and/or modify it under + the terms of the GNU Lesser General Public License (LGPL) as published + by the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + As a special exception, the Contributors give you permission to link + this library with independent modules to produce an executable, + regardless of the license terms of these independent modules, and to + copy and distribute the resulting executable under terms of your choice, + provided that you also meet, for each linked independent module, the + terms and conditions of the license of that module. An independent + module is a module which is not derived from or based on this library. + If you modify this library, you must extend this exception to your + version of the library. + + libzmq is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef __ZMQ_SIGNALER_HPP_INCLUDED__ +#define __ZMQ_SIGNALER_HPP_INCLUDED__ + +#ifdef HAVE_FORK +#include <unistd.h> +#endif + +#include "fd.hpp" + +namespace zmq +{ + + // This is a cross-platform equivalent to signal_fd. However, as opposed + // to signal_fd there can be at most one signal in the signaler at any + // given moment. Attempt to send a signal before receiving the previous + // one will result in undefined behaviour. + + class signaler_t + { + public: + + signaler_t (); + ~signaler_t (); + + fd_t get_fd () const; + void send (); + int wait (int timeout_); + void recv (); + +#ifdef HAVE_FORK + // close the file descriptors in a forked child process so that they + // do not interfere with the context in the parent process. + void forked (); +#endif + + private: + + // Creates a pair of filedescriptors that will be used + // to pass the signals. + static int make_fdpair (fd_t *r_, fd_t *w_); + + // Underlying write & read file descriptor + // Will be -1 if we exceeded number of available handles + fd_t w; + fd_t r; + + // Disable copying of signaler_t object. + signaler_t (const signaler_t&); + const signaler_t &operator = (const signaler_t&); + +#ifdef HAVE_FORK + // the process that created this context. Used to detect forking. + pid_t pid; + // idempotent close of file descriptors that is safe to use by destructor + // and forked(). + void close_internal (); +#endif + }; +} + +#endif |