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problem: no thread-safe alternative for ZMQ_PAIR
Solution: create ZMQ_CHANNEL, the thread safe alternative
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| /* | ||
| Copyright (c) 2007-2020 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/>. | ||
| */ | ||
|
|
||
| #include "precompiled.hpp" | ||
| #include "macros.hpp" | ||
| #include "channel.hpp" | ||
| #include "err.hpp" | ||
| #include "pipe.hpp" | ||
| #include "msg.hpp" | ||
|
|
||
| zmq::channel_t::channel_t (class ctx_t *parent_, uint32_t tid_, int sid_) : | ||
| socket_base_t (parent_, tid_, sid_, true), | ||
| _pipe (NULL) | ||
| { | ||
| options.type = ZMQ_CHANNEL; | ||
| } | ||
|
|
||
| zmq::channel_t::~channel_t () | ||
| { | ||
| zmq_assert (!_pipe); | ||
| } | ||
|
|
||
| void zmq::channel_t::xattach_pipe (pipe_t *pipe_, | ||
| bool subscribe_to_all_, | ||
| bool locally_initiated_) | ||
| { | ||
| LIBZMQ_UNUSED (subscribe_to_all_); | ||
| LIBZMQ_UNUSED (locally_initiated_); | ||
|
|
||
| zmq_assert (pipe_ != NULL); | ||
|
|
||
| // ZMQ_PAIR socket can only be connected to a single peer. | ||
| // The socket rejects any further connection requests. | ||
| if (_pipe == NULL) | ||
| _pipe = pipe_; | ||
| else | ||
| pipe_->terminate (false); | ||
| } | ||
|
|
||
| void zmq::channel_t::xpipe_terminated (pipe_t *pipe_) | ||
| { | ||
| if (pipe_ == _pipe) | ||
| _pipe = NULL; | ||
| } | ||
|
|
||
| void zmq::channel_t::xread_activated (pipe_t *) | ||
| { | ||
| // There's just one pipe. No lists of active and inactive pipes. | ||
| // There's nothing to do here. | ||
| } | ||
|
|
||
| void zmq::channel_t::xwrite_activated (pipe_t *) | ||
| { | ||
| // There's just one pipe. No lists of active and inactive pipes. | ||
| // There's nothing to do here. | ||
| } | ||
|
|
||
| int zmq::channel_t::xsend (msg_t *msg_) | ||
| { | ||
| // CHANNEL sockets do not allow multipart data (ZMQ_SNDMORE) | ||
| if (msg_->flags () & msg_t::more) { | ||
| errno = EINVAL; | ||
| return -1; | ||
| } | ||
|
|
||
| if (!_pipe || !_pipe->write (msg_)) { | ||
| errno = EAGAIN; | ||
| return -1; | ||
| } | ||
|
|
||
| _pipe->flush (); | ||
|
|
||
| // Detach the original message from the data buffer. | ||
| const int rc = msg_->init (); | ||
| errno_assert (rc == 0); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| int zmq::channel_t::xrecv (msg_t *msg_) | ||
| { | ||
| // Deallocate old content of the message. | ||
| int rc = msg_->close (); | ||
| errno_assert (rc == 0); | ||
|
|
||
| if (!_pipe) { | ||
| // Initialise the output parameter to be a 0-byte message. | ||
| rc = msg_->init (); | ||
| errno_assert (rc == 0); | ||
|
|
||
| errno = EAGAIN; | ||
| return -1; | ||
| } | ||
|
|
||
| // Drop any messages with more flag | ||
| bool read = _pipe->read (msg_); | ||
| while (read && msg_->flags () & msg_t::more) { | ||
| // drop all frames of the current multi-frame message | ||
| read = _pipe->read (msg_); | ||
| while (read && msg_->flags () & msg_t::more) | ||
| read = _pipe->read (msg_); | ||
|
|
||
| // get the new message | ||
| if (read) | ||
| read = _pipe->read (msg_); | ||
| } | ||
|
|
||
| if (!read) { | ||
| // Initialise the output parameter to be a 0-byte message. | ||
| rc = msg_->init (); | ||
| errno_assert (rc == 0); | ||
|
|
||
| errno = EAGAIN; | ||
| return -1; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| bool zmq::channel_t::xhas_in () | ||
| { | ||
| if (!_pipe) | ||
| return false; | ||
|
|
||
| return _pipe->check_read (); | ||
| } | ||
|
|
||
| bool zmq::channel_t::xhas_out () | ||
| { | ||
| if (!_pipe) | ||
| return false; | ||
|
|
||
| return _pipe->check_write (); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| Copyright (c) 2007-2020 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_CHANNEL_HPP_INCLUDED__ | ||
| #define __ZMQ_CHANNEL_HPP_INCLUDED__ | ||
|
|
||
| #include "blob.hpp" | ||
| #include "socket_base.hpp" | ||
| #include "session_base.hpp" | ||
|
|
||
| namespace zmq | ||
| { | ||
| class ctx_t; | ||
| class msg_t; | ||
| class pipe_t; | ||
| class io_thread_t; | ||
|
|
||
| class channel_t ZMQ_FINAL : public socket_base_t | ||
| { | ||
| public: | ||
| channel_t (zmq::ctx_t *parent_, uint32_t tid_, int sid_); | ||
| ~channel_t (); | ||
|
|
||
| // Overrides of functions from socket_base_t. | ||
| void xattach_pipe (zmq::pipe_t *pipe_, | ||
| bool subscribe_to_all_, | ||
| bool locally_initiated_); | ||
| int xsend (zmq::msg_t *msg_); | ||
| int xrecv (zmq::msg_t *msg_); | ||
| bool xhas_in (); | ||
| bool xhas_out (); | ||
| void xread_activated (zmq::pipe_t *pipe_); | ||
| void xwrite_activated (zmq::pipe_t *pipe_); | ||
| void xpipe_terminated (zmq::pipe_t *pipe_); | ||
|
|
||
| private: | ||
| zmq::pipe_t *_pipe; | ||
|
|
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| ZMQ_NON_COPYABLE_NOR_MOVABLE (channel_t) | ||
| }; | ||
| } | ||
|
|
||
| #endif |
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