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03c28411d8
The problem is that other threads might still be in mailbox::send() when it is destroyed. So as a workaround, we just acquire the mutex in the destructor. Therefore the running send will finish before the mailbox is destroyed. See also the fix for LIBZMQ-281 in zeromq2-x. Signed-off-by: Mika Fischer <mika.fischer@zoopnet.de>
86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
/*
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Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mailbox.hpp"
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#include "err.hpp"
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zmq::mailbox_t::mailbox_t ()
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{
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// Get the pipe into passive state. That way, if the users starts by
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// polling on the associated file descriptor it will get woken up when
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// new command is posted.
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bool ok = cpipe.read (NULL);
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zmq_assert (!ok);
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active = false;
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}
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zmq::mailbox_t::~mailbox_t ()
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{
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// TODO: Retrieve and deallocate commands inside the cpipe.
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// Work around problem that other threads might still be in our
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// send() method, by waiting on the mutex before disappearing.
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sync.lock ();
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sync.unlock ();
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}
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zmq::fd_t zmq::mailbox_t::get_fd ()
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{
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return signaler.get_fd ();
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}
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void zmq::mailbox_t::send (const command_t &cmd_)
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{
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sync.lock ();
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cpipe.write (cmd_, false);
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bool ok = cpipe.flush ();
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sync.unlock ();
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if (!ok)
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signaler.send ();
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}
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int zmq::mailbox_t::recv (command_t *cmd_, int timeout_)
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{
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// Try to get the command straight away.
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if (active) {
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bool ok = cpipe.read (cmd_);
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if (ok)
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return 0;
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// If there are no more commands available, switch into passive state.
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active = false;
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signaler.recv ();
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}
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// Wait for signal from the command sender.
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int rc = signaler.wait (timeout_);
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if (rc != 0 && (errno == EAGAIN || errno == EINTR))
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return -1;
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// We've got the signal. Now we can switch into active state.
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active = true;
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// Get a command.
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errno_assert (rc == 0);
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bool ok = cpipe.read (cmd_);
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zmq_assert (ok);
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return 0;
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}
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