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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads 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 "mailbox.hpp"
#include "err.hpp"
int xs::mailbox_init (mailbox_t *self_)
{
// Initlialise the signaler.
int rc = signaler_init (&self_->signaler);
if (rc != 0)
return -1;
// Get the pipe into passive state. That way, if the users starts by
// polling on the associated file descriptor it will get woken up when
// new command is posted.
bool ok = self_->cpipe.read (NULL);
xs_assert (!ok);
self_->active = false;
return 0;
}
void xs::mailbox_close (mailbox_t *self_)
{
// Deallocate the signaler.
signaler_close (&self_->signaler);
// TODO: Retrieve and deallocate commands inside the cpipe.
}
xs::fd_t xs::mailbox_fd (mailbox_t *self_)
{
return signaler_fd (&self_->signaler);
}
void xs::mailbox_send (mailbox_t *self_, const command_t &cmd_)
{
self_->sync.lock ();
self_->cpipe.write (cmd_, false);
bool ok = self_->cpipe.flush ();
self_->sync.unlock ();
if (!ok)
signaler_send (&self_->signaler);
}
int xs::mailbox_recv (mailbox_t *self_, command_t *cmd_, int timeout_)
{
// Try to get the command straight away.
if (self_->active) {
bool ok = self_->cpipe.read (cmd_);
if (ok)
return 0;
// If there are no more commands available, switch into passive state.
self_->active = false;
signaler_recv (&self_->signaler);
}
// Wait for signal from the command sender.
int rc = signaler_wait (&self_->signaler, timeout_);
if (rc != 0 && (errno == EAGAIN || errno == EINTR))
return -1;
errno_assert (rc == 0);
// We've got the signal. Now we can switch into active state.
self_->active = true;
// Get a command.
bool ok = self_->cpipe.read (cmd_);
xs_assert (ok);
return 0;
}
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