| /* |
| Copyright (c) 2012-2013 Martin Sustrik All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "excl.h" |
| |
| #include "../../utils/fast.h" |
| #include "../../utils/err.h" |
| #include "../../utils/attr.h" |
| |
| void nn_excl_init (struct nn_excl *self) |
| { |
| self->pipe = NULL; |
| self->inpipe = NULL; |
| self->outpipe = NULL; |
| } |
| |
| void nn_excl_term (struct nn_excl *self) |
| { |
| nn_assert (!self->pipe); |
| nn_assert (!self->inpipe); |
| nn_assert (!self->outpipe); |
| } |
| |
| int nn_excl_add (struct nn_excl *self, struct nn_pipe *pipe) |
| { |
| /* If there's a connection being used, reject any new connection. */ |
| if (self->pipe) |
| return -EISCONN; |
| |
| /* Remember that this pipe is the active one. */ |
| self->pipe = pipe; |
| |
| return 0; |
| } |
| |
| void nn_excl_rm (struct nn_excl *self, NN_UNUSED struct nn_pipe *pipe) |
| { |
| nn_assert (self->pipe); |
| self->pipe = NULL; |
| self->inpipe = NULL; |
| self->outpipe = NULL; |
| } |
| |
| void nn_excl_in (struct nn_excl *self, struct nn_pipe *pipe) |
| { |
| nn_assert (!self->inpipe); |
| nn_assert (pipe == self->pipe); |
| self->inpipe = pipe; |
| } |
| |
| void nn_excl_out (struct nn_excl *self, struct nn_pipe *pipe) |
| { |
| nn_assert (!self->outpipe); |
| nn_assert (pipe == self->pipe); |
| self->outpipe = pipe; |
| } |
| |
| int nn_excl_send (struct nn_excl *self, struct nn_msg *msg) |
| { |
| int rc; |
| |
| if (nn_slow (!self->outpipe)) |
| return -EAGAIN; |
| |
| rc = nn_pipe_send (self->outpipe, msg); |
| errnum_assert (rc >= 0, -rc); |
| |
| if (rc & NN_PIPE_RELEASE) |
| self->outpipe = NULL; |
| |
| return rc & ~NN_PIPE_RELEASE; |
| } |
| |
| int nn_excl_recv (struct nn_excl *self, struct nn_msg *msg) |
| { |
| int rc; |
| |
| if (nn_slow (!self->inpipe)) |
| return -EAGAIN; |
| |
| rc = nn_pipe_recv (self->inpipe, msg); |
| errnum_assert (rc >= 0, -rc); |
| |
| if (rc & NN_PIPE_RELEASE) |
| self->inpipe = NULL; |
| |
| return rc & ~NN_PIPE_RELEASE; |
| } |
| |
| int nn_excl_can_send (struct nn_excl *self) |
| { |
| return self->outpipe ? 1 : 0; |
| } |
| |
| int nn_excl_can_recv (struct nn_excl *self) |
| { |
| return self->inpipe ? 1 : 0; |
| } |
| |