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