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108 lines
3.3 KiB
108 lines
3.3 KiB
/*
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Copyright (c) 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 "dist.h"
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#include "../../utils/err.h"
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#include "../../utils/cont.h"
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#include "../../utils/fast.h"
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#include "../../utils/attr.h"
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#include <stddef.h>
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void nn_dist_init (struct nn_dist *self)
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{
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self->count = 0;
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nn_list_init (&self->pipes);
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}
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void nn_dist_term (struct nn_dist *self)
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{
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nn_assert (self->count == 0);
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nn_list_term (&self->pipes);
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}
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void nn_dist_add (NN_UNUSED struct nn_dist *self,
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struct nn_dist_data *data, struct nn_pipe *pipe)
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{
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data->pipe = pipe;
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nn_list_item_init (&data->item);
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}
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void nn_dist_rm (struct nn_dist *self, struct nn_dist_data *data)
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{
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if (nn_list_item_isinlist (&data->item)) {
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--self->count;
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nn_list_erase (&self->pipes, &data->item);
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}
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nn_list_item_term (&data->item);
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}
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void nn_dist_out (struct nn_dist *self, struct nn_dist_data *data)
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{
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++self->count;
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nn_list_insert (&self->pipes, &data->item, nn_list_end (&self->pipes));
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}
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int nn_dist_send (struct nn_dist *self, struct nn_msg *msg,
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struct nn_pipe *exclude)
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{
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int rc;
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struct nn_list_item *it;
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struct nn_dist_data *data;
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struct nn_msg copy;
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/* TODO: We can optimise for the case when there's only one outbound
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pipe here. No message copying is needed in such case. */
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/* In the specific case when there are no outbound pipes. There's nowhere
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to send the message to. Deallocate it. */
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if (nn_slow (self->count) == 0) {
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nn_msg_term (msg);
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return 0;
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}
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/* Send the message to all the subscribers. */
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nn_msg_bulkcopy_start (msg, self->count);
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it = nn_list_begin (&self->pipes);
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while (it != nn_list_end (&self->pipes)) {
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data = nn_cont (it, struct nn_dist_data, item);
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nn_msg_bulkcopy_cp (©, msg);
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if (nn_fast (data->pipe == exclude)) {
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nn_msg_term (©);
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}
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else {
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rc = nn_pipe_send (data->pipe, ©);
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errnum_assert (rc >= 0, -rc);
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if (rc & NN_PIPE_RELEASE) {
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--self->count;
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it = nn_list_erase (&self->pipes, it);
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continue;
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}
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}
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it = nn_list_next (&self->pipes, it);
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}
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nn_msg_term (msg);
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return 0;
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}
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