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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
// This file contains functions relating to pipes.
//
// Operations on pipes (to the transport) are generally blocking operations,
// performed in the context of the protocol.
// nni_pipe_id returns the 32-bit pipe id, which can be used in backtraces.
uint32_t
nni_pipe_id(nni_pipe *p)
{
return (p->p_id);
}
int
nni_pipe_aio_recv(nni_pipe *p, nni_aio *aio)
{
return (p->p_tran_ops.p_aio_recv(p->p_tran_data, aio));
}
int
nni_pipe_aio_send(nni_pipe *p, nni_aio *aio)
{
return (p->p_tran_ops.p_aio_send(p->p_tran_data, aio));
}
void
nni_pipe_incref(nni_pipe *p)
{
nni_mtx_lock(&p->p_mtx);
p->p_refcnt++;
nni_mtx_unlock(&p->p_mtx);
}
void
nni_pipe_decref(nni_pipe *p)
{
nni_mtx_lock(&p->p_mtx);
p->p_refcnt--;
if (p->p_refcnt == 0) {
nni_mtx_unlock(&p->p_mtx);
nni_pipe_destroy(p);
return;
}
nni_mtx_unlock(&p->p_mtx);
}
// nni_pipe_close closes the underlying connection. It is expected that
// subsequent attempts receive or send (including any waiting receive) will
// simply return NNG_ECLOSED.
void
nni_pipe_close(nni_pipe *p)
{
nni_sock *sock = p->p_sock;
nni_mtx_lock(&p->p_mtx);
if (p->p_reap == 1) {
// We already did a close.
nni_mtx_unlock(&p->p_mtx);
return;
}
p->p_reap = 1;
// Close the underlying transport.
if (p->p_tran_data != NULL) {
p->p_tran_ops.p_close(p->p_tran_data);
}
// Unregister our ID so nobody else can find it.
if (p->p_id != 0) {
nni_mtx_lock(nni_idlock);
nni_idhash_remove(nni_pipes, p->p_id);
nni_mtx_unlock(nni_idlock);
p->p_id = 0;
}
nni_mtx_unlock(&p->p_mtx);
// Let the socket (and endpoint) know we have closed.
nni_sock_pipe_closed(sock, p);
// Drop a reference count, possibly doing deferred destroy.
nni_pipe_decref(p);
}
uint16_t
nni_pipe_peer(nni_pipe *p)
{
return (p->p_tran_ops.p_peer(p->p_tran_data));
}
int
nni_pipe_create(nni_pipe **pp, nni_ep *ep, nni_sock *sock, nni_tran *tran)
{
nni_pipe *p;
void *pdata;
int rv;
if ((p = NNI_ALLOC_STRUCT(p)) == NULL) {
return (NNG_ENOMEM);
}
if ((rv = nni_mtx_init(&p->p_mtx)) != 0) {
NNI_FREE_STRUCT(p);
return (rv);
}
p->p_sock = sock;
p->p_tran_data = NULL;
p->p_proto_data = NULL;
p->p_id = 0;
NNI_LIST_NODE_INIT(&p->p_sock_node);
NNI_LIST_NODE_INIT(&p->p_ep_node);
// Make a copy of the transport ops. We can override entry points
// and we avoid an extra dereference on hot code paths.
p->p_tran_ops = *tran->tran_pipe;
// Initialize the transport pipe data.
if ((rv = p->p_tran_ops.p_init(&p->p_tran_data)) != 0) {
nni_mtx_fini(&p->p_mtx);
NNI_FREE_STRUCT(p);
return (rv);
}
if ((rv = nni_sock_pipe_add(sock, p)) != 0) {
p->p_tran_ops.p_fini(p->p_tran_data);
nni_mtx_fini(&p->p_mtx);
NNI_FREE_STRUCT(p);
return (rv);
}
*pp = p;
return (0);
}
void
nni_pipe_destroy(nni_pipe *p)
{
NNI_ASSERT(p->p_refcnt == 0);
// The caller is responsible for ensuring that the pipe
// is not in use by any other consumers. It must not be started
if (p->p_tran_data != NULL) {
p->p_tran_ops.p_fini(p->p_tran_data);
}
nni_sock_pipe_rem(p->p_sock, p);
nni_mtx_fini(&p->p_mtx);
NNI_FREE_STRUCT(p);
}
int
nni_pipe_getopt(nni_pipe *p, int opt, void *val, size_t *szp)
{
/* This should only be called with the mutex held... */
if (p->p_tran_ops.p_getopt == NULL) {
return (NNG_ENOTSUP);
}
return (p->p_tran_ops.p_getopt(p->p_tran_data, opt, val, szp));
}
int
nni_pipe_start(nni_pipe *p)
{
int rv;
nni_pipe_incref(p);
nni_mtx_lock(nni_idlock);
rv = nni_idhash_alloc(nni_pipes, &p->p_id, p);
nni_mtx_unlock(nni_idlock);
if (rv != 0) {
nni_pipe_close(p);
return (rv);
}
if ((rv = nni_sock_pipe_ready(p->p_sock, p)) != 0) {
nni_pipe_close(p);
return (rv);
}
// XXX: Publish event
return (0);
}
void
nni_pipe_set_proto_data(nni_pipe *p, void *data)
{
p->p_proto_data = data;
}
void *
nni_pipe_get_proto_data(nni_pipe *p)
{
return (p->p_proto_data);
}
void
nni_pipe_sock_list_init(nni_list *list)
{
NNI_LIST_INIT(list, nni_pipe, p_sock_node);
}
void
nni_pipe_ep_list_init(nni_list *list)
{
NNI_LIST_INIT(list, nni_pipe, p_ep_node);
}
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