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//
// Copyright 2016 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_send(nni_pipe *p, nng_msg *msg)
{
return (p->p_ops.p_send(p->p_trandata, msg));
}
int
nni_pipe_recv(nni_pipe *p, nng_msg **msgp)
{
return (p->p_ops.p_recv(p->p_trandata, msgp));
}
// 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_socket *sock = p->p_sock;
p->p_ops.p_close(p->p_trandata);
nni_mutex_enter(&sock->s_mx);
if (!p->p_reap) {
// schedule deferred reap/close
p->p_reap = 1;
if (p->p_active) {
nni_list_remove(&sock->s_pipes, p);
p->p_active = 0;
}
nni_list_append(&sock->s_reaps, p);
nni_cond_broadcast(&sock->s_cv);
}
nni_mutex_exit(&sock->s_mx);
}
uint16_t
nni_pipe_peer(nni_pipe *p)
{
return (p->p_ops.p_peer(p->p_trandata));
}
void
nni_pipe_destroy(nni_pipe *p)
{
if (p->p_send_thr != NULL) {
nni_thread_reap(p->p_send_thr);
}
if (p->p_recv_thr != NULL) {
nni_thread_reap(p->p_recv_thr);
}
if (p->p_trandata != NULL) {
p->p_ops.p_destroy(p->p_trandata);
}
nni_cond_fini(&p->p_cv);
if (p->p_pdata != NULL) {
nni_free(p->p_pdata, p->p_psize);
}
nni_free(p, sizeof (*p));
}
int
nni_pipe_create(nni_pipe **pp, nni_endpt *ep)
{
nni_pipe *p;
nni_socket *sock = ep->ep_sock;
int rv;
if ((p = nni_alloc(sizeof (*p))) == NULL) {
return (NNG_ENOMEM);
}
p->p_send_thr = NULL;
p->p_recv_thr = NULL;
p->p_trandata = NULL;
p->p_active = 0;
p->p_abort = 0;
if ((rv = nni_cond_init(&p->p_cv, &sock->s_mx)) != 0) {
nni_free(p, sizeof (*p));
return (rv);
}
p->p_psize = sock->s_ops.proto_pipe_size;
if ((p->p_pdata = nni_alloc(p->p_psize)) == NULL) {
nni_cond_fini(&p->p_cv);
nni_free(p, sizeof (*p));
return (NNG_ENOMEM);
}
p->p_sock = sock;
p->p_ops = *ep->ep_ops.ep_pipe_ops;
NNI_LIST_NODE_INIT(&p->p_node);
*pp = p;
return (0);
}
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_ops.p_getopt == NULL) {
return (NNG_ENOTSUP);
}
return (p->p_ops.p_getopt(p->p_trandata, opt, val, szp));
}
static void
nni_pipe_sender(void *arg)
{
nni_pipe *p = arg;
nni_mutex_enter(&p->p_sock->s_mx);
while ((!p->p_active) && (!p->p_abort)) {
nni_cond_wait(&p->p_cv);
}
if (p->p_abort) {
nni_mutex_exit(&p->p_sock->s_mx);
return;
}
nni_mutex_exit(&p->p_sock->s_mx);
if (p->p_sock->s_ops.proto_pipe_send != NULL) {
p->p_sock->s_ops.proto_pipe_send(p->p_pdata);
}
}
static void
nni_pipe_receiver(void *arg)
{
nni_pipe *p = arg;
nni_mutex_enter(&p->p_sock->s_mx);
while ((!p->p_active) && (!p->p_abort)) {
nni_cond_wait(&p->p_cv);
}
if (p->p_abort) {
nni_mutex_exit(&p->p_sock->s_mx);
return;
}
nni_mutex_exit(&p->p_sock->s_mx);
if (p->p_sock->s_ops.proto_pipe_recv != NULL) {
p->p_sock->s_ops.proto_pipe_recv(p->p_pdata);
}
}
int
nni_pipe_start(nni_pipe *pipe)
{
int rv;
int collide;
nni_socket *sock = pipe->p_sock;
nni_mutex_enter(&sock->s_mx);
if (sock->s_closing) {
nni_mutex_exit(&sock->s_mx);
return (NNG_ECLOSED);
}
do {
// We generate a new pipe ID, but we make sure it does not
// collide with any we already have. This can only normally
// happen if we wrap -- i.e. we've had 4 billion or so pipes.
// XXX: consider making this a hash table!!
nni_pipe *check;
pipe->p_id = nni_plat_nextid() & 0x7FFFFFFF;
collide = 0;
NNI_LIST_FOREACH (&sock->s_pipes, check) {
if (check->p_id == pipe->p_id) {
collide = 1;
break;
}
}
} while (collide);
rv = nni_thread_create(&pipe->p_send_thr, nni_pipe_sender, pipe);
if (rv != 0) {
goto fail;
}
rv = nni_thread_create(&pipe->p_recv_thr, nni_pipe_receiver, pipe);
if (rv != 0) {
goto fail;
}
rv = sock->s_ops.proto_add_pipe(sock->s_data, pipe, pipe->p_pdata);
if (rv != 0) {
goto fail;
}
nni_list_append(&sock->s_pipes, pipe);
pipe->p_active = 1;
// XXX: Publish event
nni_cond_broadcast(&pipe->p_cv);
nni_mutex_exit(&sock->s_mx);
return (0);
fail:
pipe->p_abort = 1;
pipe->p_reap = 1;
nni_list_append(&sock->s_reaps, pipe);
nni_cond_broadcast(&sock->s_cv);
nni_cond_broadcast(&pipe->p_cv);
nni_mutex_exit(&sock->s_mx);
return (rv);
}
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