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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 <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
//
// Pair protocol. The PAIR protocol is a simple 1:1 messaging pattern.
//
// An nni_pair_sock is our per-socket protocol private structure.
typedef struct nni_pair_sock {
nni_socket_t sock;
nni_mutex_t mx;
nni_pipe_t pipe;
nni_msgqueue_t uwq;
nni_msgqueue_t urq;
} nni_pair_sock;
// An nni_pair_pipe is our per-pipe protocol private structure. We keep
// one of these even though in theory we'd only have a single underlying
// pipe. The separate data structure is more like other protocols that do
// manage multiple pipes.
typedef struct nni_pair_pipe {
nni_pipe_t pipe;
nni_pair_sock * pair;
int good;
nni_thread_t sthr;
nni_thread_t rthr;
int sigclose;
} nni_pair_pipe;
static void nni_pair_receiver(void *);
static void nni_pair_sender(void *);
static int
nni_pair_create(void **pairp, nni_socket_t sock)
{
nni_pair_sock *pair;
int rv;
if ((pair = nni_alloc(sizeof (*pair))) == NULL) {
return (NNG_ENOMEM);
}
if ((rv = nni_mutex_create(&pair->mx)) != 0) {
nni_free(pair, sizeof (*pair));
return (rv);
}
pair->sock = sock;
pair->uwq = nni_socket_sendq(sock);
pair->urq = nni_socket_recvq(sock);
*pairp = pair;
return (0);
}
static void
nni_pair_destroy(void *arg)
{
nni_pair_sock *pair = arg;
nni_mutex_destroy(pair->mx);
nni_free(pair, sizeof (*pair));
}
static void
nni_pair_shutdown(void *arg, uint64_t usec)
{
nni_pair_sock *pair = arg;
nni_pipe_t pipe;
NNI_ARG_UNUSED(usec);
// XXX: correct implementation here is to set a draining flag,
// and wait a bit for the sender to finish draining (linger),
// then reap the pipe. For now we just act a little more harshly.
nni_mutex_enter(pair->mx);
pipe = pair->pipe;
pair->pipe = NULL;
nni_mutex_exit(pair->mx);
nni_pipe_close(pipe);
}
static int
nni_pair_add_pipe(void *arg, nni_pipe_t pipe)
{
nni_pair_sock *pair = arg;
nni_pair_pipe *pp;
int rv;
pp = nni_alloc(sizeof (*pp));
pp->pipe = pipe;
pp->good = 0;
pp->sigclose = 0;
pp->sthr = NULL;
pp->rthr = NULL;
nni_mutex_enter(pair->mx);
if (pair->pipe != NULL) {
// Already have a peer, denied.
nni_mutex_exit(pair->mx);
nni_free(pp, sizeof (*pp));
return (NNG_EBUSY);
}
if ((rv = nni_thread_create(&pp->rthr, nni_pair_receiver, pp)) != 0) {
nni_mutex_exit(pair->mx);
return (rv);
}
if ((rv = nni_thread_create(&pp->sthr, nni_pair_sender, pp)) != 0) {
nni_mutex_exit(pair->mx);
return (rv);
}
pp->good = 1;
pair->pipe = pipe;
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
static int
nni_pair_rem_pipe(void *arg, nni_pipe_t pipe)
{
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
if (pp->sthr) {
(void) nni_thread_reap(pp->sthr);
}
if (pp->rthr) {
(void) nni_thread_reap(pp->rthr);
}
nni_mutex_enter(pair->mx);
if (pair->pipe != pipe) {
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
nni_mutex_exit(pair->mx);
return (NNG_EINVAL);
}
static void
nni_pair_sender(void *arg)
{
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
nni_msgqueue_t uwq = pair->uwq;
nni_msgqueue_t urq = pair->urq;
nni_pipe_t pipe = pp->pipe;
nni_msg_t msg;
int rv;
nni_mutex_enter(pair->mx);
if (!pp->good) {
nni_mutex_exit(pair->mx);
return;
}
nni_mutex_exit(pair->mx);
for (;;) {
rv = nni_msgqueue_get_sig(uwq, &msg, -1, &pp->sigclose);
if (rv != 0) {
break;
}
rv = nni_pipe_send(pipe, msg);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(urq, &pp->sigclose);
nni_pipe_close(pipe);
nni_socket_remove_pipe(pair->sock, pipe);
}
static void
nni_pair_receiver(void *arg)
{
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
nni_msgqueue_t urq = pair->urq;
nni_msgqueue_t uwq = pair->uwq;
nni_pipe_t pipe = pp->pipe;
nni_msg_t msg;
int rv;
nni_mutex_enter(pair->mx);
if (!pp->good) {
nni_mutex_exit(pair->mx);
return;
}
nni_mutex_exit(pair->mx);
for (;;) {
rv = nni_pipe_recv(pipe, &msg);
if (rv != 0) {
break;
}
rv = nni_msgqueue_put_sig(urq, msg, -1, &pp->sigclose);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgqueue_signal(uwq, &pp->sigclose);
nni_pipe_close(pipe);
nni_socket_remove_pipe(pair->sock, pipe);
}
static int
nni_pair_setopt(void *arg, int opt, const void *buf, size_t sz)
{
return (NNG_ENOTSUP);
}
static int
nni_pair_getopt(void *arg, int opt, void *buf, size_t *szp)
{
return (NNG_ENOTSUP);
}
// This is the global protocol structure -- our linkage to the core.
// This should be the only global non-static symbol in this file.
struct nni_protocol nni_pair_protocol = {
NNG_PROTO_PAIR, // proto_self
NNG_PROTO_PAIR, // proto_peer
"pair",
nni_pair_create,
nni_pair_destroy,
nni_pair_shutdown,
nni_pair_add_pipe,
nni_pair_rem_pipe,
nni_pair_setopt,
nni_pair_getopt,
NULL, // proto_recvfilter
NULL, // proto_sendfilter
};
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