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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 "convey.h"
#include "nng.h"
#include <string.h>
static int count = 1;
static int nthrs = 100;
static char *addr = "inproc:///atscale";
static void
client(void *arg)
{
int *result = arg;
nng_socket s;
int rv;
uint64_t timeo;
nng_msg *msg;
int i;
*result = 0;
if ((rv = nng_open(&s, NNG_PROTO_REQ)) != 0) {
*result = rv;
return;
}
if ((rv = nng_dial(s, addr, NULL, NNG_FLAG_SYNCH)) != 0) {
*result = rv;
nng_close(s);
return;
}
timeo = 4000000; // 4 seconds
if (((rv = nng_setopt(s, NNG_OPT_RCVTIMEO, &timeo, sizeof (timeo))) != 0) ||
((rv = nng_setopt(s, NNG_OPT_SNDTIMEO, &timeo, sizeof (timeo))) != 0)) {
*result = rv;
nng_close(s);
return;
}
// Sleep for up to a 10ms before issuing requests to avoid saturating
// the CPU with bazillions of requests at the same time.
nng_usleep(10000);
for (i = 0; i < count; i++) {
// Sleep for up to a 1ms before issuing requests to
// avoid saturating the CPU with bazillions of requests at
// the same time.
nng_usleep(rand() % 1000);
// Reusing the same message causes problems as a result of
// header reuse.
if ((rv = nng_msg_alloc(&msg, 0)) != 0) {
*result = rv;
nng_close(s);
return;
}
if ((rv = nng_sendmsg(s, msg, 0)) != 0) {
*result = rv;
nng_msg_free(msg);
nng_close(s);
return;
}
if ((rv = nng_recvmsg(s, &msg, 0)) != 0) {
*result = rv;
nng_close(s);
return;
}
nng_msg_free(msg);
}
nng_close(s);
*result = 0;
}
void
serve(void *arg)
{
nng_socket rep = *(nng_socket *)arg;
nng_msg *msg;
for (;;) {
if (nng_recvmsg(rep, &msg, 0) != 0) {
nng_close(rep);
return;
}
if (nng_sendmsg(rep, msg, 0) != 0) {
nng_close(rep);
return;
}
}
}
Main({
int rv;
void **clients;
void *server;
int *results;
clients = calloc(nthrs, sizeof (void *));
results = calloc(nthrs, sizeof (int));
Test("Scalability", {
Convey("Given a server socket", {
nng_socket rep;
int depth = 256;
So(nng_open(&rep, NNG_PROTO_REP) == 0);
Reset({
nng_close(rep);
})
So(nng_setopt(rep, NNG_OPT_RCVBUF, &depth, sizeof (depth)) == 0);
So(nng_setopt(rep, NNG_OPT_SNDBUF, &depth, sizeof (depth)) == 0);
So(nng_listen(rep, addr, NULL, NNG_FLAG_SYNCH) == 0);
So(nng_thread_create(&server, serve, &rep) == 0);
nng_usleep(100000);
Convey("We can run many many clients", {
int fails = 0;
int i;
for (i = 0; i < nthrs; i++) {
if ((rv = nng_thread_create(&clients[i], client, &results[i])) != 0) {
printf("thread create failed: %s", nng_strerror(rv));
break;
}
}
So(i == nthrs);
for (i = 0; i < nthrs; i++) {
nng_thread_destroy(clients[i]);
fails += (results[i] == 0 ? 0 : 1);
if (results[i] != 0) {
printf("%d (%d): %s\n",
fails, i,
nng_strerror(results[i]));
}
}
So(fails == 0);
nng_shutdown(rep);
nng_thread_destroy(server);
})
})
})
})
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