mosquitto/lib/thread_mosq.c

/*
Copyright (c) 2011-2020 Roger Light <roger@atchoo.org>

All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
and Eclipse Distribution License v1.0 which accompany this distribution.

The Eclipse Public License is available at
   https://www.eclipse.org/legal/epl-2.0/
and the Eclipse Distribution License is available at
  http://www.eclipse.org/org/documents/edl-v10.php.

SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause

Contributors:
   Roger Light - initial implementation and documentation.
*/

#include "config.h"

#ifndef WIN32
#include <time.h>
#endif

#if defined(WITH_THREADING)
#if defined(__linux__) || defined(__NetBSD__)
#  include <pthread.h>
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
#  include <pthread_np.h>
#endif
#endif

#include "mosquitto_internal.h"
#include "net_mosq.h"
#include "util_mosq.h"

void *mosquitto__thread_main(void *obj);

int mosquitto_loop_start(struct mosquitto *mosq)
{
#if defined(WITH_THREADING)
	if(!mosq || mosq->threaded != mosq_ts_none) return MOSQ_ERR_INVAL;

	mosq->threaded = mosq_ts_self;
	if(!pthread_create(&mosq->thread_id, NULL, mosquitto__thread_main, mosq)){
#if defined(__linux__)
		pthread_setname_np(mosq->thread_id, "mosquitto loop");
#elif defined(__NetBSD__)
		pthread_setname_np(mosq->thread_id, "%s", "mosquitto loop");
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
		pthread_set_name_np(mosq->thread_id, "mosquitto loop");
#endif
		return MOSQ_ERR_SUCCESS;
	}else{
		return MOSQ_ERR_ERRNO;
	}
#else
	UNUSED(mosq);
	return MOSQ_ERR_NOT_SUPPORTED;
#endif
}

int mosquitto_loop_stop(struct mosquitto *mosq, bool force)
{
#if defined(WITH_THREADING)
#  ifndef WITH_BROKER
	char sockpair_data = 0;
#  endif

	if(!mosq || mosq->threaded != mosq_ts_self) return MOSQ_ERR_INVAL;


	/* Write a single byte to sockpairW (connected to sockpairR) to break out
	 * of select() if in threaded mode. */
	if(mosq->sockpairW != INVALID_SOCKET){
#ifndef WIN32
		if(write(mosq->sockpairW, &sockpair_data, 1)){
		}
#else
		send(mosq->sockpairW, &sockpair_data, 1, 0);
#endif
	}

#ifdef HAVE_PTHREAD_CANCEL
	if(force){
		pthread_cancel(mosq->thread_id);
	}
#endif
	pthread_join(mosq->thread_id, NULL);
	mosq->thread_id = pthread_self();
	mosq->threaded = mosq_ts_none;

	return MOSQ_ERR_SUCCESS;
#else
	UNUSED(mosq);
	UNUSED(force);
	return MOSQ_ERR_NOT_SUPPORTED;
#endif
}

#ifdef WITH_THREADING
void *mosquitto__thread_main(void *obj)
{
	struct mosquitto *mosq = obj;
#ifndef WIN32
	struct timespec ts;
	ts.tv_sec = 0;
	ts.tv_nsec = 10000000;
#endif

	if(!mosq) return NULL;

	do{
		if(mosquitto__get_state(mosq) == mosq_cs_new){
#ifdef WIN32
			Sleep(10);
#else
			nanosleep(&ts, NULL);
#endif
		}else{
			break;
		}
	}while(1);

	if(!mosq->keepalive){
		/* Sleep for a day if keepalive disabled. */
		mosquitto_loop_forever(mosq, 1000*86400, 1);
	}else{
		/* Sleep for our keepalive value. publish() etc. will wake us up. */
		mosquitto_loop_forever(mosq, mosq->keepalive*1000, 1);
	}
	if(mosq->threaded == mosq_ts_self){
		mosq->threaded = mosq_ts_none;
	}

	return obj;
}
#endif

int mosquitto_threaded_set(struct mosquitto *mosq, bool threaded)
{
	if(!mosq) return MOSQ_ERR_INVAL;

	if(threaded){
		mosq->threaded = mosq_ts_external;
	}else{
		mosq->threaded = mosq_ts_none;
	}

	return MOSQ_ERR_SUCCESS;
}