cpuminer/cpu-miner.c

/*
 * Copyright 2010 Jeff Garzik
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.  See COPYING for more details.
 */

#include "cpuminer-config.h"
#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#if defined(WIN32) || defined(WIN64)
#include <windows.h>
#else
#include <sys/resource.h>
#include <sys/sysctl.h>
#endif
#include <getopt.h>
#include <jansson.h>
#include <curl/curl.h>
#include "compat.h"
#include "miner.h"

#define PROGRAM_NAME		"minerd"
#define DEF_RPC_URL		"http://127.0.0.1:9332/"
#define LP_SCANTIME		60

#ifdef __linux /* Linux specific policy and affinity management */
#include <sched.h>
static inline void drop_policy(void)
{
	struct sched_param param;

#ifdef SCHED_IDLE
	if (unlikely(sched_setscheduler(0, SCHED_IDLE, &param) == -1))
#endif
#ifdef SCHED_BATCH
		sched_setscheduler(0, SCHED_BATCH, &param);
#endif
}

static inline void affine_to_cpu(int id, int cpu)
{
	cpu_set_t set;

	CPU_ZERO(&set);
	CPU_SET(cpu, &set);
	sched_setaffinity(0, sizeof(&set), &set);
	applog(LOG_INFO, "Binding thread %d to cpu %d", id, cpu);
}
#else
static inline void drop_policy(void)
{
}

static inline void affine_to_cpu(int id, int cpu)
{
}
#endif
		
enum workio_commands {
	WC_GET_WORK,
	WC_SUBMIT_WORK,
};

struct workio_cmd {
	enum workio_commands	cmd;
	struct thr_info		*thr;
	union {
		struct work	*work;
	} u;
};

enum sha256_algos {
	ALGO_SCRYPT,		/* scrypt(1024,1,1) */
};

static const char *algo_names[] = {
	[ALGO_SCRYPT]		= "scrypt",
};

bool opt_debug = false;
bool opt_protocol = false;
bool want_longpoll = true;
bool have_longpoll = false;
bool use_syslog = false;
static bool opt_quiet = false;
static int opt_retries = -1;
static int opt_fail_pause = 30;
int opt_timeout = 180;
int opt_scantime = 5;
static json_t *opt_config;
static const bool opt_time = true;
static enum sha256_algos opt_algo = ALGO_SCRYPT;
static int opt_n_threads;
static int num_processors;
static char *rpc_url;
static char *rpc_userpass;
static char *rpc_user, *rpc_pass;
struct thr_info *thr_info;
static int work_thr_id;
int longpoll_thr_id;
struct work_restart *work_restart = NULL;
pthread_mutex_t time_lock;
pthread_mutex_t stats_lock;

static unsigned long accepted_count = 0L;
static unsigned long rejected_count = 0L;
double *thr_hashrates;

static char const usage[] = "\
Usage: " PROGRAM_NAME " [OPTIONS]\n\
Options:\n\
  -o, --url=URL         URL of mining server (default: " DEF_RPC_URL ")\n\
  -O, --userpass=U:P    username:password pair for mining server\n\
  -u, --user=USERNAME   username for mining server\n\
  -p, --pass=PASSWORD   password for mining server\n\
  -t, --threads=N       number of miner threads (default: number of processors)\n\
  -r, --retries=N       number of times to retry if a network call fails\n\
                          (default: retry indefinitely)\n\
  -R, --retry-pause=N   time to pause between retries, in seconds (default: 30)\n\
  -T, --timeout=N       network timeout, in seconds (default: 180)\n\
  -s, --scantime=N      upper bound on time spent scanning current work,\n\
                          in seconds (default: 5)\n\
      --no-longpoll     disable X-Long-Polling support\n\
  -q, --quiet           disable per-thread hashmeter output\n\
  -D, --debug           enable debug output\n\
  -P, --protocol-dump   verbose dump of protocol-level activities\n"
#ifdef HAVE_SYSLOG_H
"\
      --syslog          use system log for output messages\n"
#endif
"\
  -c, --config=FILE     load a JSON-format configuration file\n\
  -V, --version         display version information and exit\n\
  -h, --help            display this help text and exit\n\
";

static char const short_options[] = "a:c:Dhp:Pqr:R:s:t:T:o:u:O:V";

static struct option const options[] = {
	{ "algo", 1, NULL, 'a' },
	{ "config", 1, NULL, 'c' },
	{ "debug", 0, NULL, 'D' },
	{ "help", 0, NULL, 'h' },
	{ "no-longpoll", 0, NULL, 1003 },
	{ "pass", 1, NULL, 'p' },
	{ "protocol-dump", 0, NULL, 'P' },
	{ "quiet", 0, NULL, 'q' },
	{ "retries", 1, NULL, 'r' },
	{ "retry-pause", 1, NULL, 'R' },
	{ "scantime", 1, NULL, 's' },
#ifdef HAVE_SYSLOG_H
	{ "syslog", 0, NULL, 1004 },
#endif
	{ "threads", 1, NULL, 't' },
	{ "timeout", 1, NULL, 'T' },
	{ "url", 1, NULL, 'o' },
	{ "user", 1, NULL, 'u' },
	{ "userpass", 1, NULL, 'O' },
	{ "version", 0, NULL, 'V' },

	{ }
};

struct work {
	unsigned char	data[128];
	unsigned char	target[32];

	unsigned char	hash[32];
};

static struct work g_work;
static time_t g_work_time;
static pthread_mutex_t g_work_lock;

static bool jobj_binary(const json_t *obj, const char *key,
			void *buf, size_t buflen)
{
	const char *hexstr;
	json_t *tmp;

	tmp = json_object_get(obj, key);
	if (unlikely(!tmp)) {
		applog(LOG_ERR, "JSON key '%s' not found", key);
		return false;
	}
	hexstr = json_string_value(tmp);
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "JSON key '%s' is not a string", key);
		return false;
	}
	if (!hex2bin(buf, hexstr, buflen))
		return false;

	return true;
}

static bool work_decode(const json_t *val, struct work *work)
{
	if (unlikely(!jobj_binary(val, "data", work->data, sizeof(work->data)))) {
		applog(LOG_ERR, "JSON inval data");
		goto err_out;
	}
	if (unlikely(!jobj_binary(val, "target", work->target, sizeof(work->target)))) {
		applog(LOG_ERR, "JSON inval target");
		goto err_out;
	}

	memset(work->hash, 0, sizeof(work->hash));

	return true;

err_out:
	return false;
}

static bool submit_upstream_work(CURL *curl, const struct work *work)
{
	char *hexstr = NULL;
	json_t *val, *res;
	char s[345];
	double hashrate;
	int i;
	bool rc = false;

	/* build hex string */
	hexstr = bin2hex(work->data, sizeof(work->data));
	if (unlikely(!hexstr)) {
		applog(LOG_ERR, "submit_upstream_work OOM");
		goto out;
	}

	/* build JSON-RPC request */
	sprintf(s,
	      "{\"method\": \"getwork\", \"params\": [ \"%s\" ], \"id\":1}\r\n",
		hexstr);

	/* issue JSON-RPC request */
	val = json_rpc_call(curl, rpc_url, rpc_userpass, s, false, false, NULL);
	if (unlikely(!val)) {
		applog(LOG_ERR, "submit_upstream_work json_rpc_call failed");
		goto out;
	}

	res = json_object_get(val, "result");
	
	hashrate = 0.;
	pthread_mutex_lock(&stats_lock);
	for (i = 0; i < opt_n_threads; i++)
		hashrate += thr_hashrates[i];
	json_is_true(res) ? accepted_count++ : rejected_count++;
	pthread_mutex_unlock(&stats_lock);
	
	applog(LOG_INFO, "accepted: %lu/%lu (%.2f%%), %.2f khash/s %s",
	       accepted_count,
	       accepted_count + rejected_count,
	       100. * accepted_count / (accepted_count + rejected_count),
	       1e-3 * hashrate,
	       json_is_true(res) ? "(yay!!!)" : "(booooo)");

	json_decref(val);

	rc = true;

out:
	free(hexstr);
	return rc;
}

static const char *rpc_req =
	"{\"method\": \"getwork\", \"params\": [], \"id\":0}\r\n";

static bool get_upstream_work(CURL *curl, struct work *work)
{
	json_t *val;
	bool rc;

	val = json_rpc_call(curl, rpc_url, rpc_userpass, rpc_req,
			    want_longpoll, false, NULL);
	if (!val)
		return false;

	rc = work_decode(json_object_get(val, "result"), work);

	json_decref(val);

	return rc;
}

static void workio_cmd_free(struct workio_cmd *wc)
{
	if (!wc)
		return;

	switch (wc->cmd) {
	case WC_SUBMIT_WORK:
		free(wc->u.work);
		break;
	default: /* do nothing */
		break;
	}

	memset(wc, 0, sizeof(*wc));	/* poison */
	free(wc);
}

static bool workio_get_work(struct workio_cmd *wc, CURL *curl)
{
	struct work *ret_work;
	int failures = 0;

	ret_work = calloc(1, sizeof(*ret_work));
	if (!ret_work)
		return false;

	/* obtain new work from bitcoin via JSON-RPC */
	while (!get_upstream_work(curl, ret_work)) {
		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "json_rpc_call failed, terminating workio thread");
			free(ret_work);
			return false;
		}

		/* pause, then restart work-request loop */
		applog(LOG_ERR, "json_rpc_call failed, retry after %d seconds",
			opt_fail_pause);
		sleep(opt_fail_pause);
	}

	/* send work to requesting thread */
	if (!tq_push(wc->thr->q, ret_work))
		free(ret_work);

	return true;
}

static bool workio_submit_work(struct workio_cmd *wc, CURL *curl)
{
	int failures = 0;

	/* submit solution to bitcoin via JSON-RPC */
	while (!submit_upstream_work(curl, wc->u.work)) {
		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
			applog(LOG_ERR, "...terminating workio thread");
			return false;
		}

		/* pause, then restart work-request loop */
		applog(LOG_ERR, "...retry after %d seconds",
			opt_fail_pause);
		sleep(opt_fail_pause);
	}

	return true;
}

static void *workio_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	CURL *curl;
	bool ok = true;

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialization failed");
		return NULL;
	}

	while (ok) {
		struct workio_cmd *wc;

		/* wait for workio_cmd sent to us, on our queue */
		wc = tq_pop(mythr->q, NULL);
		if (!wc) {
			ok = false;
			break;
		}

		/* process workio_cmd */
		switch (wc->cmd) {
		case WC_GET_WORK:
			ok = workio_get_work(wc, curl);
			break;
		case WC_SUBMIT_WORK:
			ok = workio_submit_work(wc, curl);
			break;

		default:		/* should never happen */
			ok = false;
			break;
		}

		workio_cmd_free(wc);
	}

	tq_freeze(mythr->q);
	curl_easy_cleanup(curl);

	return NULL;
}

static bool get_work(struct thr_info *thr, struct work *work)
{
	struct workio_cmd *wc;
	struct work *work_heap;

	/* fill out work request message */
	wc = calloc(1, sizeof(*wc));
	if (!wc)
		return false;

	wc->cmd = WC_GET_WORK;
	wc->thr = thr;

	/* send work request to workio thread */
	if (!tq_push(thr_info[work_thr_id].q, wc)) {
		workio_cmd_free(wc);
		return false;
	}

	/* wait for response, a unit of work */
	work_heap = tq_pop(thr->q, NULL);
	if (!work_heap)
		return false;

	/* copy returned work into storage provided by caller */
	memcpy(work, work_heap, sizeof(*work));
	free(work_heap);

	return true;
}

static bool submit_work(struct thr_info *thr, const struct work *work_in)
{
	struct workio_cmd *wc;

	/* fill out work request message */
	wc = calloc(1, sizeof(*wc));
	if (!wc)
		return false;

	wc->u.work = malloc(sizeof(*work_in));
	if (!wc->u.work)
		goto err_out;

	wc->cmd = WC_SUBMIT_WORK;
	wc->thr = thr;
	memcpy(wc->u.work, work_in, sizeof(*work_in));

	/* send solution to workio thread */
	if (!tq_push(thr_info[work_thr_id].q, wc))
		goto err_out;

	return true;

err_out:
	workio_cmd_free(wc);
	return false;
}

static void *miner_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	int thr_id = mythr->id;
	uint32_t max_nonce;
	uint32_t next_nonce;
	unsigned char *scratchbuf = NULL;

	/* Set worker threads to nice 19 and then preferentially to SCHED_IDLE
	 * and if that fails, then SCHED_BATCH. No need for this to be an
	 * error if it fails */
	setpriority(PRIO_PROCESS, 0, 19);
	drop_policy();

	/* Cpu affinity only makes sense if the number of threads is a multiple
	 * of the number of CPUs */
	if (!(opt_n_threads % num_processors))
		affine_to_cpu(mythr->id, mythr->id % num_processors);
	
	if (opt_algo == ALGO_SCRYPT)
	{
		scratchbuf = scrypt_buffer_alloc();
	}

	while (1) {
		struct work work __attribute__((aligned(128)));
		unsigned long hashes_done;
		struct timeval tv_start, tv_end, diff;
		int64_t max64;
		bool rc;

		/* obtain new work from internal workio thread */
		pthread_mutex_lock(&g_work_lock);
		if (!have_longpoll || time(NULL) >= g_work_time + LP_SCANTIME*3/4) {
			if (unlikely(!get_work(mythr, &g_work))) {
				applog(LOG_ERR, "work retrieval failed, exiting "
					"mining thread %d", mythr->id);
				pthread_mutex_unlock(&g_work_lock);
				goto out;
			}
			time(&g_work_time);
			if (opt_debug)
				applog(LOG_DEBUG, "DEBUG: got new work");
		}
		if (memcmp(work.data, g_work.data, 76)) {
			memcpy(&work, &g_work, sizeof(struct work));
			next_nonce = 0xffffffffU / opt_n_threads * thr_id;
		}
		pthread_mutex_unlock(&g_work_lock);
		work_restart[thr_id].restart = 0;
		
		/* adjust max_nonce to meet target scan time */
		max64 = g_work_time + (have_longpoll ? LP_SCANTIME : opt_scantime)
		      - time(NULL);
		max64 *= thr_hashrates[thr_id];
		if (max64 <= 0)
			max64 = 0xfffLL;
		if (next_nonce + max64 > 0xfffffffeLL)
			max_nonce = 0xfffffffeU;
		else
			max_nonce = next_nonce + max64;
		
		hashes_done = 0;
		gettimeofday(&tv_start, NULL);

		/* scan nonces for a proof-of-work hash */
		switch (opt_algo) {
		case ALGO_SCRYPT:
			rc = scanhash_scrypt(thr_id, work.data, scratchbuf, work.target,
			                     max_nonce, &next_nonce, &hashes_done);
			break;

		default:
			/* should never happen */
			goto out;
		}

		/* record scanhash elapsed time */
		gettimeofday(&tv_end, NULL);
		timeval_subtract(&diff, &tv_end, &tv_start);
		if (diff.tv_usec || diff.tv_sec) {
			pthread_mutex_lock(&stats_lock);
			thr_hashrates[thr_id] =
				hashes_done / (diff.tv_sec + 1e-6 * diff.tv_usec);
			pthread_mutex_unlock(&stats_lock);
		}
		if (!opt_quiet)
			applog(LOG_INFO, "thread %d: %lu hashes, %.2f khash/s",
				   thr_id, hashes_done, 1e-3 * thr_hashrates[thr_id]);

		/* if nonce found, submit work */
		if (rc && !submit_work(mythr, &work))
			break;
	}

out:
	tq_freeze(mythr->q);

	return NULL;
}

static void restart_threads(void)
{
	int i;

	for (i = 0; i < opt_n_threads; i++)
		work_restart[i].restart = 1;
}

static void *longpoll_thread(void *userdata)
{
	struct thr_info *mythr = userdata;
	CURL *curl = NULL;
	char *copy_start, *hdr_path, *lp_url = NULL;
	bool need_slash = false;
	int failures = 0;

	hdr_path = tq_pop(mythr->q, NULL);
	if (!hdr_path)
		goto out;

	/* full URL */
	if (strstr(hdr_path, "://")) {
		lp_url = hdr_path;
		hdr_path = NULL;
	}
	
	/* absolute path, on current server */
	else {
		copy_start = (*hdr_path == '/') ? (hdr_path + 1) : hdr_path;
		if (rpc_url[strlen(rpc_url) - 1] != '/')
			need_slash = true;

		lp_url = malloc(strlen(rpc_url) + strlen(copy_start) + 2);
		if (!lp_url)
			goto out;

		sprintf(lp_url, "%s%s%s", rpc_url, need_slash ? "/" : "", copy_start);
	}

	applog(LOG_INFO, "Long-polling activated for %s", lp_url);

	curl = curl_easy_init();
	if (unlikely(!curl)) {
		applog(LOG_ERR, "CURL initialization failed");
		goto out;
	}

	while (1) {
		json_t *val;
		int err;

		val = json_rpc_call(curl, lp_url, rpc_userpass, rpc_req,
				    false, true, &err);
		if (likely(val)) {
			failures = 0;
			applog(LOG_INFO, "LONGPOLL detected new block");
			pthread_mutex_lock(&g_work_lock);
			if (work_decode(json_object_get(val, "result"), &g_work)) {
				if (opt_debug)
					applog(LOG_DEBUG, "DEBUG: got new work");
				time(&g_work_time);
				restart_threads();
			}
			pthread_mutex_unlock(&g_work_lock);
			json_decref(val);
		} else {
			pthread_mutex_lock(&g_work_lock);
			g_work_time -= LP_SCANTIME;
			pthread_mutex_unlock(&g_work_lock);
			restart_threads();
			if (err != CURLE_OPERATION_TIMEDOUT) {
				sleep(opt_fail_pause);
			}
		}
	}

out:
	free(hdr_path);
	free(lp_url);
	tq_freeze(mythr->q);
	if (curl)
		curl_easy_cleanup(curl);

	return NULL;
}

static void show_version_and_exit(void)
{
	printf("%s\n%s\n", PACKAGE_STRING, curl_version());
	exit(0);
}

static void show_usage_and_exit(int status)
{
	if (status)
		fprintf(stderr, "Try `" PROGRAM_NAME " --help' for more information.\n");
	else
		printf(usage);
	exit(status);
}

static void parse_arg (int key, char *arg)
{
	char *p;
	int v, i;

	switch(key) {
	case 'a':
		for (i = 0; i < ARRAY_SIZE(algo_names); i++) {
			if (algo_names[i] &&
			    !strcmp(arg, algo_names[i])) {
				opt_algo = i;
				break;
			}
		}
		if (i == ARRAY_SIZE(algo_names))
			show_usage_and_exit(1);
		break;
	case 'c': {
		json_error_t err;
		if (opt_config)
			json_decref(opt_config);
#if JANSSON_VERSION_HEX >= 0x020000
		opt_config = json_load_file(arg, 0, &err);
#else
		opt_config = json_load_file(arg, &err);
#endif
		if (!json_is_object(opt_config)) {
			applog(LOG_ERR, "JSON decode of %s failed", arg);
			exit(1);
		}
		break;
	}
	case 'q':
		opt_quiet = true;
		break;
	case 'D':
		opt_debug = true;
		break;
	case 'p':
		free(rpc_pass);
		rpc_pass = strdup(arg);
		break;
	case 'P':
		opt_protocol = true;
		break;
	case 'r':
		v = atoi(arg);
		if (v < -1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);

		opt_retries = v;
		break;
	case 'R':
		v = atoi(arg);
		if (v < 1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);

		opt_fail_pause = v;
		break;
	case 's':
		v = atoi(arg);
		if (v < 1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);

		opt_scantime = v;
		break;
	case 'T':
		v = atoi(arg);
		if (v < 1 || v > 99999)	/* sanity check */
			show_usage_and_exit(1);

		opt_timeout = v;
		break;
	case 't':
		v = atoi(arg);
		if (v < 1 || v > 9999)	/* sanity check */
			show_usage_and_exit(1);

		opt_n_threads = v;
		break;
	case 'u':
		free(rpc_user);
		rpc_user = strdup(arg);
		break;
	case 'o':			/* --url */
		if (strncmp(arg, "http://", 7) &&
		    strncmp(arg, "https://", 8))
			show_usage_and_exit(1);

		free(rpc_url);
		rpc_url = strdup(arg);
		p = strchr(rpc_url, '@');
		if (p) {
			char *ap = strstr(rpc_url, "//") + 2;
			*p = '\0';
			if (!strchr(ap, ':'))
				show_usage_and_exit(1);
			free(rpc_userpass);
			rpc_userpass = strdup(ap);
			strcpy(ap, p + 1);
		}
		break;
	case 'O':			/* --userpass */
		if (!strchr(arg, ':'))
			show_usage_and_exit(1);

		free(rpc_userpass);
		rpc_userpass = strdup(arg);
		break;
	case 1003:
		want_longpoll = false;
		break;
	case 1004:
		use_syslog = true;
		break;
	case 'V':
		show_version_and_exit();
	case 'h':
		show_usage_and_exit(0);
	default:
		show_usage_and_exit(1);
	}
}

static void parse_config(void)
{
	int i;
	json_t *val;

	if (!json_is_object(opt_config))
		return;

	for (i = 0; i < ARRAY_SIZE(options); i++) {
		if (!options[i].name)
			break;
		if (!strcmp(options[i].name, "config"))
			continue;

		val = json_object_get(opt_config, options[i].name);
		if (!val)
			continue;

		if (options[i].has_arg && json_is_string(val)) {
			char *s = strdup(json_string_value(val));
			if (!s)
				break;
			parse_arg(options[i].val, s);
			free(s);
		} else if (!options[i].has_arg && json_is_true(val))
			parse_arg(options[i].val, "");
		else
			applog(LOG_ERR, "JSON option %s invalid",
				options[i].name);
	}
}

static void parse_cmdline(int argc, char *argv[])
{
	int key;

	while (1) {
		key = getopt_long(argc, argv, short_options, options, NULL);
		if (key < 0)
			break;

		parse_arg(key, optarg);
	}
	if (optind < argc) {
		fprintf(stderr, "%s: unsupported non-option argument '%s'\n",
			argv[0], argv[optind]);
		show_usage_and_exit(1);
	}

	parse_config();
}

int main(int argc, char *argv[])
{
	struct thr_info *thr;
	int i;

	rpc_url = strdup(DEF_RPC_URL);

	/* parse command line */
	parse_cmdline(argc, argv);

	pthread_mutex_init(&time_lock, NULL);
	pthread_mutex_init(&stats_lock, NULL);
	pthread_mutex_init(&g_work_lock, NULL);

#if defined(WIN32) || defined(WIN64)
	SYSTEM_INFO sysinfo;
	GetSystemInfo(&sysinfo);
	num_processors = sysinfo.dwNumberOfProcessors;
#elif defined(_SC_NPROCESSORS_ONLN)
	num_processors = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(HW_NCPU)
	int req[] = { CTL_HW, HW_NCPU };
	size_t len = sizeof(num_processors);
	v = sysctl(req, 2, &num_processors, &len, NULL, 0);
#else
	num_processors = 1;
#endif
	if (num_processors < 1)
		num_processors = 1;
	if (!opt_n_threads)
		opt_n_threads = num_processors;

	if (!rpc_userpass) {
		if (!rpc_user || !rpc_pass) {
			applog(LOG_ERR, "No login credentials supplied");
			return 1;
		}
		rpc_userpass = malloc(strlen(rpc_user) + strlen(rpc_pass) + 2);
		if (!rpc_userpass)
			return 1;
		sprintf(rpc_userpass, "%s:%s", rpc_user, rpc_pass);
	}

#ifdef HAVE_SYSLOG_H
	if (use_syslog)
		openlog("cpuminer", LOG_PID, LOG_USER);
#endif

	work_restart = calloc(opt_n_threads, sizeof(*work_restart));
	if (!work_restart)
		return 1;

	thr_info = calloc(opt_n_threads + 2, sizeof(*thr));
	if (!thr_info)
		return 1;

	/* init workio thread info */
	work_thr_id = opt_n_threads;
	thr = &thr_info[work_thr_id];
	thr->id = work_thr_id;
	thr->q = tq_new();
	if (!thr->q)
		return 1;

	/* start work I/O thread */
	if (pthread_create(&thr->pth, NULL, workio_thread, thr)) {
		applog(LOG_ERR, "workio thread create failed");
		return 1;
	}

	/* init longpoll thread info */
	if (want_longpoll) {
		longpoll_thr_id = opt_n_threads + 1;
		thr = &thr_info[longpoll_thr_id];
		thr->id = longpoll_thr_id;
		thr->q = tq_new();
		if (!thr->q)
			return 1;

		/* start longpoll thread */
		if (unlikely(pthread_create(&thr->pth, NULL, longpoll_thread, thr))) {
			applog(LOG_ERR, "longpoll thread create failed");
			return 1;
		}
	} else
		longpoll_thr_id = -1;
	
	thr_hashrates = (double *) calloc(opt_n_threads, sizeof(double));

	/* start mining threads */
	for (i = 0; i < opt_n_threads; i++) {
		thr = &thr_info[i];

		thr->id = i;
		thr->q = tq_new();
		if (!thr->q)
			return 1;

		if (unlikely(pthread_create(&thr->pth, NULL, miner_thread, thr))) {
			applog(LOG_ERR, "thread %d create failed", i);
			return 1;
		}

		sleep(1);	/* don't pound RPC server all at once */
	}

	applog(LOG_INFO, "%d miner threads started, "
		"using '%s' algorithm.",
		opt_n_threads,
		algo_names[opt_algo]);

	/* main loop - simply wait for workio thread to exit */
	pthread_join(thr_info[work_thr_id].pth, NULL);

	applog(LOG_INFO, "workio thread dead, exiting.");

	return 0;
}