thodg/cgminer/main.c

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• Hash : fbcd2942
  Author :
  Date : 2011-07-10T14:02:23
  

  Really correct the staged count logic failure.

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• main.c

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  /*
   * Copyright 2011 Con Kolivas
   * 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 "config.h"
  
  #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>
  #include <math.h>
  #include <stdarg.h>
  #include <assert.h>
  #ifndef WIN32
  #include <sys/resource.h>
  #endif
  #include <ccan/opt/opt.h>
  #include <jansson.h>
  #include <curl/curl.h>
  #include "compat.h"
  #include "miner.h"
  #include "findnonce.h"
  #include "ocl.h"
  
  #define PROGRAM_NAME		"cgminer"
  #define DEF_RPC_URL		"http://127.0.0.1:8332/"
  #define DEF_RPC_USERNAME	"rpcuser"
  #define DEF_RPC_PASSWORD	"rpcpass"
  #define DEF_RPC_USERPASS	DEF_RPC_USERNAME ":" DEF_RPC_PASSWORD
  
  #ifdef __linux /* Linux specific policy and affinity management */
  #include <sched.h>
  static inline void drop_policy(void)
  {
  	struct sched_param param;
  
  #ifdef SCHED_BATCH
  #ifdef SCHED_IDLE
  	if (unlikely(sched_setscheduler(0, SCHED_IDLE, &param) == -1))
  #endif
  		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 cpu mining 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,
  	WC_DIE,
  };
  
  struct workio_cmd {
  	enum workio_commands	cmd;
  	struct thr_info		*thr;
  	union {
  		struct work	*work;
  	} u;
  };
  
  enum sha256_algos {
  	ALGO_C,			/* plain C */
  	ALGO_4WAY,		/* parallel SSE2 */
  	ALGO_VIA,		/* VIA padlock */
  	ALGO_CRYPTOPP,		/* Crypto++ (C) */
  	ALGO_CRYPTOPP_ASM32,	/* Crypto++ 32-bit assembly */
  	ALGO_SSE2_64,		/* SSE2 for x86_64 */
  };
  
  static const char *algo_names[] = {
  	[ALGO_C]		= "c",
  #ifdef WANT_SSE2_4WAY
  	[ALGO_4WAY]		= "4way",
  #endif
  #ifdef WANT_VIA_PADLOCK
  	[ALGO_VIA]		= "via",
  #endif
  	[ALGO_CRYPTOPP]		= "cryptopp",
  #ifdef WANT_CRYPTOPP_ASM32
  	[ALGO_CRYPTOPP_ASM32]	= "cryptopp_asm32",
  #endif
  #ifdef WANT_X8664_SSE2
  	[ALGO_SSE2_64]		= "sse2_64",
  #endif
  };
  
  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 = 5;
  static int opt_log_interval = 5;
  bool opt_log_output = false;
  static int opt_queue = 1;
  int opt_vectors;
  int opt_worksize;
  int opt_scantime = 60;
  static const bool opt_time = true;
  #ifdef WANT_X8664_SSE2
  static enum sha256_algos opt_algo = ALGO_SSE2_64;
  #else
  static enum sha256_algos opt_algo = ALGO_C;
  #endif
  static int nDevs;
  static int opt_g_threads = 2;
  static int gpu_threads;
  static bool forced_n_threads;
  static int opt_n_threads;
  static int num_processors;
  static int scan_intensity = 4;
  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;
  static int stage_thr_id;
  struct work_restart *work_restart = NULL;
  pthread_mutex_t time_lock;
  static pthread_mutex_t hash_lock;
  static pthread_mutex_t qd_lock;
  static pthread_mutex_t stgd_lock;
  static double total_mhashes_done;
  static struct timeval total_tv_start, total_tv_end;
  static int accepted, rejected;
  int hw_errors;
  static int total_queued, total_staged, lp_staged;
  static bool localgen = false;
  static unsigned int getwork_requested;
  static char current_block[37];
  static char longpoll_block[37];
  static char blank[37];
  
  static void applog_and_exit(const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	vapplog(LOG_ERR, fmt, ap);
  	va_end(ap);
  	exit(1);
  }
  
  /* FIXME: Use asprintf for better errors. */
  static char *set_algo(const char *arg, enum sha256_algos *algo)
  {
  	enum sha256_algos i;
  
  	for (i = 0; i < ARRAY_SIZE(algo_names); i++) {
  		if (algo_names[i] && !strcmp(arg, algo_names[i])) {
  			*algo = i;
  			return NULL;
  		}
  	}
  	return "Unknown algorithm";
  }
  
  static void show_algo(char buf[OPT_SHOW_LEN], const enum sha256_algos *algo)
  {
  	strncpy(buf, algo_names[*algo], OPT_SHOW_LEN);
  }
  
  static char *set_int_range(const char *arg, int *i, int min, int max)
  {
  	char *err = opt_set_intval(arg, i);
  	if (err)
  		return err;
  
  	if (*i < min || *i > max)
  		return "Value out of range";
  
  	return NULL;
  }
  
  static char *set_int_0_to_9999(const char *arg, int *i)
  {
  	return set_int_range(arg, i, 0, 9999);
  }
  
  static char *set_int_0_to_14(const char *arg, int *i)
  {
  	return set_int_range(arg, i, 0, 14);
  }
  
  static char *force_nthreads_int(const char *arg, int *i)
  {
  	forced_n_threads = true;
  	return set_int_range(arg, i, 0, 9999);
  }
  
  static char *set_int_0_to_10(const char *arg, int *i)
  {
  	return set_int_range(arg, i, 0, 10);
  }
  
  static char *set_int_1_to_10(const char *arg, int *i)
  {
  	return set_int_range(arg, i, 1, 10);
  }
  
  static char *set_url(const char *arg, char **p)
  {
  	opt_set_charp(arg, p);
  	if (strncmp(arg, "http://", 7) &&
  	    strncmp(arg, "https://", 8))
  		return "URL must start with http:// or https://";
  
  	return NULL;
  }
  
  static char *set_vector(const char *arg, int *i)
  {
  	char *err = opt_set_intval(arg, i);
  	if (err)
  		return err;
  
  	if (*i != 1 && *i != 2 && *i != 4)
  		return "Valid vectors are 1, 2 or 4";
  	return NULL;
  }
  
  static char *enable_debug(bool *flag)
  {
  	*flag = true;
  	/* Turn out verbose output, too. */
  	opt_log_output = true;
  	return NULL;
  }
  
  
  /* These options are available from config file or commandline */
  static struct opt_table opt_config_table[] = {
  	OPT_WITH_ARG("--algo|-a",
  		     set_algo, show_algo, &opt_algo,
  		     "Specify sha256 implementation:\n"
  		     "\tc\t\tLinux kernel sha256, implemented in C"
  #ifdef WANT_SSE2_4WAY
  		     "\n\t4way\t\ttcatm's 4-way SSE2 implementation"
  #endif
  #ifdef WANT_VIA_PADLOCK
  		     "\n\tvia\t\tVIA padlock implementation"
  #endif
  		     "\n\tcryptopp\tCrypto++ C/C++ implementation"
  #ifdef WANT_CRYPTOPP_ASM32
  		     "\n\tcryptopp_asm32\tCrypto++ 32-bit assembler implementation"
  #endif
  #ifdef WANT_X8664_SSE2
  		     "\n\tsse2_64\t\tSSE2 implementation for x86_64 machines"
  #endif
  		),
  	OPT_WITH_ARG("--cpu-threads|-t",
  		     force_nthreads_int, opt_show_intval, &opt_n_threads,
  		     "Number of miner CPU threads"),
  	OPT_WITHOUT_ARG("--debug|-D",
  		     enable_debug, &opt_debug,
  		     "Enable debug output"),
  #ifdef HAVE_OPENCL
  	OPT_WITH_ARG("--gpu-threads|-g",
  		     set_int_0_to_10, opt_show_intval, &opt_g_threads,
  		     "Number of threads per GPU (0 - 10)"),
  	OPT_WITH_ARG("--intensity|-I",
  		     set_int_0_to_14, opt_show_intval, &scan_intensity,
  		     "Intensity of GPU scanning (0 - 14)"),
  #endif
  	OPT_WITH_ARG("--log|-l",
  		     set_int_0_to_9999, opt_show_intval, &opt_log_interval,
  		     "Interval in seconds between log output"),
  	OPT_WITHOUT_ARG("--no-longpoll",
  			opt_set_invbool, &want_longpoll,
  			"Disable X-Long-Polling support"),
  	OPT_WITH_ARG("--pass|-p",
  		     opt_set_charp, NULL, &rpc_pass,
  		     "Password for bitcoin JSON-RPC server"),
  	OPT_WITHOUT_ARG("--protocol-dump|-P",
  			opt_set_bool, &opt_protocol,
  			"Verbose dump of protocol-level activities"),
  	OPT_WITH_ARG("--queue|-Q",
  		     set_int_1_to_10, opt_show_intval, &opt_queue,
  		     "Number of extra work items to queue (1 - 10)"),
  	OPT_WITHOUT_ARG("--quiet|-q",
  			opt_set_bool, &opt_quiet,
  			"Disable per-thread hashmeter output"),
  	OPT_WITH_ARG("--retries|-r",
  		     opt_set_intval, opt_show_intval, &opt_retries,
  		     "Number of times to retry before giving up, if JSON-RPC call fails (-1 means never)"),
  	OPT_WITH_ARG("--retry-pause|-R",
  		     set_int_0_to_9999, opt_show_intval, &opt_fail_pause,
  		     "Number of seconds to pause, between retries"),
  	OPT_WITH_ARG("--scan-time|-s",
  		     set_int_0_to_9999, opt_show_intval, &opt_scantime,
  		     "Upper bound on time spent scanning current work, in seconds"),
  #ifdef HAVE_SYSLOG_H
  	OPT_WITHOUT_ARG("--syslog",
  			opt_set_bool, &use_syslog,
  			"Use system log for output messages (default: standard error)"),
  #endif
  	OPT_WITH_ARG("--url|-o",
  		     set_url, opt_show_charp, &rpc_url,
  		     "URL for bitcoin JSON-RPC server"),
  	OPT_WITH_ARG("--user|-u",
  		     opt_set_charp, NULL, &rpc_user,
  		     "Username for bitcoin JSON-RPC server"),
  #ifdef HAVE_OPENCL
  	OPT_WITH_ARG("--vectors|-v",
  		     set_vector, NULL, &opt_vectors,
  		     "Override detected optimal vector width (1, 2 or 4)"),
  #endif
  	OPT_WITHOUT_ARG("--verbose",
  			opt_set_bool, &opt_log_output,
  			"Log verbose output to stderr as well as status output"),
  #ifdef HAVE_OPENCL
  	OPT_WITH_ARG("--worksize|-w",
  		     set_int_0_to_9999, opt_show_intval, &opt_worksize,
  		     "Override detected optimal worksize"),
  #endif
  	OPT_WITH_ARG("--userpass|-O",
  		     opt_set_charp, NULL, &rpc_userpass,
  		     "Username:Password pair for bitcoin JSON-RPC server"),
  	OPT_ENDTABLE
  };
  
  static char *parse_config(json_t *config)
  {
  	static char err_buf[200];
  	json_t *val;
  	struct opt_table *opt;
  
  	for (opt = opt_config_table; opt->type != OPT_END; opt++) {
  		char *p, *name;
  
  		/* We don't handle subtables. */
  		assert(!(opt->type & OPT_SUBTABLE));
  
  		/* Pull apart the option name(s). */
  		name = strdup(opt->names);
  		for (p = strtok(name, "|"); p; p = strtok(NULL, "|")) {
  			char *err;
  			/* Ignore short options. */
  			if (p[1] != '-')
  				continue;
  
  			val = json_object_get(config, p+2);
  			if (!val)
  				continue;
  
  			if ((opt->type & OPT_HASARG) && json_is_string(val)) {
  				err = opt->cb_arg(json_string_value(val),
  						  opt->u.arg);
  			} else if ((opt->type&OPT_NOARG) && json_is_true(val)) {
  				err = opt->cb(opt->u.arg);
  			} else {
  				err = "Invalid value";
  			}
  			if (err) {
  				sprintf(err_buf, "Parsing JSON option %s: %s",
  					p, err);
  				return err_buf;
  			}
  		}
  		free(name);
  	}
  	return NULL;
  }
  
  static char *load_config(const char *arg, void *unused)
  {
  	json_error_t err;
  	json_t *config;
  
  	config = json_load_file(arg, &err);
  	if (!json_is_object(config))
  		return "JSON decode of file failed";
  
  	/* Parse the config now, so we can override it.  That can keep pointers
  	 * so don't free config object. */
  	return parse_config(config);
  }
  
  static char *print_ndevs_and_exit(int *ndevs)
  {
  	printf("%i", *ndevs);
  	exit(*ndevs);
  }
  
  /* These options are available from commandline only */
  static struct opt_table opt_cmdline_table[] = {
  	OPT_WITH_ARG("--config|-c",
  		     load_config, NULL, NULL,
  		     "Load a JSON-format configuration file\n"
  		     "See example-cfg.json for an example configuration."),
  	OPT_WITHOUT_ARG("--help|-h",
  			opt_usage_and_exit,
  #ifdef HAVE_OPENCL
  			"\nBuilt with CPU and GPU mining support.\n\n",
  #else
  			"\nBuilt with CPU mining support only.\n\n",
  #endif
  			"Print this message"),
  	OPT_WITHOUT_ARG("--ndevs|-n",
  			print_ndevs_and_exit, &nDevs,
  			"Display number of detected GPUs and exit"),
  	OPT_ENDTABLE
  };
  
  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, "midstate",
  			 work->midstate, sizeof(work->midstate)))) {
  		applog(LOG_ERR, "JSON inval midstate");
  		goto err_out;
  	}
  
  	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, "hash1", work->hash1, sizeof(work->hash1)))) {
  		applog(LOG_ERR, "JSON inval hash1");
  		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 double total_secs;
  static char statusline[256];
  
  static inline void print_status(void)
  {
  	printf("%s\r", statusline);
  	fflush(stdout);
  }
  
  static bool submit_fail = false;
  
  static bool submit_upstream_work(const struct work *work)
  {
  	char *hexstr = NULL;
  	json_t *val, *res;
  	char s[345];
  	bool rc = false;
  	struct cgpu_info *cgpu = thr_info[work->thr_id].cgpu;
  	CURL *curl = curl_easy_init();
  	double utility, efficiency;
  
  	if (unlikely(!curl)) {
  		applog(LOG_ERR, "CURL initialisation failed");
  		return rc;
  	}
  
  	/* build hex string */
  	hexstr = bin2hex(work->data, sizeof(work->data));
  	if (unlikely(!hexstr)) {
  		applog(LOG_ERR, "submit_upstream_work OOM");
  		goto out_nofree;
  	}
  
  	/* build JSON-RPC request */
  	sprintf(s,
  	      "{\"method\": \"getwork\", \"params\": [ \"%s\" ], \"id\":1}\r\n",
  		hexstr);
  
  	if (opt_debug)
  		applog(LOG_DEBUG, "DBG: sending RPC call: %s", s);
  
  	/* issue JSON-RPC request */
  	val = json_rpc_call(curl, rpc_url, rpc_userpass, s, false, false);
  	if (unlikely(!val)) {
  		applog(LOG_INFO, "submit_upstream_work json_rpc_call failed");
  		if (!submit_fail) {
  			submit_fail = true;
  			applog(LOG_WARNING, "Upstream communication failure, caching submissions");
  		}
  		goto out;
  	} else if (submit_fail) {
  		submit_fail = false;
  		applog(LOG_WARNING, "Upstream communication resumed, submitting work");
  	}
  
  	res = json_object_get(val, "result");
  
  	/* Theoretically threads could race when modifying accepted and
  	 * rejected values but the chance of two submits completing at the
  	 * same time is zero so there is no point adding extra locking */
  	if (json_is_true(res)) {
  		cgpu->accepted++;
  		accepted++;
  		if (opt_debug)
  			applog(LOG_DEBUG, "PROOF OF WORK RESULT: true (yay!!!)");
  		if (!opt_quiet)
  			printf("[Accepted] ");
  	} else {
  		cgpu->rejected++;
  		rejected++;
  		if (opt_debug)
  			applog(LOG_DEBUG, "PROOF OF WORK RESULT: false (booooo)");
  		if (!opt_quiet)
  			printf("[Rejected] ");
  	}
  
  	utility = cgpu->accepted / ( total_secs ? total_secs : 1 ) * 60;
  	efficiency = cgpu->getworks ? cgpu->accepted * 100.0 / cgpu->getworks : 0.0;
  
  	if (!opt_quiet) {
  		printf("[%sPU %d] [%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]                 \n",
  			cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, cgpu->total_mhashes / total_secs,
  			cgpu->getworks, cgpu->accepted, cgpu->rejected, cgpu->hw_errors,
  			efficiency, utility);
  		print_status();
  	}
  	applog(LOG_INFO, "%sPU %d  Requested:%d  Accepted:%d  Rejected:%d  HW errors:%d  Efficiency:%.0f%%  Utility:%.2f/m",
  	       cgpu->is_gpu? "G" : "C", cgpu->cpu_gpu, cgpu->getworks, cgpu->accepted, cgpu->rejected, cgpu->hw_errors, efficiency, utility
             );
  
  	json_decref(val);
  
  	rc = true;
  out:
  	free(hexstr);
  out_nofree:
  	curl_easy_cleanup(curl);
  	return rc;
  }
  
  static const char *rpc_req =
  	"{\"method\": \"getwork\", \"params\": [], \"id\":0}\r\n";
  
  static bool get_upstream_work(struct work *work)
  {
  	json_t *val;
  	bool rc = false;
  	CURL *curl = curl_easy_init();
  
  	if (unlikely(!curl)) {
  		applog(LOG_ERR, "CURL initialisation failed");
  		return rc;
  	}
  
  	val = json_rpc_call(curl, rpc_url, rpc_userpass, rpc_req,
  			    want_longpoll, false);
  	if (unlikely(!val)) {
  		applog(LOG_DEBUG, "Failed json_rpc_call in get_upstream_work");
  		goto out;
  	}
  
  	rc = work_decode(json_object_get(val, "result"), work);
  
  	json_decref(val);
  out:
  	curl_easy_cleanup(curl);
  
  	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 void kill_work(void)
  {
  	struct workio_cmd *wc;
  
  	applog(LOG_INFO, "Received kill message");
  	wc = calloc(1, sizeof(*wc));
  	if (unlikely(!wc)) {
  		applog(LOG_ERR, "Failed to calloc wc in kill_work");
  		/* We're just trying to die anyway, so forget graceful */
  		exit (1);
  	}
  
  	wc->cmd = WC_DIE;
  	wc->thr = 0;
  
  	if (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
  		applog(LOG_ERR, "Failed to tq_push work in kill_work");
  		exit (1);
  	}
  }
  
  static void *get_work_thread(void *userdata)
  {
  	struct workio_cmd *wc = (struct workio_cmd *)userdata;
  	struct work *ret_work;
  	int failures = 0;
  
  	pthread_detach(pthread_self());
  	ret_work = calloc(1, sizeof(*ret_work));
  	if (unlikely(!ret_work)) {
  		applog(LOG_ERR, "Failed to calloc ret_work in workio_get_work");
  		kill_work();
  		goto out;
  	}
  
  	/* obtain new work from bitcoin via JSON-RPC */
  	while (!get_upstream_work(ret_work)) {
  		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
  			applog(LOG_ERR, "json_rpc_call failed, terminating workio thread");
  			free(ret_work);
  			kill_work();
  			goto out;
  		}
  
  		/* pause, then restart work-request loop */
  		applog(LOG_DEBUG, "json_rpc_call failed on get work, retry after %d seconds",
  			opt_fail_pause);
  		sleep(opt_fail_pause);
  	}
  
  	/* send work to requesting thread */
  	if (unlikely(!tq_push(thr_info[stage_thr_id].q, ret_work))) {
  		applog(LOG_ERR, "Failed to tq_push work in workio_get_work");
  		kill_work();
  		free(ret_work);
  	}
  
  out:
  	workio_cmd_free(wc);
  	return NULL;
  }
  
  static bool workio_get_work(struct workio_cmd *wc)
  {
  	pthread_t get_thread;
  
  	if (unlikely(pthread_create(&get_thread, NULL, get_work_thread, (void *)wc))) {
  		applog(LOG_ERR, "Failed to create get_work_thread");
  		return false;
  	}
  	return true;
  }
  
  static void *submit_work_thread(void *userdata)
  {
  	struct workio_cmd *wc = (struct workio_cmd *)userdata;
  	int failures = 0;
  	char *hexstr;
  
  	pthread_detach(pthread_self());
  
  	hexstr = bin2hex(wc->u.work->data, 36);
  	if (unlikely(!hexstr)) {
  		applog(LOG_ERR, "submit_work_thread OOM");
  		goto out;
  	}
  	if (unlikely(strncmp(hexstr, current_block, 36))) {
  		applog(LOG_WARNING, "Stale work detected, discarding");
  		goto out_free;
  	}
  
  	/* submit solution to bitcoin via JSON-RPC */
  	while (!submit_upstream_work(wc->u.work)) {
  		if (unlikely(strncmp(hexstr, current_block, 36))) {
  			applog(LOG_WARNING, "Stale work detected, discarding");
  			goto out_free;
  		}
  		if (unlikely((opt_retries >= 0) && (++failures > opt_retries))) {
  			applog(LOG_ERR, "Failed %d retries ...terminating workio thread", opt_retries);
  			kill_work();
  			goto out_free;
  		}
  
  		/* pause, then restart work-request loop */
  		applog(LOG_INFO, "json_rpc_call failed on submit_work, retry after %d seconds",
  			opt_fail_pause);
  		sleep(opt_fail_pause);
  	}
  out_free:
  	free(hexstr);
  out:
  	workio_cmd_free(wc);
  	return NULL;
  }
  
  static bool workio_submit_work(struct workio_cmd *wc)
  {
  	pthread_t submit_thread;
  
  	if (unlikely(pthread_create(&submit_thread, NULL, submit_work_thread, (void *)wc))) {
  		applog(LOG_ERR, "Failed to create submit_work_thread");
  		return false;
  	}
  	return true;
  }
  
  static void inc_staged(int inc, bool lp)
  {
  	pthread_mutex_lock(&stgd_lock);
  	if (lp) {
  		lp_staged += inc;
  		total_staged += inc;
  	} else if (lp_staged)
  		lp_staged--;
  	else
  		total_staged += inc;
  	pthread_mutex_unlock(&stgd_lock);
  }
  
  static void dec_staged(int inc)
  {
  	pthread_mutex_lock(&stgd_lock);
  	if (lp_staged)
  		lp_staged -= inc;
  	total_staged -= inc;
  	pthread_mutex_unlock(&stgd_lock);
  }
  
  static int requests_staged(void)
  {
  	int ret;
  
  	pthread_mutex_lock(&stgd_lock);
  	ret = total_staged;
  	pthread_mutex_unlock(&stgd_lock);
  	return ret;
  }
  
  static void *stage_thread(void *userdata)
  {
  	struct thr_info *mythr = userdata;
  	bool ok = true;
  	unsigned int i;
  
  	for (i = 0; i < 36; i++) {
  		strcat(current_block, "0");
  		strcat(blank, "0");
  	}
  
  	while (ok) {
  		struct work *work = NULL;
  		char *hexstr;
  
  		work = tq_pop(mythr->q, NULL);
  		if (unlikely(!work)) {
  			applog(LOG_ERR, "Failed to tq_pop in stage_thread");
  			ok = false;
  			break;
  		}
  
  		hexstr = bin2hex(work->data, 36);
  		if (unlikely(!hexstr)) {
  			applog(LOG_ERR, "stage_thread OOM");
  			break;
  		}
  
  		/* current_block is blanked out on successful longpoll */
  		if (likely(strncmp(current_block, blank, 36))) {
  			if (unlikely(strncmp(hexstr, current_block, 36))) {
  				if (want_longpoll)
  					applog(LOG_WARNING, "New block detected, possible missed longpoll, flushing work queue");
  				else
  					applog(LOG_WARNING, "New block detected, flushing work queue");
  				/* As we can't flush the work from here, signal
  				 * the wakeup thread to restart all the
  				 * threads */
  				work_restart[stage_thr_id].restart = 1;
  			}
  		} else
  			memcpy(longpoll_block, hexstr, 36);
  		memcpy(current_block, hexstr, 36);
  		free(hexstr);
  
  		if (unlikely(!tq_push(thr_info[0].q, work))) {
  			applog(LOG_ERR, "Failed to tq_push work in stage_thread");
  			ok = false;
  			break;
  		}
  		inc_staged(1, false);
  	}
  
  	tq_freeze(mythr->q);
  	return NULL;
  }
  
  static void *workio_thread(void *userdata)
  {
  	struct thr_info *mythr = userdata;
  	bool ok = true;
  
  	while (ok) {
  		struct workio_cmd *wc;
  
  		/* wait for workio_cmd sent to us, on our queue */
  		wc = tq_pop(mythr->q, NULL);
  		if (unlikely(!wc)) {
  			applog(LOG_ERR, "Failed to tq_pop in workio_thread");
  			ok = false;
  			break;
  		}
  
  		/* process workio_cmd */
  		switch (wc->cmd) {
  		case WC_GET_WORK:
  			ok = workio_get_work(wc);
  			break;
  		case WC_SUBMIT_WORK:
  			ok = workio_submit_work(wc);
  			break;
  		case WC_DIE:
  		default:
  			ok = false;
  			break;
  		}
  	}
  
  	tq_freeze(mythr->q);
  
  	return NULL;
  }
  
  static void hashmeter(int thr_id, struct timeval *diff,
  		      unsigned long hashes_done)
  {
  	struct timeval temp_tv_end, total_diff;
  	double khashes, secs;
  	double local_secs;
  	double utility, efficiency = 0.0;
  	static double local_mhashes_done = 0;
  	static double rolling_local = 0;
  	double local_mhashes = (double)hashes_done / 1000000.0;
  
  	/* Don't bother calculating anything if we're not displaying it */
  	if (opt_quiet || !opt_log_interval)
  		return;
  	
  	khashes = hashes_done / 1000.0;
  	secs = (double)diff->tv_sec + ((double)diff->tv_usec / 1000000.0);
  
  	if (thr_id >= 0) {
  		/* So we can call hashmeter from a non worker thread */
  		struct cgpu_info *cgpu = thr_info[thr_id].cgpu;
  
  		if (opt_debug)
  			applog(LOG_DEBUG, "[thread %d: %lu hashes, %.0f khash/sec]",
  				thr_id, hashes_done, hashes_done / secs);
  		cgpu->local_mhashes += local_mhashes;
  		cgpu->total_mhashes += local_mhashes;
  	}
  
  	/* Totals are updated by all threads so can race without locking */
  	pthread_mutex_lock(&hash_lock);
  	gettimeofday(&temp_tv_end, NULL);
  	timeval_subtract(&total_diff, &temp_tv_end, &total_tv_end);
  	local_secs = (double)total_diff.tv_sec + ((double)total_diff.tv_usec / 1000000.0);
  
  	total_mhashes_done += local_mhashes;
  	local_mhashes_done += local_mhashes;
  	if (total_diff.tv_sec < opt_log_interval)
  		/* Only update the total every opt_log_interval seconds */
  		goto out_unlock;
  	gettimeofday(&total_tv_end, NULL);
  
  	/* Use a rolling average by faking an exponential decay over 5 * log */
  	rolling_local = ((rolling_local * 0.9) + local_mhashes_done) / 1.9;
  
  	timeval_subtract(&total_diff, &total_tv_end, &total_tv_start);
  	total_secs = (double)total_diff.tv_sec +
  		((double)total_diff.tv_usec / 1000000.0);
  
  	utility = accepted / ( total_secs ? total_secs : 1 ) * 60;
  	efficiency = getwork_requested ? accepted * 100.0 / getwork_requested : 0.0;
  
  	sprintf(statusline, "[(%ds):%.1f  (avg):%.1f Mh/s] [Q:%d  A:%d  R:%d  HW:%d  E:%.0f%%  U:%.2f/m]          ",
  		opt_log_interval, rolling_local / local_secs, total_mhashes_done / total_secs,
  		getwork_requested, accepted, rejected, hw_errors, efficiency, utility);
  	print_status();
  	applog(LOG_INFO, "[Rate (%ds):%.1f  (avg):%.2f Mhash/s] [Requested:%d  Accepted:%d  Rejected:%d  HW errors:%d  Efficiency:%.0f%%  Utility:%.2f/m]",
  		opt_log_interval, rolling_local / local_secs, total_mhashes_done / total_secs,
  		getwork_requested, accepted, rejected, hw_errors, efficiency, utility);
  
  	local_mhashes_done = 0;
  out_unlock:
  	pthread_mutex_unlock(&hash_lock);
  }
  
  /* This is overkill, but at least we'll know accurately how much work is
   * queued to prevent ever being left without work */
  static void inc_queued(void)
  {
  	pthread_mutex_lock(&qd_lock);
  	total_queued++;
  	pthread_mutex_unlock(&qd_lock);
  }
  
  static void dec_queued(void)
  {
  	pthread_mutex_lock(&qd_lock);
  	total_queued--;
  	pthread_mutex_unlock(&qd_lock);
  	dec_staged(1);
  }
  
  static int requests_queued(void)
  {
  	int ret;
  
  	pthread_mutex_lock(&qd_lock);
  	ret = total_queued;
  	pthread_mutex_unlock(&qd_lock);
  	return ret;
  }
  
  /* All work is queued flagged as being for thread 0 and then the mining thread
   * flags it as its own */
  static bool queue_request(void)
  {
  	struct thr_info *thr = &thr_info[0];
  	struct workio_cmd *wc;
  
  	/* fill out work request message */
  	wc = calloc(1, sizeof(*wc));
  	if (unlikely(!wc)) {
  		applog(LOG_ERR, "Failed to tq_pop in queue_request");
  		return false;
  	}
  
  	wc->cmd = WC_GET_WORK;
  	wc->thr = thr;
  
  	/* send work request to workio thread */
  	if (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
  		applog(LOG_ERR, "Failed to tq_push in queue_request");
  		workio_cmd_free(wc);
  		return false;
  	}
  	inc_queued();
  	return true;
  }
  
  static bool discard_request(void)
  {
  	struct thr_info *thr = &thr_info[0];
  	struct work *work_heap;
  
  	/* Just in case we fell in a hole and missed a queue filling */
  	if (unlikely(!requests_queued())) {
  		applog(LOG_WARNING, "Tried to discard_request with nil queued");
  		return true;
  	}
  
  	work_heap = tq_pop(thr->q, NULL);
  	if (unlikely(!work_heap)) {
  		applog(LOG_ERR, "Failed to tq_pop in discard_request");
  		return false;
  	}
  	free(work_heap);
  	dec_queued();
  	return true;
  }
  
  static void flush_requests(bool longpoll)
  {
  	int i, extra;
  
  	extra = requests_queued();
  	/* When flushing from longpoll, we don't know the new work yet. When
  	 * not flushing from longpoll, the first work item is valid so do not
  	 * discard it */
  	if (longpoll)
  		memcpy(current_block, blank, 36);
  	else
  		extra--;
  
  	/* Temporarily increase the staged count so that get_work thinks there
  	 * is work available instead of making threads reuse existing work */
  	inc_staged(extra, true);
  
  	for (i = 0; i < extra; i++) {
  		/* Queue a whole batch of new requests */
  		if (unlikely(!queue_request())) {
  			applog(LOG_ERR, "Failed to queue requests in flush_requests");
  			kill_work();
  			break;
  		}
  		/* Pop off the old requests. Cancelling the requests would be better
  		* but is tricky */
  		if (unlikely(!discard_request())) {
  			applog(LOG_ERR, "Failed to discard requests in flush_requests");
  			kill_work();
  			break;
  		}
  	}
  }
  
  static bool get_work(struct work *work, bool queued)
  {
  	struct thr_info *thr = &thr_info[0];
  	struct work *work_heap;
  	bool ret = false;
  	int failures = 0;
  
  	getwork_requested++;
  
  retry:
  	if (unlikely(!queued && !queue_request())) {
  		applog(LOG_WARNING, "Failed to queue_request in get_work");
  		goto out;
  	}
  
  	if (!requests_staged()) {
  		uint32_t *work_ntime;
  		uint32_t ntime;
  
  		/* Only print this message once each time we shift to localgen */
  		if (!localgen)
  			applog(LOG_WARNING, "Server not providing work fast enough, generating work locally");
  		localgen = true;
  		work_ntime = (uint32_t *)(work->data + 68);
  		ntime = be32toh(*work_ntime);
  		ntime++;
  		*work_ntime = htobe32(ntime);
  		ret = true;
  		goto out;
  	} else if (localgen) {
  		localgen = false;
  		applog(LOG_WARNING, "Resumed retrieving work from server");
  	}
  
  	/* wait for 1st response, or get cached response */
  	work_heap = tq_pop(thr->q, NULL);
  	if (unlikely(!work_heap)) {
  		applog(LOG_WARNING, "Failed to tq_pop in get_work");
  		goto out;
  	}
  	dec_queued();
  
  	memcpy(work, work_heap, sizeof(*work));
  	
  	ret = true;
  	free(work_heap);
  out:
  	if (unlikely(ret == false)) {
  		if ((opt_retries >= 0) && (++failures > opt_retries)) {
  			applog(LOG_ERR, "Failed %d times to get_work");
  			return ret;
  		}
  		applog(LOG_DEBUG, "Retrying after %d seconds", opt_fail_pause);
  		sleep(opt_fail_pause);
  		goto retry;
  	}
  	return ret;
  }
  
  static bool submit_work_sync(struct thr_info *thr, const struct work *work_in)
  {
  	struct workio_cmd *wc;
  
  	/* fill out work request message */
  	wc = calloc(1, sizeof(*wc));
  	if (unlikely(!wc)) {
  		applog(LOG_ERR, "Failed to calloc wc in submit_work_sync");
  		return false;
  	}
  
  	wc->u.work = malloc(sizeof(*work_in));
  	if (unlikely(!wc->u.work)) {
  		applog(LOG_ERR, "Failed to calloc work in submit_work_sync");
  		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 (unlikely(!tq_push(thr_info[work_thr_id].q, wc))) {
  		applog(LOG_ERR, "Failed to tq_push work in submit_work_sync");
  		goto err_out;
  	}
  
  	return true;
  err_out:
  	workio_cmd_free(wc);
  	return false;
  }
  
  bool submit_nonce(struct thr_info *thr, struct work *work, uint32_t nonce)
  {
  	work->data[64+12+0] = (nonce>>0) & 0xff;
  	work->data[64+12+1] = (nonce>>8) & 0xff;
  	work->data[64+12+2] = (nonce>>16) & 0xff;
  	work->data[64+12+3] = (nonce>>24) & 0xff;
  	return submit_work_sync(thr, work);
  }
  
  static inline int cpu_from_thr_id(int thr_id)
  {
  	return (thr_id - gpu_threads) % num_processors;
  }
  
  static void *miner_thread(void *userdata)
  {
  	struct thr_info *mythr = userdata;
  	const int thr_id = mythr->id;
  	uint32_t max_nonce = 0xffffff;
  	bool needs_work = true;
  	/* Try to cycle approximately 5 times before each log update */
  	const unsigned long cycle = opt_log_interval / 5 ? : 1;
  	/* Request the next work item at 2/3 of the scantime */
  	unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
  	unsigned const long request_nonce = MAXTHREADS / 3 * 2;
  	bool requested = true;
  
  	/* 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(thr_id - gpu_threads, cpu_from_thr_id(thr_id));
  
  	while (1) {
  		struct work work __attribute__((aligned(128)));
  		unsigned long hashes_done;
  		struct timeval tv_workstart, tv_start, tv_end, diff;
  		uint64_t max64;
  		bool rc;
  
  		if (needs_work) {
  			gettimeofday(&tv_workstart, NULL);
  			/* obtain new work from internal workio thread */
  			if (unlikely(!get_work(&work, requested))) {
  				applog(LOG_ERR, "work retrieval failed, exiting "
  					"mining thread %d", thr_id);
  				goto out;
  			}
  			mythr->cgpu->getworks++;
  			work.thr_id = thr_id;
  			needs_work = requested = false;
  			work.blk.nonce = 0;
  		}
  		hashes_done = 0;
  		gettimeofday(&tv_start, NULL);
  
  		/* scan nonces for a proof-of-work hash */
  		switch (opt_algo) {
  		case ALGO_C:
  			rc = scanhash_c(thr_id, work.midstate, work.data + 64,
  				        work.hash1, work.hash, work.target,
  					max_nonce, &hashes_done,
  					work.blk.nonce);
  			break;
  
  #ifdef WANT_X8664_SSE2
  		case ALGO_SSE2_64: {
  			unsigned int rc5 =
  			        scanhash_sse2_64(thr_id, work.midstate, work.data + 64,
  						 work.hash1, work.hash,
  						 work.target,
  					         max_nonce, &hashes_done,
  						 work.blk.nonce);
  			rc = (rc5 == -1) ? false : true;
  			}
  			break;
  #endif
  
  #ifdef WANT_SSE2_4WAY
  		case ALGO_4WAY: {
  			unsigned int rc4 =
  				ScanHash_4WaySSE2(thr_id, work.midstate, work.data + 64,
  						  work.hash1, work.hash,
  						  work.target,
  						  max_nonce, &hashes_done,
  						  work.blk.nonce);
  			rc = (rc4 == -1) ? false : true;
  			}
  			break;
  #endif
  
  #ifdef WANT_VIA_PADLOCK
  		case ALGO_VIA:
  			rc = scanhash_via(thr_id, work.data, work.target,
  					  max_nonce, &hashes_done,
  					  work.blk.nonce);
  			break;
  #endif
  		case ALGO_CRYPTOPP:
  			rc = scanhash_cryptopp(thr_id, work.midstate, work.data + 64,
  				        work.hash1, work.hash, work.target,
  					max_nonce, &hashes_done,
  					work.blk.nonce);
  			break;
  
  #ifdef WANT_CRYPTOPP_ASM32
  		case ALGO_CRYPTOPP_ASM32:
  			rc = scanhash_asm32(thr_id, work.midstate, work.data + 64,
  				        work.hash1, work.hash, work.target,
  					max_nonce, &hashes_done,
  					work.blk.nonce);
  			break;
  #endif
  
  		default:
  			/* should never happen */
  			goto out;
  		}
  
  		/* record scanhash elapsed time */
  		gettimeofday(&tv_end, NULL);
  		timeval_subtract(&diff, &tv_end, &tv_start);
  
  		hashes_done -= work.blk.nonce;
  		hashmeter(thr_id, &diff, hashes_done);
  		work.blk.nonce += hashes_done;
  
  		/* adjust max_nonce to meet target cycle time */
  		if (diff.tv_usec > 500000)
  			diff.tv_sec++;
  		if (diff.tv_sec && diff.tv_sec != cycle) {
  			max64 = work.blk.nonce +
  				((uint64_t)hashes_done * cycle) / diff.tv_sec;
  		} else
  			max64 = work.blk.nonce + hashes_done;
  		if (max64 > 0xfffffffaULL)
  			max64 = 0xfffffffaULL;
  		max_nonce = max64;
  
  		/* if nonce found, submit work */
  		if (unlikely(rc)) {
  			if (opt_debug)
  				applog(LOG_DEBUG, "CPU %d found something?", cpu_from_thr_id(thr_id));
  			if (unlikely(!submit_work_sync(mythr, &work))) {
  				applog(LOG_ERR, "Failed to submit_work_sync in miner_thread %d", thr_id);
  				break;
  			}
  			work.blk.nonce += 4;
  		}
  
  		timeval_subtract(&diff, &tv_end, &tv_workstart);
  		if (!requested && (diff.tv_sec > request_interval || work.blk.nonce > request_nonce)) {
  			if (unlikely(!queue_request())) {
  				applog(LOG_ERR, "Failed to queue_request in miner_thread %d", thr_id);
  				goto out;
  			}
  			requested = true;
  		}
  
  		if (diff.tv_sec > opt_scantime || work_restart[thr_id].restart ||
  			work.blk.nonce >= MAXTHREADS - hashes_done)
  				needs_work = true;
  	}
  
  out:
  	tq_freeze(mythr->q);
  
  	return NULL;
  }
  
  enum {
  	STAT_SLEEP_INTERVAL		= 1,
  	STAT_CTR_INTERVAL		= 10000000,
  	FAILURE_INTERVAL		= 30,
  };
  
  #ifdef HAVE_OPENCL
  static _clState *clStates[16];
  
  static inline cl_int queue_kernel_parameters(_clState *clState, dev_blk_ctx *blk)
  {
  	cl_kernel *kernel = &clState->kernel;
  	cl_int status = 0;
  	int num = 0;
  
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_a);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_b);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_c);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_d);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_e);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_f);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_g);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->ctx_h);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_b);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_c);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_d);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_f);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_g);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->cty_h);
  	status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->nonce);
  
  	if (clState->hasBitAlign == true) {
  		/* Parameters for phatk kernel */
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W2);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W16);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->W17);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->PreVal4);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->T1);
  	} else {
  		/* Parameters for poclbm kernel */
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW0);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW1);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW2);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW3);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW15);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fW01r);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fcty_e);
  		status |= clSetKernelArg(*kernel, num++, sizeof(uint), (void *)&blk->fcty_e2);
  	}
  	status |= clSetKernelArg(*kernel, num++, sizeof(clState->outputBuffer),
  				 (void *)&clState->outputBuffer);
  
  	return status;
  }
  
  static inline int gpu_from_thr_id(int thr_id)
  {
  	return thr_id % nDevs;
  }
  
  static void *gpuminer_thread(void *userdata)
  {
  	const unsigned long cycle = opt_log_interval / 5 ? : 1;
  	struct timeval tv_start, tv_end, diff;
  	struct thr_info *mythr = userdata;
  	const int thr_id = mythr->id;
  	uint32_t *res, *blank_res;
  
  	size_t globalThreads[1];
  	size_t localThreads[1];
  
  	cl_int status;
  
  	_clState *clState = clStates[thr_id];
  	const cl_kernel *kernel = &clState->kernel;
  
  	struct work *work = malloc(sizeof(struct work));
  	unsigned const int threads = 1 << (15 + scan_intensity);
  	unsigned const int vectors = clState->preferred_vwidth;
  	unsigned const int hashes = threads * vectors;
  	unsigned int hashes_done = 0;
  
  	/* Request the next work item at 2/3 of the scantime */
  	unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
  	unsigned const long request_nonce = MAXTHREADS / 3 * 2;
  	bool requested = true;
  
  	res = calloc(BUFFERSIZE, 1);
  	blank_res = calloc(BUFFERSIZE, 1);
  
  	if (!res || !blank_res) {
  		applog(LOG_ERR, "Failed to calloc in gpuminer_thread");
  		goto out;
  	}
  
  	gettimeofday(&tv_start, NULL);
  	globalThreads[0] = threads;
  	localThreads[0] = clState->work_size;
  	diff.tv_sec = ~0UL;
  	gettimeofday(&tv_end, NULL);
  
  	while (1) {
  		struct timeval tv_workstart;
  
  		/* This finish flushes the readbuffer set with CL_FALSE later */
  		clFinish(clState->commandQueue);
  		if (diff.tv_sec > opt_scantime  || work->blk.nonce >= MAXTHREADS - hashes || work_restart[thr_id].restart) {
  			/* Ignore any reads since we're getting new work and queue a clean buffer */
  			status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
  					BUFFERSIZE, blank_res, 0, NULL, NULL);
  			if (unlikely(status != CL_SUCCESS))
  				{ applog(LOG_ERR, "Error: clEnqueueWriteBuffer failed."); goto out; }
  			memset(res, 0, BUFFERSIZE);
  
  			gettimeofday(&tv_workstart, NULL);
  			/* obtain new work from internal workio thread */
  			if (unlikely(!get_work(work, requested))) {
  				applog(LOG_ERR, "work retrieval failed, exiting "
  					"gpu mining thread %d", mythr->id);
  				goto out;
  			}
  			mythr->cgpu->getworks++;
  			work->thr_id = thr_id;
  			requested = false;
  
  			precalc_hash(&work->blk, (uint32_t *)(work->midstate), (uint32_t *)(work->data + 64));
  			work->blk.nonce = 0;
  			work_restart[thr_id].restart = 0;
  
  			if (opt_debug)
  				applog(LOG_DEBUG, "getwork thread %d", thr_id);
  			/* Flushes the writebuffer set with CL_FALSE above */
  			clFinish(clState->commandQueue);
  		}
  		status = queue_kernel_parameters(clState, &work->blk);
  		if (unlikely(status != CL_SUCCESS))
  			{ applog(LOG_ERR, "Error: clSetKernelArg of all params failed."); goto out; }
  
  		/* MAXBUFFERS entry is used as a flag to say nonces exist */
  		if (res[MAXBUFFERS]) {
  			/* Clear the buffer again */
  			status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
  					BUFFERSIZE, blank_res, 0, NULL, NULL);
  			if (unlikely(status != CL_SUCCESS))
  				{ applog(LOG_ERR, "Error: clEnqueueWriteBuffer failed."); goto out; }
  			if (opt_debug)
  				applog(LOG_DEBUG, "GPU %d found something?", gpu_from_thr_id(thr_id));
  			postcalc_hash_async(mythr, work, res);
  			memset(res, 0, BUFFERSIZE);
  			clFinish(clState->commandQueue);
  		}
  
  		status = clEnqueueNDRangeKernel(clState->commandQueue, *kernel, 1, NULL,
  				globalThreads, localThreads, 0,  NULL, NULL);
  		if (unlikely(status != CL_SUCCESS))
  			{ applog(LOG_ERR, "Error: Enqueueing kernel onto command queue. (clEnqueueNDRangeKernel)"); goto out; }
  
  		status = clEnqueueReadBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
  				BUFFERSIZE, res, 0, NULL, NULL);
  		if (unlikely(status != CL_SUCCESS))
  			{ applog(LOG_ERR, "Error: clEnqueueReadBuffer failed. (clEnqueueReadBuffer)"); goto out;}
  
  		gettimeofday(&tv_end, NULL);
  		timeval_subtract(&diff, &tv_end, &tv_start);
  		hashes_done += hashes;
  		work->blk.nonce += hashes;
  		if (diff.tv_usec > 500000)
  			diff.tv_sec++;
  		if (diff.tv_sec >= cycle) {
  			hashmeter(thr_id, &diff, hashes_done);
  			gettimeofday(&tv_start, NULL);
  			hashes_done = 0;
  		}
  
  		timeval_subtract(&diff, &tv_end, &tv_workstart);
  		if (!requested && (diff.tv_sec > request_interval || work->blk.nonce > request_nonce)) {
  			if (unlikely(!queue_request())) {
  				applog(LOG_ERR, "Failed to queue_request in gpuminer_thread %d", thr_id);
  				goto out;
  			}
  			requested = true;
  		}
  	}
  out:
  	tq_freeze(mythr->q);
  
  	return NULL;
  }
  #endif /* HAVE_OPENCL */
  
  static void restart_threads(bool longpoll)
  {
  	int i;
  
  	/* Discard old queued requests and get new ones */
  	flush_requests(longpoll);
  
  	for (i = 0; i < opt_n_threads + gpu_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;
  	unsigned int i;
  
  	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 initialisation failed");
  		goto out;
  	}
  
  	for (i = 0; i < 36; i++)
  		strcat(longpoll_block, "0");
  
  	while (1) {
  		json_t *val;
  
  		val = json_rpc_call(curl, lp_url, rpc_userpass, rpc_req,
  				    false, true);
  		if (likely(val)) {
  			failures = 0;
  			json_decref(val);
  
  			/* Keep track of who ordered a restart_threads to make
  			 * sure it's only done once per new block */
  			if (likely(!strncmp(longpoll_block, blank, 36) ||
  				!strncmp(longpoll_block, current_block, 36))) {
  					applog(LOG_WARNING, "LONGPOLL detected new block, flushing work queue");
  					restart_threads(true);
  			} else
  				applog(LOG_WARNING, "LONGPOLL received - new block detected and work flushed already");
  		} else {
  			if (failures++ < 10) {
  				sleep(30);
  				applog(LOG_WARNING,
  					"longpoll failed, sleeping for 30s");
  			} else {
  				applog(LOG_ERR,
  					"longpoll failed, ending thread");
  				goto out;
  			}
  		}
  		memcpy(longpoll_block, current_block, 36);
  	}
  
  out:
  	free(hdr_path);
  	free(lp_url);
  	tq_freeze(mythr->q);
  	if (curl)
  		curl_easy_cleanup(curl);
  
  	return NULL;
  }
  
  /* Makes sure the hashmeter keeps going even if mining threads stall */
  static void *wakeup_thread(void *userdata)
  {
  	const unsigned int interval = opt_log_interval / 2 ? : 1;
  	struct timeval zero_tv;
  
  	memset(&zero_tv, 0, sizeof(struct timeval));
  
  	while (1) {
  		sleep(interval);
  		if (requests_queued() < opt_queue)
  			queue_request();
  		hashmeter(-1, &zero_tv, 0);
  		if (unlikely(work_restart[stage_thr_id].restart)) {
  			restart_threads(false);
  			work_restart[stage_thr_id].restart = 0;
  		}
  	}
  
  	return NULL;
  }
  
  int main (int argc, char *argv[])
  {
  	struct thr_info *thr;
  	unsigned int i;
  	char name[32];
  	struct cgpu_info *gpus = NULL, *cpus = NULL;
  
  	if (unlikely(pthread_mutex_init(&time_lock, NULL)))
  		return 1;
  	if (unlikely(pthread_mutex_init(&hash_lock, NULL)))
  		return 1;
  	if (unlikely(pthread_mutex_init(&qd_lock, NULL)))
  		return 1;
  	if (unlikely(pthread_mutex_init(&stgd_lock, NULL)))
  		return 1;
  
  
  #ifdef WIN32
  	opt_n_threads = num_processors = 1;
  #else
  	num_processors = sysconf(_SC_NPROCESSORS_ONLN);
  	opt_n_threads = num_processors;
  #endif /* !WIN32 */
  
  #ifdef HAVE_OPENCL
  	nDevs = clDevicesNum();
  	if (nDevs < 0)
  		return 1;
  
  #endif
  	if (nDevs)
  		opt_n_threads = 0;
  
  	rpc_url = strdup(DEF_RPC_URL);
  
  	/* parse command line */
  	opt_register_table(opt_config_table,
  			   "Options for both config file and command line");
  	opt_register_table(opt_cmdline_table,
  			   "Options for command line only");
  
  	opt_parse(&argc, argv, applog_and_exit);
  	if (argc != 1) {
  		applog(LOG_ERR, "Unexpected extra commandline arguments");
  		return 1;
  	}
  
  	gpu_threads = nDevs * opt_g_threads;
  	if (!gpu_threads && !forced_n_threads) {
  		/* Maybe they turned GPU off; restore default CPU 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);
  	}
  
  	if (unlikely(curl_global_init(CURL_GLOBAL_ALL)))
  		return 1;
  #ifdef HAVE_SYSLOG_H
  	if (use_syslog)
  		openlog("cpuminer", LOG_PID, LOG_USER);
  #endif
  
  	work_restart = calloc(opt_n_threads + 4 + gpu_threads, sizeof(*work_restart));
  	if (!work_restart)
  		return 1;
  
  	thr_info = calloc(opt_n_threads + 4 + gpu_threads, sizeof(*thr));
  	if (!thr_info)
  		return 1;
  
  	/* init workio thread info */
  	work_thr_id = opt_n_threads + gpu_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 + gpu_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;
  		}
  		pthread_detach(thr->pth);
  	} else
  		longpoll_thr_id = -1;
  
  	gettimeofday(&total_tv_start, NULL);
  	gettimeofday(&total_tv_end, NULL);
  
  	if (opt_n_threads ) {
  		cpus = calloc(num_processors, sizeof(struct cgpu_info));
  		if (unlikely(!cpus)) {
  			applog(LOG_ERR, "Failed to calloc cpus");
  			return 1;
  		}
  	}
  	if (gpu_threads) {
  		gpus = calloc(nDevs, sizeof(struct cgpu_info));
  		if (unlikely(!gpus)) {
  			applog(LOG_ERR, "Failed to calloc gpus");
  			return 1;
  		}
  	}
  
  	stage_thr_id = opt_n_threads + gpu_threads + 3;
  	thr = &thr_info[stage_thr_id];
  	thr->q = tq_new();
  	if (!thr->q)
  		return 1;
  	/* start stage thread */
  	if (pthread_create(&thr->pth, NULL, stage_thread, thr)) {
  		applog(LOG_ERR, "stage thread create failed");
  		return 1;
  	}
  
  	/* Put enough work in the queue */
  	for (i = 0; i < opt_queue + opt_n_threads + gpu_threads; i++) {
  		if (unlikely(!queue_request())) {
  			applog(LOG_ERR, "Failed to queue_request in main");
  			return 1;
  		}
  		inc_staged(1, true);
  	}
  
  #ifdef HAVE_OPENCL
  	/* start GPU mining threads */
  	for (i = 0; i < gpu_threads; i++) {
  		int gpu = gpu_from_thr_id(i);
  
  		thr = &thr_info[i];
  		thr->id = i;
  		gpus[gpu].is_gpu = 1;
  		gpus[gpu].cpu_gpu = gpu;
  		thr->cgpu = &gpus[gpu];
  
  		thr->q = tq_new();
  		if (!thr->q) {
  			applog(LOG_ERR, "tq_new failed in starting gpu mining threads");
  			return 1;
  		}
  
  		applog(LOG_INFO, "Init GPU thread %i", i);
  		clStates[i] = initCl(gpu, name, sizeof(name));
  		if (!clStates[i]) {
  			applog(LOG_ERR, "Failed to init GPU thread %d", i);
  			continue;
  		}
  		applog(LOG_INFO, "initCl() finished. Found %s", name);
  
  		if (unlikely(pthread_create(&thr->pth, NULL, gpuminer_thread, thr))) {
  			applog(LOG_ERR, "thread %d create failed", i);
  			return 1;
  		}
  		pthread_detach(thr->pth);
  	}
  
  	applog(LOG_INFO, "%d gpu miner threads started", i);
  #endif
  
  	/* start CPU mining threads */
  	for (i = gpu_threads; i < gpu_threads + opt_n_threads; i++) {
  		int cpu = cpu_from_thr_id(i);
  
  		thr = &thr_info[i];
  
  		thr->id = i;
  		cpus[cpu].cpu_gpu = cpu;
  		thr->cgpu = &cpus[cpu];
  
  		thr->q = tq_new();
  		if (!thr->q) {
  			applog(LOG_ERR, "tq_new failed in starting cpu mining threads");
  			return 1;
  		}
  
  		if (unlikely(pthread_create(&thr->pth, NULL, miner_thread, thr))) {
  			applog(LOG_ERR, "thread %d create failed", i);
  			return 1;
  		}
  		pthread_detach(thr->pth);
  	}
  
  	applog(LOG_INFO, "%d cpu miner threads started, "
  		"using SHA256 '%s' algorithm.",
  		opt_n_threads,
  		algo_names[opt_algo]);
  
  	thr = &thr_info[opt_n_threads + gpu_threads + 2];
  	/* start wakeup thread */
  	if (pthread_create(&thr->pth, NULL, wakeup_thread, NULL)) {
  		applog(LOG_ERR, "wakeup thread create failed");
  		return 1;
  	}
  
  	/* Restart count as it will be wrong till all threads are started */
  	pthread_mutex_lock(&hash_lock);
  	gettimeofday(&total_tv_start, NULL);
  	gettimeofday(&total_tv_end, NULL);
  	total_mhashes_done = 0;
  	pthread_mutex_unlock(&hash_lock);
  
  	/* main loop - simply wait for workio thread to exit */
  	pthread_join(thr_info[work_thr_id].pth, NULL);
  	curl_global_cleanup();
  	if (gpu_threads)
  		free(gpus);
  	if (opt_n_threads)
  		free(cpus);
  
  	applog(LOG_INFO, "workio thread dead, exiting.");
  
  	return 0;
  }
  
  

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