master() {
	if (( active >= concurrency)) || [ -n "$quit" ]
	then
		sleep 0.1
	else
		echo '
			SELECT	COUNT(*)
			FROM	tasks
			WHERE	status = 0;

			SELECT	COUNT(*)
			FROM	tasks
			WHERE	status = 0
			AND	requires is NULL;

			SELECT
				id,
				source_file,
				required,
				cmd_arg0,
				cmd_arg1,
				cmd_arg2,
				cmd_arg3,
				cmd_arg4,
				cmd_arg5,
				cmd_arg6,
				cmd_arg7,
				cmd_arg8,
				cmd_arg9,
				cmd_arg10,
				cmd_arg11,
				cmd_arg12,
				cmd_arg13,
				cmd_arg14,
				cmd_arg15,
				cmd_arg16,
				cmd_arg17,
				cmd_arg18,
				cmd_arg19,
				cmd_arg20,
				cmd_arg21,
				cmd_arg22,
				cmd_arg23,
				cmd_arg24,
				cmd_arg25,
				cmd_arg26,
				cmd_arg27,
				cmd_arg28,
				cmd_arg29,
				cleanup,
				fileid,
				filename
			FROM	tasks
			WHERE	status = 0
			AND	requires is NULL
			ORDER BY source_file
			LIMIT 1;
		' >&3
		read -u4 remaining
		read -u4 ready
		if (( remaining == 0 ))
		then
			sleep 0.1
			continue
		elif (( ready == 0 ))
		then
			sleep 0.1
		else
			(( ++active ))
			read -u4 line
			taskid=${line%%|*}
			rest="${line#*|}|"
			sourcefileid=${rest%%|*}
			rest=${rest#*|}
			required=${rest%%|*}
			rest=${rest#*|}
			cmd_arg=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cmd_arg+=("${rest%%|*}")
			rest=${rest#*|}
			cleanup=${rest%%|*}
			rest=${rest#*|}
			destfileid=${rest%%|*}
			rest=${rest#*|}
			destfilename=${rest%%|*}
			rest=${rest#*|}
			for key in ${!cmd_arg[@]}
			do
				[ -z "${cmd_arg[key]}" ] && unset cmd_arg[key]
			done
			workerid=$(getworkerid)
			workertasks[workerid]=$taskid
			Update tasks status 1 <<<"id = $taskid"
			createworker $workerid
		fi
	fi
}