Function usage

lib_acl_cpp/samples/benchmark/rosksdb/main.cpp:102–109

};

static void usage(const char* procname)
{
	printf("usage: %s -h [help]\r\n"
		" -c threads_count\r\n"
		" -a action[default: get, add|get|del]\r\n"
		" -n max_loop\r\n"
		, procname);		
}

int main(int argc, char* argv[]) {
	const char* dbpath = "./db";