Function usage

lib_acl_cpp/samples/mem_cache/main.cpp:11–14

static const char* __key = "test";

static void usage(const char* procname)
{
	printf("usage: %s -h[help] -l addr -g[get] -s[set] -d[del] -m[update timeout] -n num -t timeout -T nthread\n", procname);
}

static void get(const char* addr, int id, int num)
{