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这是阻塞式 C API。连接到一台服务器后获取 key，并立即释放。
#include "ticketing/ticketing.h"
const char* addrs[1] = {"127.0.0.1:5225"};
ticketing_broker* broker = ticketing_connect(addrs, 1);
ticketing_wait_ready(broker, 2000);
ticketing_ticket* ticket = NULL;
ticketing_result r = ticketing_acquire(broker, "key", 5, 30, &ticket);
bool held = false;
ticketing_release(ticket, &held);
ticketing_ticket_close(ticket);
printf("pass\n");
ticketing_broker_close(broker);这是一个验证示例：多个 pthread 通过账户级锁互斥地反复存取款，确认余额最终总能回到初始值。
static void* transaction(void* arg) {
op_t* op = (op_t*)arg;
char key[32];
snprintf(key, sizeof(key), "account-%d", op->account);
ticketing_ticket* ticket = NULL;
ticketing_result r = ticketing_acquire(g_broker, key, WAIT, LEASE, &ticket);
if (r != TICKETING_OK) {
fprintf(stderr, "account %d acquire failed: %s\n", op->account, ticketing_strerror(r));
return NULL;
}
int64_t before = balances[op->account];
sched_yield(); // 仅在持有锁期间的临界区是安全的
int64_t after = before + op->delta;
balances[op->account] = after;
ticketing_ticket_close(ticket); // 后台自动释放
const char* action = op->delta < 0 ? "withdraw" : "deposit";
fprintf(stderr, "account %d %s $%" PRId64 " -> $%" PRId64 "\n", op->account, action, op->delta, after);
return NULL;
}