ASYNC_init_thread
async_init = ASYNC_init_thread(async_jobs, async_jobs);
if (ASYNC_init_thread(0, 0) == 0)
int ASYNC_init_thread(size_t max_size, size_t init_size);
if (!ASYNC_init_thread(2, 0)
if (!ASYNC_init_thread(1, 0)
if (!ASYNC_init_thread(1, 0)
if (!ASYNC_init_thread(1, 0)
if (!ASYNC_init_thread(1, 0)
if (!ASYNC_init_thread(1, 0)
if (!ASYNC_init_thread(1, 1)) {