Function wait_connection_ready

src/ui/httpd.c:166–187

Wait against the caller's absolute deadline. Windows uses short select() * slices because shutdown() from the stop thread does not reliably wake a * Winsock select(); POSIX keeps its one-shot poll wait and shutdown fast path. * 1 = ready, 0 = original deadline expired, -1 = interrupted/error. */

 * Winsock select(); POSIX keeps its one-shot poll wait and shutdown fast path.
 * 1 = ready, 0 = original deadline expired, -1 = interrupted/error. */
static int wait_connection_ready(cbm_http_conn_t *connection, bool writing, int64_t deadline) {
    for (;;) {
        if (connection_interrupted(connection))
            return -1;

        int64_t remaining = deadline - now_ms();
        if (remaining <= 0)
            return 0;
        int timeout_ms = remaining > INT_MAX ? INT_MAX : (int)remaining;
#ifdef _WIN32
        if (timeout_ms > CBM_HTTP_WAIT_SLICE_MS)
            timeout_ms = CBM_HTTP_WAIT_SLICE_MS;
#endif

        int ready = wait_ready(connection->fd, writing, timeout_ms);
        if (connection_interrupted(connection))
            return -1;
        if (ready != 0)
            return ready;
        /* A Windows slice or POSIX EINTR is not the caller's timeout. */
    }
}

static int send_all(cbm_http_conn_t *connection, const void *data, size_t len, int64_t deadline) {
    const char *p = data;