Function hid_read_timeout

dependencies/hidapi/hidapi.c:945–1028

int HID_API_EXPORT hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds)
{
	int bytes_read = -1;

#if 1
	int transferred;
	int res = libusb_interrupt_transfer(dev->device_handle, dev->input_endpoint, data, length, &transferred, 5000);
	LOG("transferred: %d\n", transferred);
	return transferred;
#endif

	//pthread_mutex_lock(&dev->mutex);
	//pthread_cleanup_push(&cleanup_mutex, dev);

	/* There's an input report queued up. Return it. */
	if (dev->input_reports) {
		/* Return the first one */
		bytes_read = return_data(dev, data, length);
		goto ret;
	}

	if (dev->shutdown_thread) {
		/* This means the device has been disconnected.
		   An error code of -1 should be returned. */
		bytes_read = -1;
		goto ret;
	}

	if (milliseconds == -1) {
		/* Blocking */
		while (!dev->input_reports && !dev->shutdown_thread) {
			//pthread_cond_wait(&dev->condition, &dev->mutex);
		}
		if (dev->input_reports) {
			bytes_read = return_data(dev, data, length);
		}
	}
	else if (milliseconds > 0) {
		/* Non-blocking, but called with timeout. */
		int res;
		struct timespec ts;
		clock_gettime(CLOCK_REALTIME, &ts);
		ts.tv_sec += milliseconds / 1000;
		ts.tv_nsec += (milliseconds % 1000) * 1000000;
		if (ts.tv_nsec >= 1000000000L) {
			ts.tv_sec++;
			ts.tv_nsec -= 1000000000L;
		}

		while (!dev->input_reports && !dev->shutdown_thread) {
			//res = pthread_cond_timedwait(&dev->condition, &dev->mutex, &ts);
			if (res == 0) {
				if (dev->input_reports) {
					bytes_read = return_data(dev, data, length);
					break;
				}

				/* If we're here, there was a spurious wake up