C++ (Cpp) lws_plat_change_pollfd Examples

Example #1

File: pollfd.c Project: nkhorman/libwebsockets

int
lws_change_pollfd(struct libwebsocket *wsi, int _and, int _or)
{
	if (!wsi || !wsi->protocol || wsi->position_in_fds_table < 0)
		return 1;
	struct libwebsocket_context *context = wsi->protocol->owning_server;
	if (!context)
		return 1;
	int tid;
	int sampled_tid;
	struct libwebsocket_pollfd *pfd;
	struct libwebsocket_pollargs pa;

	pfd = &context->fds[wsi->position_in_fds_table];
	pa.fd = wsi->sock;

	context->protocols[0].callback(context, wsi,
		LWS_CALLBACK_LOCK_POLL, wsi->user_space,  (void *) &pa, 0);

	pa.prev_events = pfd->events;
	pa.events = pfd->events = (pfd->events & ~_and) | _or;

	context->protocols[0].callback(context, wsi,
			LWS_CALLBACK_CHANGE_MODE_POLL_FD,
				wsi->user_space, (void *) &pa, 0);

	/*
	 * if we changed something in this pollfd...
	 *   ... and we're running in a different thread context
	 *     than the service thread...
	 *       ... and the service thread is waiting ...
	 *         then cancel it to force a restart with our changed events
	 */
	if (pa.prev_events != pa.events) {
		
		if (lws_plat_change_pollfd(context, wsi, pfd)) {
			lwsl_info("%s failed\n", __func__);
			return 1;
		}

		sampled_tid = context->service_tid;
		if (sampled_tid) {
			tid = context->protocols[0].callback(context, NULL,
				     LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
			if (tid != sampled_tid)
				libwebsocket_cancel_service(context);
		}
	}

	context->protocols[0].callback(context, wsi,
		LWS_CALLBACK_UNLOCK_POLL, wsi->user_space, (void *) &pa, 0);
	
	return 0;
}

Example #2

File: pollfd.c Project: 5ouya/raspC

int
_lws_change_pollfd(struct lws *wsi, int _and, int _or, struct lws_pollargs *pa)
{
	struct lws_context_per_thread *pt;
	struct lws_context *context;
	int ret = 0, pa_events = 1;
	struct lws_pollfd *pfd;
	int sampled_tid, tid;

	if (!wsi || wsi->position_in_fds_table < 0)
		return 0;

	context = wsi->context;
	pt = &context->pt[(int)wsi->tsi];
	assert(wsi->position_in_fds_table >= 0 &&
	       wsi->position_in_fds_table < pt->fds_count);

	pfd = &pt->fds[wsi->position_in_fds_table];
	pa->fd = wsi->sock;
	pa->prev_events = pfd->events;
	pa->events = pfd->events = (pfd->events & ~_and) | _or;

	if (context->protocols[0].callback(wsi, LWS_CALLBACK_CHANGE_MODE_POLL_FD,
					   wsi->user_space, (void *)pa, 0)) {
		ret = -1;
		goto bail;
	}

	/*
	 * if we changed something in this pollfd...
	 *   ... and we're running in a different thread context
	 *     than the service thread...
	 *       ... and the service thread is waiting ...
	 *         then cancel it to force a restart with our changed events
	 */
#if LWS_POSIX
	pa_events = pa->prev_events != pa->events;
#endif
	if (pa_events) {

		if (lws_plat_change_pollfd(context, wsi, pfd)) {
			lwsl_info("%s failed\n", __func__);
			ret = -1;
			goto bail;
		}

		sampled_tid = context->service_tid;
		if (sampled_tid) {
			tid = context->protocols[0].callback(wsi,
				     LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
			if (tid == -1) {
				ret = -1;
				goto bail;
			}
			if (tid != sampled_tid)
				lws_cancel_service_pt(wsi);
		}
	}
bail:
	return ret;
}