mirror of
https://gitlab.freedesktop.org/mesa/vulkan-wsi-layer.git
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080d5d2bf7
Reduce the number of functions that are exported by the layer. This helps resolve dynamic linking issues where multiple functions are named the same in different shared libraries. Also add function specifiers and calling conventions to all extern "C" functions. Change-Id: I07b33ff8d066e33c5dbdf0cbc13aa7835a78220b Signed-off-by: Dennis Tsiang <dennis.tsiang@arm.com>
117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
/*
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* Copyright (c) 2017-2019, 2021 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "wl_helpers.hpp"
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#include <cstring>
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#include <memory>
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#include <poll.h>
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#include <errno.h>
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#include <cassert>
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#include "wl_object_owner.hpp"
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#include "util/log.hpp"
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int dispatch_queue(struct wl_display *display, struct wl_event_queue *queue, int timeout)
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{
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int err;
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struct pollfd pfd = {};
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int retval;
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/* Before we sleep, dispatch any pending events. prepare_read_queue will return 0 whilst there are pending
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* events to dispatch on the queue. */
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while (0 != wl_display_prepare_read_queue(display, queue))
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{
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/* dispatch_queue_pending returns -1 on error, or the number of events dispatched otherwise. If we
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* already dispatched some events, then we might not need to sleep, as we might have just dispatched
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* the event we want, so return immediately. */
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err = wl_display_dispatch_queue_pending(display, queue);
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if (err)
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{
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return (0 > err) ? -1 : 1;
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}
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}
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/* wl_display_read_events performs a non-blocking read. */
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pfd.fd = wl_display_get_fd(display);
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pfd.events = POLLIN;
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while (true)
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{
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/* Timeout is given in milliseconds. A return value of 0, or -1 with errno set to EINTR means that we
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* should retry as the timeout was exceeded or we were interrupted by a signal, respectively. A
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* return value of 1 means that something happened, and we should inspect the pollfd structure to see
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* just what that was.
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*/
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err = poll(&pfd, 1, timeout);
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if (0 == err)
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{
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/* Timeout. */
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wl_display_cancel_read(display);
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return 0;
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}
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else if (-1 == err)
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{
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if (EINTR == errno)
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{
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/* Interrupted by a signal; restart. This resets the timeout. */
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continue;
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}
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else
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{
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/* Something else bad happened; abort. */
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wl_display_cancel_read(display);
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return -1;
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}
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}
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else
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{
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if (POLLIN == pfd.revents)
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{
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/* We have data to read, and no errors; proceed to read_events. */
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break;
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}
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else
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{
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/* An error occurred, e.g. file descriptor was closed from underneath us. */
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wl_display_cancel_read(display);
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return -1;
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}
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}
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}
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/* Actually read the events from the display. A failure in read_events calls cancel_read internally for us,
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* so we don't need to do that here. */
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err = wl_display_read_events(display);
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if (0 != err)
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{
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return -1;
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}
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/* Finally, if we read any events relevant to our queue, we can dispatch them. */
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err = wl_display_dispatch_queue_pending(display, queue);
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retval = err < 0 ? -1 : 1;
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return retval;
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}
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