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Wayland: Improve event processing with timeout
If the polling was interrupted by a signal or by incomplete or unrelated data on any file descriptor, handleEvents could return before the full timeout had elapsed. This retries the Wayland prepare-to-read and poll until the full timeout has elapsed or until any event was processed. Unfortunately, due to how the Wayland client API is designed, this also includes the delete_id for the frame callback created by eglSwapBuffers. This means glfwWaitEvents* are still not fully functional on Wayland. See #1911 for more details.
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@ -737,6 +737,7 @@ static GLFWbool flushDisplay(void)
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static void handleEvents(double* timeout)
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{
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GLFWbool event = GLFW_FALSE;
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struct pollfd fds[] =
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{
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{ wl_display_get_fd(_glfw.wl.display), POLLIN },
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@ -744,31 +745,38 @@ static void handleEvents(double* timeout)
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{ _glfw.wl.cursorTimerfd, POLLIN },
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};
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while (wl_display_prepare_read(_glfw.wl.display) != 0)
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wl_display_dispatch_pending(_glfw.wl.display);
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// If an error other than EAGAIN happens, we have likely been disconnected
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// from the Wayland session; try to handle that the best we can.
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if (!flushDisplay())
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while (!event)
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{
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wl_display_cancel_read(_glfw.wl.display);
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while (wl_display_prepare_read(_glfw.wl.display) != 0)
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wl_display_dispatch_pending(_glfw.wl.display);
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_GLFWwindow* window = _glfw.windowListHead;
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while (window)
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// If an error other than EAGAIN happens, we have likely been disconnected
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// from the Wayland session; try to handle that the best we can.
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if (!flushDisplay())
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{
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_glfwInputWindowCloseRequest(window);
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window = window->next;
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wl_display_cancel_read(_glfw.wl.display);
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_GLFWwindow* window = _glfw.windowListHead;
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while (window)
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{
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_glfwInputWindowCloseRequest(window);
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window = window->next;
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}
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return;
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}
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return;
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}
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if (!_glfwPollPOSIX(fds, 3, timeout))
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{
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wl_display_cancel_read(_glfw.wl.display);
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return;
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}
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if (_glfwPollPOSIX(fds, 3, timeout))
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{
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if (fds[0].revents & POLLIN)
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{
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wl_display_read_events(_glfw.wl.display);
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wl_display_dispatch_pending(_glfw.wl.display);
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if (wl_display_dispatch_pending(_glfw.wl.display) > 0)
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event = GLFW_TRUE;
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}
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else
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wl_display_cancel_read(_glfw.wl.display);
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@ -789,6 +797,8 @@ static void handleEvents(double* timeout)
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_glfwInputTextWayland(_glfw.wl.keyboardFocus,
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_glfw.wl.keyboardLastScancode);
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}
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event = GLFW_TRUE;
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}
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}
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@ -797,11 +807,12 @@ static void handleEvents(double* timeout)
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uint64_t repeats;
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if (read(_glfw.wl.cursorTimerfd, &repeats, sizeof(repeats)) == 8)
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{
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incrementCursorImage(_glfw.wl.pointerFocus);
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event = GLFW_TRUE;
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}
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}
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}
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else
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wl_display_cancel_read(_glfw.wl.display);
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}
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//////////////////////////////////////////////////////////////////////////
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