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X11: Clean up event wait timeout logic

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Simplify interface and implement timeout updating.
This commit is contained in:
Camilla Berglund 2016-08-10 00:33:07 +02:00
parent f88a609000
commit ad9233e620
1 changed files with 30 additions and 40 deletions
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70
src/x11_window.c
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@ -53,13 +53,11 @@
// This avoids blocking other threads via the per-display Xlib lock that also
// covers GLX functions
//
void selectDisplayConnection(struct timeval* timeout)
static GLFWbool waitForEvent(double* timeout)
{
fd_set fds;
int result, count;
const int fd = ConnectionNumber(_glfw.x11.display);
count = fd + 1;
int count = fd + 1;
FD_ZERO(&fds);
FD_SET(fd, &fds);
@ -69,15 +67,29 @@ void selectDisplayConnection(struct timeval* timeout)
if (fd < _glfw.linux_js.inotify)
count = _glfw.linux_js.inotify + 1;
#endif
// NOTE: Only retry on EINTR if there is no timeout, as select is not
// required to update it for the time elapsed
// TODO: Update timeout value manually
do
for (;;)
{
result = select(count, &fds, NULL, NULL, timeout);
if (timeout)
{
const long seconds = (long) *timeout;
const long microseconds = (long) ((*timeout - seconds) * 1e6);
struct timeval tv = { seconds, microseconds };
const uint64_t base = _glfwPlatformGetTimerValue();
const int result = select(count, &fds, NULL, NULL, &tv);
const int error = errno;
*timeout -= (_glfwPlatformGetTimerValue() - base) /
(double) _glfwPlatformGetTimerFrequency();
if (result > 0)
return GLFW_TRUE;
if ((result == -1 && error == EINTR) || *timeout <= 0.0)
return GLFW_FALSE;
}
else if (select(count, &fds, NULL, NULL, NULL) != -1 || errno != EINTR)
return GLFW_TRUE;
}
while (result == -1 && errno == EINTR && timeout == NULL);
}
// Returns whether the window is iconified
@ -818,7 +830,7 @@ static void pushSelectionToManager(_GLFWwindow* window)
}
}
selectDisplayConnection(NULL);
waitForEvent(NULL);
}
}
@ -1793,16 +1805,14 @@ void _glfwPlatformGetWindowFrameSize(_GLFWwindow* window,
if (!_glfwPlatformWindowVisible(window) &&
_glfw.x11.NET_REQUEST_FRAME_EXTENTS)
{
uint64_t base;
XEvent event;
double timeout = 0.5;
// Ensure _NET_FRAME_EXTENTS is set, allowing glfwGetWindowFrameSize to
// function before the window is mapped
sendEventToWM(window, _glfw.x11.NET_REQUEST_FRAME_EXTENTS,
0, 0, 0, 0, 0);
base = _glfwPlatformGetTimerValue();
// HACK: Use a timeout because earlier versions of some window managers
// (at least Unity, Fluxbox and Xfwm) failed to send the reply
// They have been fixed but broken versions are still in the wild
@ -1813,21 +1823,12 @@ void _glfwPlatformGetWindowFrameSize(_GLFWwindow* window,
isFrameExtentsEvent,
(XPointer) window))
{
double remaining;
struct timeval timeout;
remaining = 0.5 - (_glfwPlatformGetTimerValue() - base) /
(double) _glfwPlatformGetTimerFrequency();
if (remaining <= 0.0)
if (!waitForEvent(&timeout))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"X11: The window manager has a broken _NET_REQUEST_FRAME_EXTENTS implementation; please report this issue");
return;
}
timeout.tv_sec = 0;
timeout.tv_usec = (long) (remaining * 1e6);
selectDisplayConnection(&timeout);
}
}
@ -2048,28 +2049,17 @@ void _glfwPlatformPollEvents(void)
void _glfwPlatformWaitEvents(void)
{
while (!XPending(_glfw.x11.display))
selectDisplayConnection(NULL);
waitForEvent(NULL);
_glfwPlatformPollEvents();
}
void _glfwPlatformWaitEventsTimeout(double timeout)
{
const double deadline = timeout + _glfwPlatformGetTimerValue() /
(double) _glfwPlatformGetTimerFrequency();
while (!XPending(_glfw.x11.display))
{
const double remaining = deadline - _glfwPlatformGetTimerValue() /
(double) _glfwPlatformGetTimerFrequency();
if (remaining <= 0.0)
return;
const long seconds = (long) remaining;
const long microseconds = (long) ((remaining - seconds) * 1e6);
struct timeval tv = { seconds, microseconds };
selectDisplayConnection(&tv);
if (!waitForEvent(&timeout))
break;
}
_glfwPlatformPollEvents();
@ -2261,7 +2251,7 @@ const char* _glfwPlatformGetClipboardString(_GLFWwindow* window)
window->x11.handle, CurrentTime);
while (!XCheckTypedEvent(_glfw.x11.display, SelectionNotify, &event))
selectDisplayConnection(NULL);
waitForEvent(NULL);
if (event.xselection.property == None)
continue;