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[client] x11: serialize pointer grab state

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This commit is contained in:
Geoffrey McRae
2026-08-06 14:54:05 +10:00
parent 023430da31
commit 997c690e04
2 changed files with 33 additions and 11 deletions
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42
client/displayservers/X11/x11.c
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@@ -341,6 +341,7 @@ static bool x11Init(const LG_DSInitParams params)
XSetIOErrorHandler(x11IOErrorHandler);
memset(&x11, 0, sizeof(x11));
LG_LOCK_INIT(x11.pointerLock);
atomic_init(&x11.captureActive, false);
atomic_init(&x11.pointerGrabbed, false);
x11.xValuator = -1;
@@ -869,6 +870,7 @@ static void x11Free(void)
if (x11.cursors[i])
XFreeCursor(x11.display, x11.cursors[i]);
LG_LOCK_FREE(x11.pointerLock);
x11.wm->deinit();
XCloseDisplay(x11.display);
}
@@ -1886,10 +1888,10 @@ static void x11PrintGrabError(const char * type, int dev, Status ret)
}
static void x11GrabPointer(void)
static bool x11GrabPointerLocked(void)
{
if (atomic_load_explicit(&x11.pointerGrabbed, memory_order_acquire))
return;
return true;
unsigned char mask_bits[XIMaskLen(XI_LASTEVENT)] = { 0 };
XIEventMask mask = {
@@ -1934,16 +1936,22 @@ static void x11GrabPointer(void)
if (ret != Success)
{
x11PrintGrabError("pointer", x11.pointerDev, ret);
return;
return false;
}
atomic_store_explicit(&x11.pointerGrabbed, true, memory_order_release);
return true;
}
static void x11UngrabPointer(void)
static void x11GrabPointer(void)
{
atomic_store_explicit(&x11.captureActive, false, memory_order_release);
LG_LOCK(x11.pointerLock);
x11GrabPointerLocked();
LG_UNLOCK(x11.pointerLock);
}
static void x11UngrabPointerLocked(void)
{
if (!atomic_load_explicit(&x11.pointerGrabbed, memory_order_acquire))
{
app_handleGrabEvent(false);
@@ -1957,6 +1965,14 @@ static void x11UngrabPointer(void)
app_handleGrabEvent(false);
}
static void x11UngrabPointer(void)
{
LG_LOCK(x11.pointerLock);
atomic_store_explicit(&x11.captureActive, false, memory_order_release);
x11UngrabPointerLocked();
LG_UNLOCK(x11.pointerLock);
}
static bool x11IsPointerGrabbed(void)
{
return atomic_load_explicit(&x11.pointerGrabbed, memory_order_acquire);
@@ -1964,14 +1980,17 @@ static bool x11IsPointerGrabbed(void)
static void x11CapturePointer(void)
{
x11GrabPointer();
atomic_store_explicit(&x11.captureActive,
atomic_load_explicit(&x11.pointerGrabbed, memory_order_acquire),
memory_order_release);
LG_LOCK(x11.pointerLock);
const bool active = x11GrabPointerLocked();
atomic_store_explicit(&x11.captureActive, active, memory_order_release);
LG_UNLOCK(x11.pointerLock);
}
static void x11UncapturePointer(void)
{
const bool ungrab = !app_isFormatValid() || app_isCaptureOnlyMode();
LG_LOCK(x11.pointerLock);
atomic_store_explicit(&x11.captureActive, false, memory_order_release);
/* we need to ungrab the pointer on the following conditions when exiting capture mode:
@@ -1980,8 +1999,9 @@ static void x11UncapturePointer(void)
* window when we release it.
* - if the user has opted to use captureInputOnly mode.
*/
if (!app_isFormatValid() || app_isCaptureOnlyMode())
x11UngrabPointer();
if (ungrab)
x11UngrabPointerLocked();
LG_UNLOCK(x11.pointerLock);
}
static bool x11IsPointerCaptured(void)