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[client] wayland: lock confine-related code to avoid race

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This should fix the occasional Wayland protocol errors that arise when
the UI thread and the cursor thread race.

Example of error that is fixed:

    zwp_pointer_constraints_v1@11: error 1: a pointer constraint with a wl_pointer of the same wl_seat is already on this surface
This commit is contained in:
Quantum 2021-06-06 01:28:22 -04:00 committed by Geoffrey McRae
parent f07e4839b1
commit 4b99bba200
2 changed files with 87 additions and 61 deletions
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147
client/displayservers/Wayland/input.c
View File

@ -301,12 +301,15 @@ bool waylandInputInit(void)
&relativePointerListener, NULL);
}
LG_LOCK_INIT(wlWm.confineLock);
return true;
}
void waylandInputFree(void)
{
waylandUngrabPointer();
LG_LOCK_FREE(wlWm.confineLock);
wl_pointer_destroy(wlWm.pointer);
wl_keyboard_destroy(wlWm.keyboard);
wl_seat_destroy(wlWm.seat);
@ -326,21 +329,27 @@ void waylandGrabPointer(void)
&relativePointerListener, NULL);
}
if (!wlWm.confinedPointer)
INTERLOCKED_SECTION(wlWm.confineLock,
{
wlWm.confinedPointer = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
}
if (!wlWm.confinedPointer)
{
wlWm.confinedPointer = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
}
});
}
void waylandUngrabPointer(void)
{
if (wlWm.confinedPointer)
INTERLOCKED_SECTION(wlWm.confineLock,
{
zwp_confined_pointer_v1_destroy(wlWm.confinedPointer);
wlWm.confinedPointer = NULL;
}
if (wlWm.confinedPointer)
{
zwp_confined_pointer_v1_destroy(wlWm.confinedPointer);
wlWm.confinedPointer = NULL;
}
});
if (!wlWm.warpSupport)
{
@ -366,41 +375,48 @@ void waylandCapturePointer(void)
return;
}
if (wlWm.confinedPointer)
INTERLOCKED_SECTION(wlWm.confineLock,
{
zwp_confined_pointer_v1_destroy(wlWm.confinedPointer);
wlWm.confinedPointer = NULL;
}
if (wlWm.confinedPointer)
{
zwp_confined_pointer_v1_destroy(wlWm.confinedPointer);
wlWm.confinedPointer = NULL;
}
wlWm.lockedPointer = zwp_pointer_constraints_v1_lock_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
wlWm.lockedPointer = zwp_pointer_constraints_v1_lock_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
});
}
void waylandUncapturePointer(void)
{
if (wlWm.lockedPointer)
INTERLOCKED_SECTION(wlWm.confineLock,
{
zwp_locked_pointer_v1_destroy(wlWm.lockedPointer);
wlWm.lockedPointer = NULL;
}
if (wlWm.lockedPointer)
{
zwp_locked_pointer_v1_destroy(wlWm.lockedPointer);
wlWm.lockedPointer = NULL;
}
/* we need to ungrab the pointer on the following conditions when exiting capture mode:
* - if warp is not supported, exit via window edge detection will never work
* as the cursor can not be warped out of the window when we release it.
* - if the format is invalid as we do not know where the guest cursor is,
* which also breaks edge detection.
* - if the user has opted to use captureInputOnly mode.
*/
if (!wlWm.warpSupport || !app_isFormatValid() || app_isCaptureOnlyMode())
{
waylandUngrabPointer();
return;
}
wlWm.confinedPointer = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
/* we need to ungrab the pointer on the following conditions when exiting capture mode:
* - if warp is not supported, exit via window edge detection will never work
* as the cursor can not be warped out of the window when we release it.
* - if the format is invalid as we do not know where the guest cursor is,
* which also breaks edge detection.
* - if the user has opted to use captureInputOnly mode.
*/
if (!wlWm.warpSupport || !app_isFormatValid() || app_isCaptureOnlyMode())
{
waylandUngrabPointer();
}
else
{
wlWm.confinedPointer = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, NULL,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
}
});
}
void waylandGrabKeyboard(void)
@ -423,35 +439,44 @@ void waylandUngrabKeyboard(void)
void waylandWarpPointer(int x, int y, bool exiting)
{
if (!wlWm.pointerInSurface || wlWm.lockedPointer)
if (!wlWm.pointerInSurface)
return;
if (x < 0) x = 0;
else if (x >= wlWm.width) x = wlWm.width - 1;
if (y < 0) y = 0;
else if (y >= wlWm.height) y = wlWm.height - 1;
struct wl_region * region = wl_compositor_create_region(wlWm.compositor);
wl_region_add(region, x, y, 1, 1);
if (wlWm.confinedPointer)
INTERLOCKED_SECTION(wlWm.confineLock,
{
zwp_confined_pointer_v1_set_region(wlWm.confinedPointer, region);
wl_surface_commit(wlWm.surface);
zwp_confined_pointer_v1_set_region(wlWm.confinedPointer, NULL);
}
else
{
struct zwp_confined_pointer_v1 * confine;
confine = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, region,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
wl_surface_commit(wlWm.surface);
zwp_confined_pointer_v1_destroy(confine);
}
if (!wlWm.lockedPointer)
{
LG_UNLOCK(wlWm.confineLock);
return;
}
wl_surface_commit(wlWm.surface);
wl_region_destroy(region);
if (x < 0) x = 0;
else if (x >= wlWm.width) x = wlWm.width - 1;
if (y < 0) y = 0;
else if (y >= wlWm.height) y = wlWm.height - 1;
struct wl_region * region = wl_compositor_create_region(wlWm.compositor);
wl_region_add(region, x, y, 1, 1);
if (wlWm.confinedPointer)
{
zwp_confined_pointer_v1_set_region(wlWm.confinedPointer, region);
wl_surface_commit(wlWm.surface);
zwp_confined_pointer_v1_set_region(wlWm.confinedPointer, NULL);
}
else
{
struct zwp_confined_pointer_v1 * confine;
confine = zwp_pointer_constraints_v1_confine_pointer(
wlWm.pointerConstraints, wlWm.surface, wlWm.pointer, region,
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);
wl_surface_commit(wlWm.surface);
zwp_confined_pointer_v1_destroy(confine);
}
wl_surface_commit(wlWm.surface);
wl_region_destroy(region);
});
}
void waylandRealignPointer(void)

1
client/displayservers/Wayland/wayland.h
View File

@ -141,6 +141,7 @@ struct WaylandDSState
struct zwp_locked_pointer_v1 * lockedPointer;
bool showPointer;
uint32_t pointerEnterSerial;
LG_Lock confineLock;
struct zwp_idle_inhibit_manager_v1 * idleInhibitManager;
struct zwp_idle_inhibitor_v1 * idleInhibitor;