Block for other threads in _XUserLockDisplay

Wait for all other threads to release the user-level lock when acquiring it. This ensures that only one thread at a time holds the user-level lock, necessary as it is a nesting lock and a single variable is used to determine when the lock is nesting and when it is contended. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Jamey Sharp <jamey@minilop.net> Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>

Block for other threads in _XUserLockDisplay
3d37513e · Keith Packard · Ulrich Sibiller · e8e91b69 · 3d37513e
Commit 3d37513e authored Mar 04, 2012 by Keith Packard Committed by Ulrich Sibiller Oct 19, 2016
Hide whitespace changes
Inline Side-by-side

Showing with 2 additions and 0 deletions

locking.c nx-X11/lib/X11/locking.c +2 -0

No files found.
--- a/nx-X11/lib/X11/locking.c
+++ b/nx-X11/lib/X11/locking.c
@@ -486,6 +486,8 @@ static void _XInternalLockDisplay(
 static void _XUserLockDisplay(
    register Display* dpy)
 {
+    _XDisplayLockWait(dpy);
    if (++dpy->lock->locking_level == 1) {
 	dpy->lock->lock_wait = _XDisplayLockWait;
 	dpy->lock->locking_thread = xthread_self();