1 files changed, 86 insertions, 0 deletions
diff --git a/libX11/src/LockDis.c b/libX11/src/LockDis.c
new file mode 100644
index 000000000..d99d3bb68
--- /dev/null
+++ b/libX11/src/LockDis.c
@@ -0,0 +1,86 @@
+/* $Xorg: LockDis.c,v 1.4 2001/02/09 02:03:34 xorgcvs Exp $ */
+
+/*
+ 
+Copyright 1993, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+/* $XFree86$ */
+
+/*
+ * Author: Stephen Gildea, MIT X Consortium
+ *
+ * XLockDis.c - multi-thread application-level locking routines
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#ifdef XTHREADS
+#include "locking.h"
+#endif
+
+void
+XLockDisplay(
+    register Display* dpy)
+{
+#ifdef XTHREADS
+    LockDisplay(dpy);
+    if (dpy->lock)
+	(*dpy->lock->user_lock_display)(dpy);
+    /*
+     * We want the threads in the reply queue to all get out before
+     * XLockDisplay returns, in case they have any side effects the
+     * caller of XLockDisplay was trying to protect against.
+     * XLockDisplay puts itself at the head of the event waiters queue
+     * to wait for all the replies to come in.
+     */
+    if (dpy->lock && dpy->lock->reply_awaiters) {
+	struct _XCVList *cvl;
+
+	cvl = (*dpy->lock->create_cvl)(dpy);
+
+	/* stuff ourselves on the head of the queue */
+	cvl->next = dpy->lock->event_awaiters;
+	dpy->lock->event_awaiters = cvl;
+
+	while (dpy->lock->reply_awaiters)
+	    ConditionWait(dpy, cvl->cv);
+	UnlockNextEventReader(dpy); /* pass the signal on */
+    }
+    UnlockDisplay(dpy);
+#endif
+}
+
+void
+XUnlockDisplay(
+    register Display* dpy)
+{
+#ifdef XTHREADS
+    LockDisplay(dpy);
+    if (dpy->lock)
+	(*dpy->lock->user_unlock_display)(dpy);
+    UnlockDisplay(dpy);
+#endif
+}