sync code with last improvements from OpenBSD

xserver/Xext/syncsdk.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2010 NVIDIA Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+#ifndef _SYNCSDK_H_
+#define _SYNCSDK_H_
+
+#include "misync.h"
+
+extern _X_EXPORT int
+ SyncVerifyFence(SyncFence ** ppFence, XID fid, ClientPtr client, Mask mode);
+
+extern _X_EXPORT SyncObject*
+ SyncCreate(ClientPtr client, XID id, unsigned char type);
+
+#define VERIFY_SYNC_FENCE(pFence, fid, client, mode)			\
+    do {								\
+	int rc;								\
+	rc = SyncVerifyFence(&(pFence), (fid), (client), (mode));	\
+	if (Success != rc) return rc;					\
+    } while (0)
+
+#define VERIFY_SYNC_FENCE_OR_NONE(pFence, fid, client, mode)		\
+    do {								\
+        pFence = 0;							\
+        if (None != fid)						\
+	    VERIFY_SYNC_FENCE((pFence), (fid), (client), (mode));	\
+    } while (0)
+
+#endif                          /* _SYNCSDK_H_ */