1 files changed, 90 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/glx/dri/dri_lock.c b/src/gallium/state_trackers/glx/dri/dri_lock.c
new file mode 100644
index 0000000000..9d7bd61e28
--- /dev/null
+++ b/src/gallium/state_trackers/glx/dri/dri_lock.c
@@ -0,0 +1,90 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+
+#include "pipe/p_thread.h"
+#include "dri_context.h"
+#include "xf86drm.h"
+
+pipe_static_mutex( lockMutex );
+
+static void
+dri_contended_lock(struct dri_context *ctx)
+{
+   __DRIdrawablePrivate *dPriv = ctx->dPriv;
+   __DRIcontextPrivate *cPriv = ctx->cPriv;
+   __DRIscreenPrivate *sPriv = ctx->sPriv;
+
+   drmGetLock(sPriv->fd, cPriv->hHWContext, 0);
+
+   /* Perform round trip communication with server (including dropping
+    * and retaking the above lock) to update window dimensions:
+    */
+   if (dPriv)
+      DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
+}
+
+
+/* Lock the hardware and validate our state.
+ */
+void dri_lock_hardware( struct dri_context *ctx )
+{
+   __DRIscreenPrivate *sPriv = ctx->sPriv;
+   __DRIcontextPrivate *cPriv = ctx->cPriv;
+   char __ret = 0;
+
+   pipe_mutex_lock(lockMutex);
+   assert(!ctx->locked);
+
+   DRM_CAS((drmLock *) &sPriv->pSAREA->lock,
+           cPriv->hHWContext,
+           (DRM_LOCK_HELD | cPriv->hHWContext),
+           __ret);
+
+   if (__ret)
+      dri_contended_lock( ctx );
+
+   ctx->locked = TRUE;
+}
+
+
+/* Unlock the hardware using the global current context
+ */
+void dri_unlock_hardware( struct dri_context *ctx )
+{
+   __DRIscreenPrivate *sPriv = ctx->sPriv;
+   __DRIcontextPrivate *cPriv = ctx->cPriv;
+
+   assert(ctx->locked);
+   ctx->locked = FALSE;
+
+   DRM_UNLOCK(sPriv->fd, 
+              (drmLock *) &sPriv->pSAREA->lock,
+              cPriv->hHWContext);
+
+   pipe_mutex_unlock(lockMutex);
+}