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authorThomas Hellstrom <thomas-at-tungstengraphics-dot-com>2006-09-05 19:36:45 +0200
committerThomas Hellstrom <thomas-at-tungstengraphics-dot-com>2006-09-05 19:36:45 +0200
commite3f54ecdd9d266607afd7d8b62960b2154b63e9d (patch)
tree54697b5de7468b353e12d6c812b34e0dcb0f772a /libdrm/xf86mm.h
parent604215396847a7964fd7d68aa89d4f778b3bf22b (diff)
Multithreaded application note.
Diffstat (limited to 'libdrm/xf86mm.h')
-rw-r--r--libdrm/xf86mm.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/libdrm/xf86mm.h b/libdrm/xf86mm.h
index 623f4d58..43ea71b8 100644
--- a/libdrm/xf86mm.h
+++ b/libdrm/xf86mm.h
@@ -32,6 +32,18 @@
#include "drm.h"
/*
+ * Note on multithreaded applications using this interface.
+ * Libdrm is not threadsafe, so common buffer, TTM, and fence objects need to
+ * be protected using an external mutex.
+ *
+ * Note: Don't protect the following functions, as it may lead to deadlocks:
+ * drmBOUnmap(), drmFenceBuffers().
+ * The kernel is synchronizing and refcounting buffer maps.
+ * User space only needs to refcount object usage within the same application.
+ */
+
+
+/*
* List macros heavily inspired by the Linux kernel
* list handling. No list looping yet.
*/
@@ -82,6 +94,7 @@ typedef struct _drmMMListHead
((__type *)(((char *) (__item)) - offsetof(__type, __field)))
+
typedef struct _drmBO{
drm_bo_type_t type;
unsigned handle;