Clarify format BLOB locking
Bug: 162571907
Test: n/a doc only change
Change-Id: I3ab26cee8a790067447781e13062c62fc3b7c01c
diff --git a/graphics/mapper/stable-c/include/android/hardware/graphics/mapper/IMapper.h b/graphics/mapper/stable-c/include/android/hardware/graphics/mapper/IMapper.h
index 0f6d146..0de88cd 100644
--- a/graphics/mapper/stable-c/include/android/hardware/graphics/mapper/IMapper.h
+++ b/graphics/mapper/stable-c/include/android/hardware/graphics/mapper/IMapper.h
@@ -241,7 +241,9 @@
* acceptable.
*
* 1D buffers (width = size in bytes, height = 1, pixel_format = BLOB) must
- * "lock in place". The buffers must be directly accessible via mapping.
+ * "lock in place" and behave similar to shared memory. That is, multiple threads or processes
+ * may lock the buffer for reading & writing and the results must follow the device's memory
+ * model.
*
* The client must not modify the content of the buffer outside of
* @p accessRegion, and the device need not guarantee that content outside