tree 053bebd945bed02d61c8b92aa3b02bf45d37d4a9
parent abe3c9c88f9cd1cbc5d3a3eec4bdbba6e3ce2107
author Jeff Boody <jboody@codeaurora.org> 1335460364 -0600
committer Jeff Boody <jboody@codeaurora.org> 1336507134 -0600

base: genlock: allow synchronization with a single gralloc handle

In order to support synchronization in a process with a single
gralloc handle we require the ability to write lock a buffer
while it is already read locked by the same handle. This change
extends the concept of an exclusive write lock or recursive read
locks to a genlock handle (rather than the genlock lock).
Genlock cannot provide deadlock protection because the same
handle can be used simultaneously by a producer and consumer.
In practice an error will still be generated when the timeout
expires.

CRs-fixed: 356263
Change-Id: I322e7fadc8b43287f53b211242b176d3de731db2
Signed-off-by: Jeff Boody <jboody@codeaurora.org>