1aa4bfe39e
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> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>