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→Genlock
Genlock is implemented in the kernel. The kernel GL driver is able to lock and unlock directly. Typically, it will place a read lock on any gralloc buffer that's bound to a texture it's sampling from, and unlock when it's done with that texture.
A logging patch for genlock that lets you see locking across process is here: [http://people.mozilla.com/~jmuizelaar/genlock-logging-patch]
== How we lock/unlock Gralloc buffers ==
