5. The system of claim 4 , wherein the GPU releases a semaphore by executing a release semaphore command in the first push buffer of commands.
5. The system of claim 4 , wherein the GPU releases a semaphore by executing a release semaphore command in the first push buffer of commands. 6. The system of claim 5 , wherein the GPU acquires the semaphore by executing an acquire semaphore command in the second push buffer of commands.