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block and wait for a sync object to become signaled

function glClientWaitSync(int $sync, int $flags, int $timeout) : int
  1. int $sync The sync object whose status to wait on.
  2. int $flags A bitfield controlling the command flushing behavior. flags may be GL_SYNC_FLUSH_COMMANDS_BIT.
  3. int $timeout The timeout, specified in nanoseconds, for which the implementation should wait for sync to become signaled.


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