comedi_do_insnlist - perform multiple instructions
int comedi_do_insnlist (comedi_t * device, comedi_insnlist * list);
The function comedi_do_insnlist() performs multiple Comedi instructions
as part of one system call. In addition, Comedi attempts to perform
the instructions atomically, that is, on standard Linux kernels, no
process preemption should occur during the instructions. However, the
process may be preempted before or after the group of instructions.
This function can be used to avoid the overhead of multiple system
calls, or to ensure that multiple instructions occur without
significant delay between them.
Preemption may occur if any of the instructions or the data arrays of
any of the instructions exist in non-resident or copy-on-write pages.
The function comedi_do_insnlist() returns the number of sucessfully
completed instructions. Error information for the unsucessful
instruction is not available. If there is an error before the first
instruction can be executed, -1 is returned.
28 October 2007