comedi_mark_buffer_written — streaming buffer control
#include <comedilib.h>
int comedi_mark_buffer_written( | comedi_t * device, |
| unsigned int subdevice, | |
unsigned int num_bytes); |
The function comedi_mark_buffer_written is used on a subdevice
that has a Comedi output command in progress. It should only be used
if you are using a mmap mapping to write data to Comedi's buffer
(as opposed to calling write on the device
file descriptor), since Comedi
will automatically keep track of how many bytes have been
transferred via write calls. This function is
used to indicate that the next num_bytes
bytes in the buffer
are valid and may be sent to the device.