drivers/staging/iio/ring_sw.h

   1 /* The industrial I/O simple minimally locked ring buffer.
   2  *
   3  * Copyright (c) 2008 Jonathan Cameron
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This code is deliberately kept separate from the main industrialio I/O core
  10  * as it is intended that in the future a number of different software ring
  11  * buffer implementations will exist with different characteristics to suit
  12  * different applications.
  13  *
  14  * This particular one was designed for a data capture application where it was
  15  * particularly important that no userspace reads would interrupt the capture
  16  * process. To this end the ring is not locked during a read.
  17  *
  18  * Comments on this buffer design welcomed. It's far from efficient and some of
  19  * my understanding of the effects of scheduling on this are somewhat limited.
  20  * Frankly, to my mind, this is the current weak point in the industrial I/O
  21  * patch set.
  22  */
  23
  24 #ifndef _IIO_RING_SW_H_
  25 #define _IIO_RING_SW_H_
  26 #include "buffer_generic.h"
  27
  28 /**
  29  * ring_sw_access_funcs - access functions for a software ring buffer
  30  **/
  31 extern const struct iio_buffer_access_funcs ring_sw_access_funcs;
  32
  33 struct iio_buffer *iio_sw_rb_allocate(struct iio_dev *indio_dev);
  34 void iio_sw_rb_free(struct iio_buffer *ring);
  35 #endif /* _IIO_RING_SW_H_ */