research.m1stereo.tv/gitweb/ - melted/blob - src/modules/jackrack/lock_free_fifo.h

   1 /*
   2  *   JACK Rack
   3  *
   4  *   Copyright (C) Robert Ham 2002, 2003 (node@users.sourceforge.net)
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #ifndef __JLH_LOCK_FREE_FIFO_H__
  22 #define __JLH_LOCK_FREE_FIFO_H__
  23
  24 /** lock free fifo ring buffer structure */
  25 typedef struct lock_free_fifo {
  26   /** Size of the ringbuffer (in elements) */
  27   unsigned int size;
  28   /** the memory containing the ringbuffer */
  29   void * data;
  30   /** the size of an element */
  31   size_t object_size;
  32   /** the current position of the reader */
  33   unsigned int read_index;
  34   /** the current position of the writer */
  35   unsigned int write_index;
  36 } lff_t;
  37
  38 void lff_init (lff_t * lff, unsigned int size, size_t object_size);
  39 void lff_free (lff_t * lff);
  40
  41 lff_t * lff_new     (unsigned int size, size_t object_size);
  42 void    lff_destroy (lff_t * lock_free_fifo);
  43
  44 int lff_read (lff_t * lock_free_fifo, void * data);
  45 int lff_write (lff_t * lock_free_fifo, void * data);
  46
  47
  48 #endif /* __JLH_LOCK_FREE_FIFO_H__ */