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

   1 /*
   2  * JACK Rack
   3  *
   4  * Original:
   5  * Copyright (C) Robert Ham 2002, 2003 (node@users.sourceforge.net)
   6  *
   7  * Modification for MLT:
   8  * Copyright (C) 2004 Ushodaya Enterprises Limited
   9  * Author: Dan Dennedy <dan@dennedy.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #ifndef __JLH_LOCK_FREE_FIFO_H__
  27 #define __JLH_LOCK_FREE_FIFO_H__
  28
  29 /** lock free fifo ring buffer structure */
  30 typedef struct lock_free_fifo {
  31   /** Size of the ringbuffer (in elements) */
  32   unsigned int size;
  33   /** the memory containing the ringbuffer */
  34   void * data;
  35   /** the size of an element */
  36   size_t object_size;
  37   /** the current position of the reader */
  38   unsigned int read_index;
  39   /** the current position of the writer */
  40   unsigned int write_index;
  41 } lff_t;
  42
  43 void lff_init (lff_t * lff, unsigned int size, size_t object_size);
  44 void lff_free (lff_t * lff);
  45
  46 lff_t * lff_new     (unsigned int size, size_t object_size);
  47 void    lff_destroy (lff_t * lock_free_fifo);
  48
  49 int lff_read (lff_t * lock_free_fifo, void * data);
  50 int lff_write (lff_t * lock_free_fifo, void * data);
  51
  52
  53 #endif /* __JLH_LOCK_FREE_FIFO_H__ */