ogg2/src/mutex.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE Ogg Reference Library SOURCE CODE.      *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE Ogg Reference Library SOURCE CODE IS (C) COPYRIGHT 1994-2004 *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: #ifdef jail for basic thread mutexing
  14  last mod: $Id$
  15
  16  ********************************************************************/
  17
  18 /* the thread mutexing here is for internal Ogg use only; the
  19    zero-copy code in libogg2 centralizes buffer management in one
  20    place where libogg1 spreads it across abstraction layers.
  21
  22    Mutexing code isn't requird for a platform, it's only required to
  23    use threads with libogg and oggfile. */
  24
  25 #ifndef _OGG2_MUTEX_H_
  26 #define _OGG2_MUTEX_H_
  27
  28 #ifdef USE_POSIX_THREADS
  29 #define _REENTRANT 1
  30 #include <pthread.h>
  31 typedef pthread_mutex_t ogg2_mutex_t;
  32 #define ogg2_mutex_init(m) (pthread_mutex_init((m),NULL))
  33 #define ogg2_mutex_clear(m) (pthread_mutex_destroy(m))
  34 #define ogg2_mutex_lock(m) (pthread_mutex_lock(m))
  35 #define ogg2_mutex_unlock(m) (pthread_mutex_unlock(m))
  36
  37 #elif USE_NO_THREADS
  38 typedef int ogg2_mutex_t;
  39 #define noop() do {} while(0)
  40 #define ogg2_mutex_init(m) noop()
  41 #define ogg2_mutex_clear(m) noop()
  42 #define ogg2_mutex_lock(m) noop()
  43 #define ogg2_mutex_unlock(m) noop()
  44
  45 #else
  46 #error "configure proper threading wrappers for this platform, or compile with -DUSE_NO_THREADS to build without threading support."
  47
  48 #endif
  49
  50 #endif /*_OGG2_MUTEX_H_*/