src/mesa/drivers/dri/radeon/radeon_lock.h

   1 /* $XFree86: xc/lib/GL/mesa/src/drv/radeon/radeon_lock.h,v 1.3 2002/10/30 12:51:55 alanh Exp $ */
   2 /**************************************************************************
   3
   4 Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
   5                      VA Linux Systems Inc., Fremont, California.
   6
   7 All Rights Reserved.
   8
   9 Permission is hereby granted, free of charge, to any person obtaining
  10 a copy of this software and associated documentation files (the
  11 "Software"), to deal in the Software without restriction, including
  12 without limitation the rights to use, copy, modify, merge, publish,
  13 distribute, sublicense, and/or sell copies of the Software, and to
  14 permit persons to whom the Software is furnished to do so, subject to
  15 the following conditions:
  16
  17 The above copyright notice and this permission notice (including the
  18 next paragraph) shall be included in all copies or substantial
  19 portions of the Software.
  20
  21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  24 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  25 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28
  29 **************************************************************************/
  30
  31 /*
  32  * Authors:
  33  *   Kevin E. Martin <martin@valinux.com>
  34  *   Gareth Hughes <gareth@valinux.com>
  35  */
  36
  37 #ifndef __RADEON_LOCK_H__
  38 #define __RADEON_LOCK_H__
  39
  40 #ifdef GLX_DIRECT_RENDERING
  41
  42 extern void radeonGetLock( radeonContextPtr rmesa, GLuint flags );
  43
  44 /* Turn DEBUG_LOCKING on to find locking conflicts.
  45  */
  46 #define DEBUG_LOCKING   0
  47
  48 #if DEBUG_LOCKING
  49 extern char *prevLockFile;
  50 extern int prevLockLine;
  51
  52 #define DEBUG_LOCK()                                                    \
  53    do {                                                                 \
  54       prevLockFile = (__FILE__);                                        \
  55       prevLockLine = (__LINE__);                                        \
  56    } while (0)
  57
  58 #define DEBUG_RESET()                                                   \
  59    do {                                                                 \
  60       prevLockFile = 0;                                                 \
  61       prevLockLine = 0;                                                 \
  62    } while (0)
  63
  64 #define DEBUG_CHECK_LOCK()                                              \
  65    do {                                                                 \
  66       if ( prevLockFile ) {                                             \
  67          fprintf( stderr,                                               \
  68                   "LOCK SET!\n\tPrevious %s:%d\n\tCurrent: %s:%d\n",    \
  69                   prevLockFile, prevLockLine, __FILE__, __LINE__ );     \
  70          exit( 1 );                                                     \
  71       }                                                                 \
  72    } while (0)
  73
  74 #else
  75
  76 #define DEBUG_LOCK()
  77 #define DEBUG_RESET()
  78 #define DEBUG_CHECK_LOCK()
  79
  80 #endif
  81
  82 /*
  83  * !!! We may want to separate locks from locks with validation.  This
  84  * could be used to improve performance for those things commands that
  85  * do not do any drawing !!!
  86  */
  87
  88
  89 /* Lock the hardware and validate our state.
  90  */
  91 #define LOCK_HARDWARE( rmesa )                                  \
  92    do {                                                         \
  93       char __ret = 0;                                           \
  94       DEBUG_CHECK_LOCK();                                       \
  95       DRM_CAS( rmesa->dri.hwLock, rmesa->dri.hwContext,         \
  96                (DRM_LOCK_HELD | rmesa->dri.hwContext), __ret ); \
  97       if ( __ret )                                              \
  98          radeonGetLock( rmesa, 0 );                             \
  99       DEBUG_LOCK();                                             \
 100    } while (0)
 101
 102 /* Unlock the hardware.  We must assume that state has been lost when we unlock,
 103  * because when we next grab the lock (to emit an accumulated cmdbuf), we don't
 104  * have the information to recreate the context state as of the last unlock in
 105  * in the case that we did lose the context state.
 106  *
 107  * The alternative to this would be to copy out the state on unlock
 108  * (approximately) and if we did lose the context, dispatch a cmdbuf to reset
 109  * the state to that old copy before continuing with the accumulated command
 110  * buffer.
 111  */
 112 #define UNLOCK_HARDWARE( rmesa )                                        \
 113    do {                                                                 \
 114       DRM_UNLOCK( rmesa->dri.fd,                                        \
 115                   rmesa->dri.hwLock,                                    \
 116                   rmesa->dri.hwContext );                               \
 117       DEBUG_RESET();                                                    \
 118       rmesa->lost_context = GL_TRUE;                                    \
 119    } while (0)
 120
 121 #endif
 122 #endif /* __RADEON_LOCK_H__ */