Engine/lib/bullet/src/BulletMultiThreaded/SpuSync.h

   1 /*
   2 Bullet Continuous Collision Detection and Physics Library
   3 Copyright (c) 2007 Starbreeze Studios
   4
   5 This software is provided 'as-is', without any express or implied warranty.
   6 In no event will the authors be held liable for any damages arising from the use of this software.
   7 Permission is granted to anyone to use this software for any purpose,
   8 including commercial applications, and to alter it and redistribute it freely,
   9 subject to the following restrictions:
  10
  11 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
  12 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
  13 3. This notice may not be removed or altered from any source distribution.
  14
  15 Written by: Marten Svanfeldt
  16 */
  17
  18 #ifndef BT_SPU_SYNC_H
  19 #define BT_SPU_SYNC_H
  20
  21
  22 #include "PlatformDefinitions.h"
  23
  24
  25 #if defined(WIN32)
  26
  27 #define WIN32_LEAN_AND_MEAN
  28 #ifdef _XBOX
  29 #include <Xtl.h>
  30 #else
  31 #include <Windows.h>
  32 #endif
  33
  34 ///The btSpinlock is a structure to allow multi-platform synchronization. This allows to port the SPU tasks to other platforms.
  35 class btSpinlock
  36 {
  37 public:
  38         //typedef volatile LONG SpinVariable;
  39         typedef CRITICAL_SECTION SpinVariable;
  40
  41         btSpinlock (SpinVariable* var)
  42                 : spinVariable (var)
  43         {}
  44
  45         void Init ()
  46         {
  47                 //*spinVariable = 0;
  48                 InitializeCriticalSection(spinVariable);
  49         }
  50
  51         void Lock ()
  52         {
  53                 EnterCriticalSection(spinVariable);
  54         }
  55
  56         void Unlock ()
  57         {
  58                 LeaveCriticalSection(spinVariable);
  59         }
  60
  61 private:
  62         SpinVariable* spinVariable;
  63 };
  64
  65
  66 #elif defined (__CELLOS_LV2__)
  67
  68 //#include <cell/atomic.h>
  69 #include <cell/sync/mutex.h>
  70
  71 ///The btSpinlock is a structure to allow multi-platform synchronization. This allows to port the SPU tasks to other platforms.
  72 class btSpinlock
  73 {
  74 public:
  75         typedef CellSyncMutex SpinVariable;
  76
  77         btSpinlock (SpinVariable* var)
  78                 : spinVariable (var)
  79         {}
  80
  81         void Init ()
  82         {
  83 #ifndef __SPU__
  84                 //*spinVariable = 1;
  85                 cellSyncMutexInitialize(spinVariable);
  86 #endif
  87         }
  88
  89
  90
  91         void Lock ()
  92         {
  93 #ifdef __SPU__
  94                 // lock semaphore
  95                 /*while (cellAtomicTestAndDecr32(atomic_buf, (uint64_t)spinVariable) == 0)
  96                 {
  97
  98                 };*/
  99                 cellSyncMutexLock((uint64_t)spinVariable);
 100 #endif
 101         }
 102
 103         void Unlock ()
 104         {
 105 #ifdef __SPU__
 106                 //cellAtomicIncr32(atomic_buf, (uint64_t)spinVariable);
 107                 cellSyncMutexUnlock((uint64_t)spinVariable);
 108 #endif
 109         }
 110
 111
 112 private:
 113         SpinVariable*   spinVariable;
 114         ATTRIBUTE_ALIGNED128(uint32_t           atomic_buf[32]);
 115 };
 116
 117 #else
 118 //create a dummy implementation (without any locking) useful for serial processing
 119 class btSpinlock
 120 {
 121 public:
 122         typedef int  SpinVariable;
 123
 124         btSpinlock (SpinVariable* var)
 125                 : spinVariable (var)
 126         {}
 127
 128         void Init ()
 129         {
 130         }
 131
 132         void Lock ()
 133         {
 134         }
 135
 136         void Unlock ()
 137         {
 138         }
 139
 140 private:
 141         SpinVariable* spinVariable;
 142 };
 143
 144
 145 #endif
 146
 147
 148 #endif //BT_SPU_SYNC_H
 149