source/common/winxp.h

   1 /*****************************************************************************
   2  * Copyright (C) 2013 x265 project
   3  *
   4  * Authors: Steve Borho <steve@borho.org>
   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., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19  *
  20  * This program is also available under a commercial proprietary license.
  21  * For more information, contact us at license @ x265.com
  22  *****************************************************************************/
  23
  24 #ifndef X265_WINXP_H
  25 #define X265_WINXP_H
  26
  27 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA
  28
  29 #ifdef _MSC_VER
  30 #include <intrin.h> // _InterlockedCompareExchange64
  31 #endif
  32
  33 namespace x265 {
  34 /* non-native condition variable */
  35 typedef struct
  36 {
  37     CRITICAL_SECTION broadcastMutex;
  38     CRITICAL_SECTION waiterCountMutex;
  39     HANDLE semaphore;
  40     HANDLE waitersDone;
  41     volatile int waiterCount;
  42     volatile int bIsBroadcast;
  43 } ConditionVariable;
  44
  45 int WINAPI cond_init(ConditionVariable *cond);
  46 void WINAPI cond_broadcast(ConditionVariable *cond);
  47 void WINAPI cond_signal(ConditionVariable *cond);
  48 BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait);
  49 void cond_destroy(ConditionVariable *cond);
  50
  51 /* map missing API symbols to our structure and functions */
  52 #define CONDITION_VARIABLE          x265::ConditionVariable
  53 #define InitializeConditionVariable x265::cond_init
  54 #define SleepConditionVariableCS    x265::cond_wait
  55 #define WakeConditionVariable       x265::cond_signal
  56 #define WakeAllConditionVariable    x265::cond_broadcast
  57 #define XP_CONDITION_VAR_FREE       x265::cond_destroy
  58
  59 #if defined(_MSC_VER)
  60
  61 /* Windows XP did not define atomic OR 64, but gcc has a good version, so
  62  * only use this workaround when targeting XP with MSVC */
  63 FORCEINLINE LONGLONG interlocked_OR64(__inout LONGLONG volatile *Destination,
  64                                       __in    LONGLONG           Value)
  65 {
  66     LONGLONG Old;
  67
  68     do
  69     {
  70         Old = *Destination;
  71     }
  72     while (_InterlockedCompareExchange64(Destination, Old | Value, Old) != Old);
  73
  74     return Old;
  75 }
  76
  77 #define ATOMIC_OR(ptr, mask) x265::interlocked_OR64((volatile LONG64*)ptr, mask)
  78
  79 #if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
  80 #pragma intrinsic(_InterlockedCompareExchange64)
  81 #endif
  82 #endif // defined(_MSC_VER)
  83 } // namespace x265
  84
  85 #else // if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
  86
  87 #define XP_CONDITION_VAR_FREE(x)
  88
  89 #endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP
  90
  91 #endif // ifndef X265_WINXP_H