_xbox_g_c_2_ak_platform_funcs_8h

Wwise SDK 2023.1.3

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 released in source code form as part of the SDK installer package.
  
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 "Apache License"); you may not use this file except in compliance with the 
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 #pragma once
  
 #include <AK/Tools/Win32/AkPlatformFuncs.h>
  
 namespace AKPLATFORM
 {
  
     // --------------------------------------------------------------------
     // Custom definition for AkLimitedSpin functions
 #if defined(AK_XBOXSERIESX) // monitorx/waitx is not available on XB1 hardware, only XSX
  
     // Waits for a limited amount of time for in_pVal to hit zero (without yielding the thread)
     inline void AkLimitedSpinForZero(AkAtomic32* in_pVal)
     {
         // monitorx and waitx are available on certain AMD CPUs, so we can have a custom impl of AkLimitedSpinForZero
         AkInt64 endSpinTime = 0;
         AkInt64 currentTime = 0;
         PerformanceCounter(&endSpinTime);
         endSpinTime += AkInt64(AK::g_fFreqRatio * 0.01); // only spin for about 10us
         while (true)
         {
             // set up monitorx on pVal
             _mm_monitorx((void*)in_pVal, 0U, 0U);
             // if pval is zero, skip out
             if (AkAtomicLoad32(in_pVal) == 0)
             {
                 break;
             }
             // wait until a store to pVal occurs (or ~1us passes)
             _mm_mwaitx(2U, 0U, 1000U);
  
             // Check if we've hit the deadline for the timeout
             PerformanceCounter(&currentTime);
             if (currentTime > endSpinTime)
             {
                 break;
             }
         }
     }
  
     // Waits for a limited amount of time for in_pVal to get atomically shift from the expected value to the proposed one
     // returns true if acquisition succeeded
     inline bool AkLimitedSpinToAcquire(AkAtomic32* in_pVal, AkInt32 in_proposed, AkInt32 in_expected)
     {
         if (AkAtomicCas32(in_pVal, in_proposed, in_expected))
         {
             return true;
         }
  
         // Cas failed, start the slower evaluation
  
         // monitorx and waitx are available on certain AMD CPUs, so we can use monitorx/waitx
         AkInt64 endSpinTime = 0;
         AkInt64 currentTime = 0;
         PerformanceCounter(&endSpinTime);
         endSpinTime += AkInt64(AK::g_fFreqRatio * 0.01); // only spin for about 10us
         while (true)
         {
             // set up monitorx on pVal
             _mm_monitorx((void*)in_pVal, 0U, 0U);
             // attempt cas to acquire and if successful, skip out
             if (AkAtomicCas32(in_pVal, in_proposed, in_expected))
             {
                 return true;
             }
             // wait until a store to pVal occurs (or ~1us passes)
             _mm_mwaitx(2U, 0U, 1000U);
  
             // Check if we've hit the deadline for the timeout
             PerformanceCounter(&currentTime);
             if (currentTime > endSpinTime)
             {
                 return false;
             }
         }
     }
  
 #define AK_LIMITEDSPINFORZERO // mark AkLimitedSpinForZero as defined to avoid duplicate definitions
 #endif // defined(AK_XBOXSERIESX)
 }