ApplePlatformRunnableThread.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================================
    ApplePlatformRunnableThread.h: Apple platform threading functions
==============================================================================================*/
 
#pragma once
 
#include "Runtime/Core/Private/HAL/PThreadRunnableThread.h"
 
class FRunnableThreadApple : public FRunnableThreadPThread
{
public:
    FRunnableThreadApple()
    :   Pool(NULL)
    {
    }
 
    ~FRunnableThreadApple()
    {
        // Call the parent destructor body before the parent does it - see comment on that function for explanation why.
        FRunnableThreadPThread_DestructorBody();
    }
 
private:
    virtual void PreRun() override
    {
        //@todo - zombie - This and the following build somehow. It makes no sense to me. -astarkey
        Pool = FPlatformMisc::CreateAutoreleasePool();
        pthread_setname_np(TCHAR_TO_ANSI(*ThreadName));
    }
 
    virtual void PostRun() override
    {
        FPlatformMisc::ReleaseAutoreleasePool(Pool);
    }
    
    virtual int GetDefaultStackSize() override
    {
        // default is 512 KB, we need more
        return FPlatformMisc::GetDefaultStackSize();
    }
    
    virtual uint32 AdjustStackSize(uint32 InStackSize) override
    {
        InStackSize = FRunnableThreadPThread::AdjustStackSize(InStackSize);
        
        // If it's set, make sure it's at least 128 KB or stack allocations (e.g. in Logf) may fail
        if (InStackSize < GetDefaultStackSize())
        {
            InStackSize = GetDefaultStackSize();
        }
        
        return InStackSize;
    }
    
    virtual int32 TranslateThreadPriority(EThreadPriority Priority) override
    {
        // these are some default priorities
        switch (Priority)
        {
            // 0 is the lowest, 47 is the high priority for Apple
            case TPri_TimeCritical: return 47;
            case TPri_Highest:  return 45;
            case TPri_AboveNormal: return 37;
            case TPri_Normal: return 31;
            case TPri_SlightlyBelowNormal: return 30;
            case TPri_BelowNormal: return 25;
            case TPri_Lowest: return 20;
            case TPri_Num:
            default: UE_LOG(LogHAL, Fatal, TEXT("Unknown Priority passed to FRunnableThreadApple::TranslateThreadPriority()")); return 31;
        }
    }
    
    void*      Pool;
};