ApplePlatformTLS.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================================
    ApplePlatformTLS.h: Apple platform TLS (Thread local storage and thread ID) functions
==============================================================================================*/
 
#pragma once
#include "GenericPlatform/GenericPlatformTLS.h"
#include "CoreTypes.h"
#if PLATFORM_MAC
#include "Mac/MacSystemIncludes.h"
#elif PLATFORM_IOS
#include "IOS/IOSSystemIncludes.h"
#endif
 
struct CORE_API FApplePlatformTLS : public FGenericPlatformTLS
{
    static UE_FORCEINLINE_HINT uint32 GetCurrentThreadId(void)
    {
        return (uint32)pthread_mach_thread_np(pthread_self());
    }
 
    static inline uint32 AllocTlsSlot(void)
    {
        // allocate a per-thread mem slot
        pthread_key_t SlotKey = 0;
        if (pthread_key_create(&SlotKey, NULL) != 0)
        {
            SlotKey = InvalidTlsSlot;  // matches the Windows TlsAlloc() retval.
        }
        return SlotKey;
    }
 
    static UE_FORCEINLINE_HINT void SetTlsValue(uint32 SlotIndex,void* Value)
    {
        pthread_setspecific((pthread_key_t)SlotIndex, Value);
    }
 
    static UE_FORCEINLINE_HINT void* GetTlsValue(uint32 SlotIndex)
    {
        return pthread_getspecific((pthread_key_t)SlotIndex);
    }
 
    static UE_FORCEINLINE_HINT void FreeTlsSlot(uint32 SlotIndex)
    {
        pthread_key_delete((pthread_key_t)SlotIndex);
    }
};
 
typedef FApplePlatformTLS FPlatformTLS;