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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zenbase/zenbase.h>
/**
* It should be possible to provide a generic implementation as long as a threadID is provided. We don't do that yet.
*/
struct FGenericPlatformTLS
{
static const uint32_t InvalidTlsSlot = 0xFFFFFFFF;
/**
* Return false if this is an invalid TLS slot
* @param SlotIndex the TLS index to check
* @return true if this looks like a valid slot
*/
static bool IsValidTlsSlot(uint32_t SlotIndex) { return SlotIndex != InvalidTlsSlot; }
};
#if ZEN_PLATFORM_WINDOWS
# include <zencore/windows.h>
class FWindowsPlatformTLS : public FGenericPlatformTLS
{
public:
static uint32_t AllocTlsSlot() { return ::TlsAlloc(); }
static void FreeTlsSlot(uint32_t SlotIndex) { ::TlsFree(SlotIndex); }
static void SetTlsValue(uint32_t SlotIndex, void* Value) { ::TlsSetValue(SlotIndex, Value); }
/**
* Reads the value stored at the specified TLS slot
*
* @return the value stored in the slot
*/
static void* GetTlsValue(uint32_t SlotIndex) { return ::TlsGetValue(SlotIndex); }
/**
* Return false if this is an invalid TLS slot
* @param SlotIndex the TLS index to check
* @return true if this looks like a valid slot
*/
static bool IsValidTlsSlot(uint32_t SlotIndex) { return SlotIndex != InvalidTlsSlot; }
};
typedef FWindowsPlatformTLS FPlatformTLS;
#elif ZEN_PLATFORM_MAC
# include <pthread.h
/**
* Apple implementation of the TLS OS functions
**/
struct FApplePlatformTLS : public FGenericPlatformTLS
{
/**
* Returns the currently executing thread's id
*/
static uint32_t GetCurrentThreadId(void) { return (uint32_t)pthread_mach_thread_np(pthread_self()); }
/**
* Allocates a thread local store slot
*/
static uint32_t 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;
}
/**
* Sets a value in the specified TLS slot
*
* @param SlotIndex the TLS index to store it in
* @param Value the value to store in the slot
*/
static void SetTlsValue(uint32_t SlotIndex, void* Value) { pthread_setspecific((pthread_key_t)SlotIndex, Value); }
/**
* Reads the value stored at the specified TLS slot
*
* @return the value stored in the slot
*/
static void* GetTlsValue(uint32_t SlotIndex) { return pthread_getspecific((pthread_key_t)SlotIndex); }
/**
* Frees a previously allocated TLS slot
*
* @param SlotIndex the TLS index to store it in
*/
static void FreeTlsSlot(uint32_t SlotIndex) { pthread_key_delete((pthread_key_t)SlotIndex); }
};
typedef FApplePlatformTLS FPlatformTLS;
#else
# error Platform not yet supported
#endif
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