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/*** |
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*_vcclrit.h |
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* |
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* Copyright (c) Microsoft Corporation. All rights reserved. |
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* |
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*Purpose: |
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* This file defined the functions and variables used by users |
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* to initialize the CRT and the dll in IJW scenarios. It is no longer |
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* necessary to use this file and the functions it contains because |
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* CRT initialization no longer causes managed code to execute |
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* under the loader lock. It is now possible to use the CRT in |
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* the standard way without problems. This header is shipped for |
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* compatibility with the previous version only. |
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* |
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****/ |
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#pragma once |
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#ifndef __midl |
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#ifndef _MSC_EXTENSIONS |
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#error ERROR: This initialisation code cannot be used with /Za |
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#endif |
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#ifdef _M_CEE_PURE |
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#error ERROR: This code is not useful for /clr:pure mode. Remove the include. |
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#endif |
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#include <crtwrn.h> |
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#include <windows.h> |
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#if !defined(_CRT_VCCLRIT_NO_DEPRECATE) |
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#define _CRT_VCCLRIT_DEPRECATE _CRT_DEPRECATE_TEXT("These manual initialisation functions (plus link /noentry) are no longer appropriate for managed code DLLs. Instead, use a normal DLL entrypoint. See online help for more information.") |
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#pragma _CRT_WARNING( _VCCLRIT_DEPRECATED ) |
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#else |
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#define _CRT_VCCLRIT_DEPRECATE |
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#endif |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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extern IMAGE_DOS_HEADER __ImageBase; |
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BOOL WINAPI _DllMainCRTStartup( |
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HANDLE _HDllHandle, |
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DWORD _DwReason, |
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LPVOID _Lpreserved |
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); |
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typedef enum { |
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__uninitialized, |
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__initializing, |
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__NSinitialized /* Renamed */ |
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} __enative_startup_state; |
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extern __enative_startup_state __native_startup_state; |
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extern void *__native_startup_lock; |
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extern volatile unsigned int __native_vcclrit_reason; |
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#define __NO_REASON 0xffffffff /* maximum unsigned int value */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#ifdef __cplusplus |
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#define __USE_GLOBAL_NAMESPACE(X) (::X) |
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#define __THROW throw() |
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#define __REINTERPRET_CAST(T) reinterpret_cast<T> |
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#define __STATIC_CAST(T) static_cast<T> |
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#define __INLINE inline |
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#else |
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/* deliberately no parens here so we don't suppress macro expansion */ |
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#define __USE_GLOBAL_NAMESPACE(X) X |
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#define __THROW |
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#define __REINTERPRET_CAST(T) (T) |
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#define __STATIC_CAST(T) (T) |
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#define __INLINE __inline |
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#endif |
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#ifdef _M_IX86 |
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/* System version has problems especially for /Wp64 */ |
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__INLINE void* WINAPI _CrtInterlockedExchangePointer(void** pp, void* pNew) __THROW |
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{ |
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return( __REINTERPRET_CAST(void*)(__STATIC_CAST(LONG_PTR)(__USE_GLOBAL_NAMESPACE(InterlockedExchange)(__REINTERPRET_CAST(LONG*)(pp), __STATIC_CAST(LONG)(__REINTERPRET_CAST(LONG_PTR)(pNew))))) ); |
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} |
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#else |
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#define _CrtInterlockedExchangePointer(p, n) InterlockedExchangePointer(p, n) |
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#endif |
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/* |
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Used to lock |
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*/ |
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_CRT_VCCLRIT_DEPRECATE |
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__declspec( selectany ) LONG volatile __lock_handle = 0; |
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/* |
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Init called |
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*/ |
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_CRT_VCCLRIT_DEPRECATE |
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__declspec(selectany) BOOL volatile __initialized = FALSE; |
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/* |
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Term called |
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*/ |
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_CRT_VCCLRIT_DEPRECATE |
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__declspec( selectany ) BOOL volatile __terminated = FALSE; |
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_CRT_VCCLRIT_DEPRECATE |
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__inline BOOL WINAPI __crt_dll_initialize() |
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{ |
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/* |
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Try to make the variable names unique, so that the variables don't even clash with macros. |
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*/ |
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static BOOL volatile (__retval) = FALSE; |
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static void * volatile (__lockFiberId) = 0; |
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void * volatile (__currentFiberId) = ((PNT_TIB)__USE_GLOBAL_NAMESPACE(NtCurrentTeb)())->StackBase; |
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int (__int_var)=0; |
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int __nested=FALSE; |
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/* |
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Take Lock, This is needed for multithreaded scenario. Moreover the threads |
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need to wait here to make sure that the dll is initialized when they get |
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past this function. |
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*/ |
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while ( __USE_GLOBAL_NAMESPACE(InterlockedExchange)( &(__lock_handle), 1) == 1 ) |
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{ |
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++(__int_var); |
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if ((__lockFiberId) == (__currentFiberId)) |
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{ |
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return TRUE; |
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} |
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__USE_GLOBAL_NAMESPACE(Sleep)( (__int_var)>1000?100:0 ); |
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/* |
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If you hang in this loop, this implies that your dllMainCRTStartup is hung on another |
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thread. The most likely cause of this is a hang in one of your static constructors or |
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destructors. |
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*/ |
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} |
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/* |
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Note that we don't really need any interlocked stuff here as the writes are always |
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in the lock. Only reads are outside the lock. |
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*/ |
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(__lockFiberId) = (__currentFiberId); |
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__try { |
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void * __lock_free=0; |
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while((__lock_free=InterlockedCompareExchangePointer(&__native_startup_lock, __currentFiberId, 0))!=0) |
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{ |
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if(__lock_free==__currentFiberId) |
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{ |
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__nested=TRUE; |
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break; |
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} |
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/* some other thread is running native startup/shutdown during a cctor/domain unload. |
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Should only happen if this DLL was built using the Everett-compat loader lock fix in vcclrit.h |
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*/ |
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/* wait for the other thread to complete init before we return */ |
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Sleep(1000); |
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} |
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if ( (__terminated) == TRUE ) |
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{ |
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(__retval) = FALSE; |
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} |
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else if ( (__initialized) == FALSE ) |
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{ |
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/* cctor may have initialized native code already */ |
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if (__native_startup_state == __uninitialized) |
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(__initialized) = TRUE; |
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} |
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} |
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} __finally { |
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/* revert the __lockFiberId */ |
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(__lockFiberId) = 0; |
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/* Release Lock */ |
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__USE_GLOBAL_NAMESPACE(InterlockedExchange)( &(__lock_handle), 0 ); |
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if(!__nested) |
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{ |
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_CrtInterlockedExchangePointer( &(__native_startup_lock), 0 ); |
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} |
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} |
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return (__retval); |
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} |
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_CRT_VCCLRIT_DEPRECATE |
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__inline BOOL WINAPI __crt_dll_terminate() |
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{ |
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static BOOL volatile (__retval) = TRUE; |
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static void * volatile (__lockFiberId) = 0; |
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void * volatile (__currentFiberId) = ((PNT_TIB)__USE_GLOBAL_NAMESPACE(NtCurrentTeb)())->StackBase; |
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int (__int_var)=0; |
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int __nested=FALSE; |
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/* Take Lock, this lock is needed to keep Terminate in sync with Initialize. */ |
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while ( __USE_GLOBAL_NAMESPACE(InterlockedExchange)( &(__lock_handle), 1) == 1 ) |
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{ |
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++(__int_var); |
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if ((__lockFiberId) == (__currentFiberId)) |
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{ |
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return TRUE; |
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} |
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__USE_GLOBAL_NAMESPACE(Sleep)( (__int_var)>1000?100:0 ); |
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/* |
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If you hang in this loop, this implies that your dllMainCRTStartup is hung on another |
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thread. The most likely cause of this is a hang in one of your static constructors or |
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destructors. |
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*/ |
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} |
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/* |
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Note that we don't really need any interlocked stuff here as the writes are always |
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in the lock. Only reads are outside the lock. |
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*/ |
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(__lockFiberId) = (__currentFiberId); |
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__try { |
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void *__lock_free=0; |
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while((__lock_free=__USE_GLOBAL_NAMESPACE(InterlockedCompareExchangePointer)(&__native_startup_lock, __REINTERPRET_CAST(void *)(__STATIC_CAST(INT_PTR)(1)), 0))!=0) |
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{ |
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/* some other thread is running native startup/shutdown during a cctor/domain unload. |
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Should only happen if this DLL was built using the Everett-compat loader lock fix in vcclrit.h |
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*/ |
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/* wait for the other thread to complete init before we return */ |
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Sleep(1000); |
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} |
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if ( (__initialized) == FALSE ) |
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{ |
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(__retval) = FALSE; |
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} |
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else if ( (__terminated) == FALSE ) |
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{ |
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__try |
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{ |
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__native_vcclrit_reason = DLL_PROCESS_DETACH; |
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(__retval) = _DllMainCRTStartup( ( HINSTANCE )( &(__ImageBase) ), DLL_PROCESS_DETACH, 0 ); |
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} |
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__finally |
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{ |
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__native_vcclrit_reason = __NO_REASON; |
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} |
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(__terminated) = TRUE; |
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} |
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} __finally { |
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/* revert the __lockFiberId */ |
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(__lockFiberId) = 0; |
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/* Release Lock */ |
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__USE_GLOBAL_NAMESPACE(InterlockedExchange)( &(__lock_handle), 0 ); |
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if(!__nested) |
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{ |
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_CrtInterlockedExchangePointer( &(__native_startup_lock), 0 ); |
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} |
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} |
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return (__retval); |
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} |
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#endif |
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