author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
permissions | -rw-r--r-- |
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/* |
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* |
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* Copyright (c) 1996,1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1997 |
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* Moscow Center for SPARC Technology |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_ALLOC_C |
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#define _STLP_ALLOC_C |
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#ifdef __WATCOMC__ |
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#pragma warning 13 9 |
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#pragma warning 367 9 |
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#pragma warning 368 9 |
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#endif |
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#ifndef _STLP_INTERNAL_ALLOC_H |
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# include <stl/_alloc.h> |
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#endif |
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# if defined (_STLP_EXPOSE_GLOBALS_IMPLEMENTATION) |
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# ifdef _STLP_SGI_THREADS |
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// We test whether threads are in use before locking. |
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// Perhaps this should be moved into stl_threads.h, but that |
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// probably makes it harder to avoid the procedure call when |
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// it isn't needed. |
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extern "C" { |
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extern int __us_rsthread_malloc; |
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} |
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# endif |
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// Specialised debug form of malloc which does not provide "false" |
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// memory leaks when run with debug CRT libraries. |
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#if defined(_STLP_MSVC) && (_STLP_MSVC>=1020 && defined(_STLP_DEBUG_ALLOC)) && ! defined (_STLP_WINCE) |
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# include <crtdbg.h> |
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inline void* __stlp_chunk_malloc(size_t __bytes) { _STLP_CHECK_NULL_ALLOC(_malloc_dbg(__bytes, _CRT_BLOCK, __FILE__, __LINE__)); } |
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#else // !_DEBUG |
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# ifdef _STLP_NODE_ALLOC_USE_MALLOC |
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# include <cstdlib> |
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inline void* __stlp_chunk_malloc(size_t __bytes) { _STLP_CHECK_NULL_ALLOC(_STLP_VENDOR_CSTD::malloc(__bytes)); } |
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# else |
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inline void* __stlp_chunk_malloc(size_t __bytes) { return _STLP_STD::__stl_new(__bytes); } |
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# endif |
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#endif // !_DEBUG |
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#define _S_FREELIST_INDEX(__bytes) ((__bytes-size_t(1))>>(int)_ALIGN_SHIFT) |
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_STLP_BEGIN_NAMESPACE |
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#ifndef _STLP_NO_NODE_ALLOC |
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template <int __inst> |
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void * _STLP_CALL __malloc_alloc<__inst>::_S_oom_malloc(size_t __n) |
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{ |
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__oom_handler_type __my_malloc_handler; |
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void * __result; |
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for (;;) { |
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__my_malloc_handler = __oom_handler; |
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if (0 == __my_malloc_handler) { __THROW_BAD_ALLOC; } |
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(*__my_malloc_handler)(); |
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__result = malloc(__n); |
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if (__result) return(__result); |
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} |
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#if defined(_STLP_NEED_UNREACHABLE_RETURN) |
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return 0; |
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#endif |
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} |
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#endif |
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template <class _Alloc> |
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void * _STLP_CALL __debug_alloc<_Alloc>::allocate(size_t __n) { |
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size_t __real_n = __n + __extra_before_chunk() + __extra_after_chunk(); |
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__alloc_header *__result = (__alloc_header *)__allocator_type::allocate(__real_n); |
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memset((char*)__result, __shred_byte, __real_n*sizeof(value_type)); |
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__result->__magic = __magic; |
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__result->__type_size = sizeof(value_type); |
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__result->_M_size = (_STLP_UINT32_T)__n; |
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return ((char*)__result) + (long)__extra_before; |
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} |
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template <class _Alloc> |
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void _STLP_CALL |
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__debug_alloc<_Alloc>::deallocate(void *__p, size_t __n) { |
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__alloc_header * __real_p = (__alloc_header*)((char *)__p -(long)__extra_before); |
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// check integrity |
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_STLP_VERBOSE_ASSERT(__real_p->__magic != __deleted_magic, _StlMsg_DBA_DELETED_TWICE) |
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_STLP_VERBOSE_ASSERT(__real_p->__magic == __magic, _StlMsg_DBA_NEVER_ALLOCATED) |
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_STLP_VERBOSE_ASSERT(__real_p->__type_size == 1,_StlMsg_DBA_TYPE_MISMATCH) |
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_STLP_VERBOSE_ASSERT(__real_p->_M_size == __n, _StlMsg_DBA_SIZE_MISMATCH) |
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// check pads on both sides |
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unsigned char* __tmp; |
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for (__tmp= (unsigned char*)(__real_p+1); __tmp < (unsigned char*)__p; __tmp++) { |
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_STLP_VERBOSE_ASSERT(*__tmp==__shred_byte, _StlMsg_DBA_UNDERRUN) |
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114 |
} |
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115 |
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size_t __real_n= __n + __extra_before_chunk() + __extra_after_chunk(); |
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117 |
|
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for (__tmp= ((unsigned char*)__p)+__n*sizeof(value_type); |
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__tmp < ((unsigned char*)__real_p)+__real_n ; __tmp++) { |
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_STLP_VERBOSE_ASSERT(*__tmp==__shred_byte, _StlMsg_DBA_OVERRUN) |
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} |
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122 |
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// that may be unfortunate, just in case |
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__real_p->__magic=__deleted_magic; |
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memset((char*)__p, __shred_byte, __n*sizeof(value_type)); |
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__allocator_type::deallocate(__real_p, __real_n); |
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127 |
} |
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128 |
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129 |
#ifndef _STLP_NO_NODE_ALLOC |
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130 |
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// # ifdef _STLP_THREADS |
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132 |
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133 |
template <bool __threads, int __inst> |
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class _Node_Alloc_Lock { |
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135 |
public: |
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_Node_Alloc_Lock() { |
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137 |
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# ifdef _STLP_SGI_THREADS |
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if (__threads && __us_rsthread_malloc) |
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# else /* !_STLP_SGI_THREADS */ |
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if (__threads) |
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142 |
# endif |
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_S_lock._M_acquire_lock(); |
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144 |
} |
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145 |
|
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~_Node_Alloc_Lock() { |
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# ifdef _STLP_SGI_THREADS |
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if (__threads && __us_rsthread_malloc) |
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# else /* !_STLP_SGI_THREADS */ |
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150 |
if (__threads) |
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151 |
# endif |
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_S_lock._M_release_lock(); |
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153 |
} |
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154 |
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static _STLP_STATIC_MUTEX _S_lock; |
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}; |
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157 |
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158 |
// # endif /* _STLP_THREADS */ |
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159 |
|
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160 |
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161 |
template <bool __threads, int __inst> |
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162 |
void* _STLP_CALL |
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__node_alloc<__threads, __inst>::_M_allocate(size_t __n) { |
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void* __r; |
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_Obj * _STLP_VOLATILE * __my_free_list = _S_free_list + _S_FREELIST_INDEX(__n); |
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166 |
// # ifdef _STLP_THREADS |
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/*REFERENCED*/ |
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_Node_Alloc_Lock<__threads, __inst> __lock_instance; |
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// # endif |
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// Acquire the lock here with a constructor call. |
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// This ensures that it is released in exit or during stack |
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// unwinding. |
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if ( (__r = *__my_free_list) != 0 ) { |
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*__my_free_list = ((_Obj*)__r) -> _M_free_list_link; |
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175 |
} else { |
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__r = _S_refill(__n); |
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177 |
} |
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// lock is released here |
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return __r; |
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180 |
} |
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181 |
|
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182 |
template <bool __threads, int __inst> |
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183 |
void _STLP_CALL |
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__node_alloc<__threads, __inst>::_M_deallocate(void *__p, size_t __n) { |
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_Obj * _STLP_VOLATILE * __my_free_list = _S_free_list + _S_FREELIST_INDEX(__n); |
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186 |
// # ifdef _STLP_THREADS |
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187 |
/*REFERENCED*/ |
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_Node_Alloc_Lock<__threads, __inst> __lock_instance; |
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189 |
// # endif /* _STLP_THREADS */ |
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// acquire lock |
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((_Obj *)__p) -> _M_free_list_link = *__my_free_list; |
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*__my_free_list = (_Obj *)__p; |
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// lock is released here |
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194 |
} |
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195 |
|
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196 |
/* We allocate memory in large chunks in order to avoid fragmenting */ |
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197 |
/* the malloc heap too much. */ |
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/* We assume that size is properly aligned. */ |
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/* We hold the allocation lock. */ |
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200 |
template <bool __threads, int __inst> |
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201 |
char* _STLP_CALL |
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__node_alloc<__threads, __inst>::_S_chunk_alloc(size_t _p_size, |
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203 |
int& __nobjs) |
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204 |
{ |
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205 |
char* __result; |
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size_t __total_bytes = _p_size * __nobjs; |
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size_t __bytes_left = _S_end_free - _S_start_free; |
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208 |
|
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if (__bytes_left >= __total_bytes) { |
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__result = _S_start_free; |
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_S_start_free += __total_bytes; |
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return(__result); |
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} else if (__bytes_left >= _p_size) { |
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__nobjs = (int)(__bytes_left/_p_size); |
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__total_bytes = _p_size * __nobjs; |
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__result = _S_start_free; |
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_S_start_free += __total_bytes; |
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return(__result); |
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219 |
} else { |
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size_t __bytes_to_get = |
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2 * __total_bytes + _S_round_up(_S_heap_size >> 4); |
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// Try to make use of the left-over piece. |
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if (__bytes_left > 0) { |
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_Obj* _STLP_VOLATILE* __my_free_list = |
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_S_free_list + _S_FREELIST_INDEX(__bytes_left); |
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226 |
|
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((_Obj*)_S_start_free) -> _M_free_list_link = *__my_free_list; |
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*__my_free_list = (_Obj*)_S_start_free; |
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} |
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_S_start_free = (char*)__stlp_chunk_malloc(__bytes_to_get); |
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if (0 == _S_start_free) { |
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size_t __i; |
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_Obj* _STLP_VOLATILE* __my_free_list; |
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_Obj* __p; |
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// Try to make do with what we have. That can't |
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// hurt. We do not try smaller requests, since that tends |
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// to result in disaster on multi-process machines. |
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for (__i = _p_size; __i <= (size_t)_MAX_BYTES; __i += (size_t)_ALIGN) { |
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__my_free_list = _S_free_list + _S_FREELIST_INDEX(__i); |
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__p = *__my_free_list; |
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if (0 != __p) { |
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*__my_free_list = __p -> _M_free_list_link; |
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_S_start_free = (char*)__p; |
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_S_end_free = _S_start_free + __i; |
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return(_S_chunk_alloc(_p_size, __nobjs)); |
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// Any leftover piece will eventually make it to the |
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// right free list. |
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} |
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} |
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_S_end_free = 0; // In case of exception. |
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_S_start_free = (char*)__stlp_chunk_malloc(__bytes_to_get); |
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/* |
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(char*)malloc_alloc::allocate(__bytes_to_get); |
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*/ |
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255 |
|
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// This should either throw an |
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// exception or remedy the situation. Thus we assume it |
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// succeeded. |
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} |
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_S_heap_size += __bytes_to_get; |
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_S_end_free = _S_start_free + __bytes_to_get; |
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return(_S_chunk_alloc(_p_size, __nobjs)); |
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} |
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} |
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265 |
|
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266 |
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/* Returns an object of size __n, and optionally adds to size __n free list.*/ |
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/* We assume that __n is properly aligned. */ |
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/* We hold the allocation lock. */ |
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template <bool __threads, int __inst> |
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void* _STLP_CALL |
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__node_alloc<__threads, __inst>::_S_refill(size_t __n) |
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{ |
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int __nobjs = 20; |
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__n = _S_round_up(__n); |
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char* __chunk = _S_chunk_alloc(__n, __nobjs); |
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_Obj* _STLP_VOLATILE* __my_free_list; |
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_Obj* __result; |
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_Obj* __current_obj; |
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_Obj* __next_obj; |
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int __i; |
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282 |
|
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if (1 == __nobjs) return(__chunk); |
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__my_free_list = _S_free_list + _S_FREELIST_INDEX(__n); |
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285 |
|
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286 |
/* Build free list in chunk */ |
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__result = (_Obj*)__chunk; |
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*__my_free_list = __next_obj = (_Obj*)(__chunk + __n); |
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289 |
for (__i = 1; ; __i++) { |
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__current_obj = __next_obj; |
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__next_obj = (_Obj*)((char*)__next_obj + __n); |
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if (__nobjs - 1 == __i) { |
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__current_obj -> _M_free_list_link = 0; |
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break; |
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} else { |
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__current_obj -> _M_free_list_link = __next_obj; |
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297 |
} |
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298 |
} |
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return(__result); |
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300 |
} |
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301 |
|
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# if ( _STLP_STATIC_TEMPLATE_DATA > 0 ) |
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// malloc_alloc out-of-memory handling |
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304 |
template <int __inst> |
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__oom_handler_type __malloc_alloc<__inst>::__oom_handler=(__oom_handler_type)0 ; |
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306 |
|
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#ifdef _STLP_THREADS |
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308 |
template <bool __threads, int __inst> |
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_STLP_STATIC_MUTEX |
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_Node_Alloc_Lock<__threads, __inst>::_S_lock _STLP_MUTEX_INITIALIZER; |
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#endif |
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312 |
|
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313 |
template <bool __threads, int __inst> |
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_Node_alloc_obj * _STLP_VOLATILE |
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__node_alloc<__threads, __inst>::_S_free_list[_STLP_NFREELISTS] |
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= {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; |
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// The 16 zeros are necessary to make version 4.1 of the SunPro |
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// compiler happy. Otherwise it appears to allocate too little |
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// space for the array. |
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320 |
|
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321 |
template <bool __threads, int __inst> |
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char *__node_alloc<__threads, __inst>::_S_start_free = 0; |
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323 |
|
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324 |
template <bool __threads, int __inst> |
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char *__node_alloc<__threads, __inst>::_S_end_free = 0; |
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326 |
|
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327 |
template <bool __threads, int __inst> |
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size_t __node_alloc<__threads, __inst>::_S_heap_size = 0; |
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329 |
|
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330 |
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# else /* ( _STLP_STATIC_TEMPLATE_DATA > 0 ) */ |
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332 |
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__DECLARE_INSTANCE(__oom_handler_type, __malloc_alloc<0>::__oom_handler, =0); |
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# define _STLP_ALLOC_NOTHREADS __node_alloc<false, 0> |
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# define _STLP_ALLOC_THREADS __node_alloc<true, 0> |
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# define _STLP_ALLOC_NOTHREADS_LOCK _Node_Alloc_Lock<false, 0> |
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# define _STLP_ALLOC_THREADS_LOCK _Node_Alloc_Lock<true, 0> |
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__DECLARE_INSTANCE(char *, _STLP_ALLOC_NOTHREADS::_S_start_free,=0); |
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__DECLARE_INSTANCE(char *, _STLP_ALLOC_NOTHREADS::_S_end_free,=0); |
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__DECLARE_INSTANCE(size_t, _STLP_ALLOC_NOTHREADS::_S_heap_size,=0); |
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__DECLARE_INSTANCE(_Node_alloc_obj * _STLP_VOLATILE, |
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_STLP_ALLOC_NOTHREADS::_S_free_list[_STLP_NFREELISTS], |
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={0}); |
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__DECLARE_INSTANCE(char *, _STLP_ALLOC_THREADS::_S_start_free,=0); |
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__DECLARE_INSTANCE(char *, _STLP_ALLOC_THREADS::_S_end_free,=0); |
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__DECLARE_INSTANCE(size_t, _STLP_ALLOC_THREADS::_S_heap_size,=0); |
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__DECLARE_INSTANCE(_Node_alloc_obj * _STLP_VOLATILE, |
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_STLP_ALLOC_THREADS::_S_free_list[_STLP_NFREELISTS], |
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={0}); |
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// # ifdef _STLP_THREADS |
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__DECLARE_INSTANCE(_STLP_STATIC_MUTEX, |
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_STLP_ALLOC_NOTHREADS_LOCK::_S_lock, |
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_STLP_MUTEX_INITIALIZER); |
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__DECLARE_INSTANCE(_STLP_STATIC_MUTEX, |
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_STLP_ALLOC_THREADS_LOCK::_S_lock, |
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_STLP_MUTEX_INITIALIZER); |
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// # endif |
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# undef _STLP_ALLOC_THREADS |
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# undef _STLP_ALLOC_NOTHREADS |
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# endif /* _STLP_STATIC_TEMPLATE_DATA */ |
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#endif |
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_STLP_END_NAMESPACE |
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# undef _S_FREELIST_INDEX |
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# endif /* _STLP_EXPOSE_GLOBALS_IMPLEMENTATION */ |
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#endif /* _STLP_ALLOC_C */ |
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// Local Variables: |
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// mode:C++ |
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// End: |