class __mt_alloc
{
public:
- typedef size_t size_type;
- typedef ptrdiff_t difference_type;
- typedef _Tp* pointer;
- typedef const _Tp* const_pointer;
- typedef _Tp& reference;
- typedef const _Tp& const_reference;
- typedef _Tp value_type;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Tp* pointer;
+ typedef const _Tp* const_pointer;
+ typedef _Tp& reference;
+ typedef const _Tp& const_reference;
+ typedef _Tp value_type;
template<typename _Tp1>
struct rebind
~__mt_alloc() throw() { }
pointer
- address(reference __x) const { return &__x; }
+ address(reference __x) const
+ { return &__x; }
const_pointer
- address(const_reference __x) const { return &__x; }
+ address(const_reference __x) const
+ { return &__x; }
size_type
max_size() const throw()
destroy(pointer __p) { __p->~_Tp(); }
pointer
- allocate(size_t __n, const void* = 0);
+ allocate(size_type __n, const void* = 0);
void
deallocate(pointer __p, size_type __n);
// Variables used to configure the behavior of the allocator,
// assigned and explained in detail below.
- struct tune
+ struct _Tune
{
// Allocation requests (after round-up to power of 2) below
// this value will be handled by the allocator. A raw new/
// Set to true forces all allocations to use new().
bool _M_force_new;
- explicit tune()
+ explicit _Tune()
: _M_max_bytes(128), _M_min_bin(8),
_M_chunk_size(4096 - 4 * sizeof(void*)),
#ifdef __GTHREADS
_M_force_new(getenv("GLIBCXX_FORCE_NEW") ? true : false)
{ }
- explicit tune(size_t __maxb, size_t __minbin, size_t __chunk,
- size_t __maxthreads, size_t __headroom, bool __force)
+ explicit _Tune(size_t __maxb, size_t __minbin, size_t __chunk,
+ size_t __maxthreads, size_t __headroom, bool __force)
: _M_max_bytes(__maxb), _M_min_bin(__minbin), _M_chunk_size(__chunk),
_M_max_threads(__maxthreads), _M_freelist_headroom(__headroom),
_M_force_new(__force)
#endif
static bool _S_init;
- static void
+ static void
_S_initialize();
// Configuration options.
- static tune _S_options;
+ static _Tune _S_options;
- static const tune
- _S_get_options() { return _S_options; }
+ static const _Tune
+ _S_get_options()
+ { return _S_options; }
static void
- _S_set_options(tune __t)
+ _S_set_options(_Tune __t)
{
if (!_S_init)
_S_options = __t;
// Using short int as type for the binmap implies we are never
// caching blocks larger than 65535 with this allocator
- typedef unsigned short int binmap_type;
- static binmap_type* _S_binmap;
+ typedef unsigned short int _Binmap_type;
+ static _Binmap_type* _S_binmap;
// Each requesting thread is assigned an id ranging from 1 to
// _S_max_threads. Thread id 0 is used as a global memory pool.
// (i.e. the thread dies) is called, we return the thread id to
// the front of this list.
#ifdef __GTHREADS
- struct thread_record
+ struct _Thread_record
{
// Points to next free thread id record. NULL if last record in list.
- thread_record* volatile next;
+ _Thread_record* volatile _M_next;
// Thread id ranging from 1 to _S_max_threads.
- size_t id;
+ size_t _M_id;
};
- static thread_record* volatile _S_thread_freelist_first;
+ static _Thread_record* volatile _S_thread_freelist_first;
static __gthread_mutex_t _S_thread_freelist_mutex;
static __gthread_key_t _S_thread_key;
static void
- _S_destroy_thread_key(void* freelist_pos);
+ _S_destroy_thread_key(void* __freelist_pos);
#endif
static size_t
_S_get_thread_id();
- union block_record
+ union _Block_record
{
// Points to the next block_record for its thread_id.
- block_record* volatile next;
+ _Block_record* volatile _M_next;
// The thread id of the thread which has requested this block.
#ifdef __GTHREADS
- size_t thread_id;
+ size_t _M_thread_id;
#endif
};
- struct bin_record
+ struct _Bin_record
{
// An "array" of pointers to the first free block for each
// thread id. Memory to this "array" is allocated in _S_initialize()
// for _S_max_threads + global pool 0.
- block_record** volatile first;
+ _Block_record** volatile _M_first;
// An "array" of counters used to keep track of the amount of
// blocks that are on the freelist/used for each thread id.
// Memory to these "arrays" is allocated in _S_initialize() for
// _S_max_threads + global pool 0.
- size_t* volatile free;
- size_t* volatile used;
+ size_t* volatile _M_free;
+ size_t* volatile _M_used;
// Each bin has its own mutex which is used to ensure data
// integrity while changing "ownership" on a block. The mutex
// is initialized in _S_initialize().
#ifdef __GTHREADS
- __gthread_mutex_t* mutex;
+ __gthread_mutex_t* _M_mutex;
#endif
};
// An "array" of bin_records each of which represents a specific
// power of 2 size. Memory to this "array" is allocated in
// _S_initialize().
- static bin_record* volatile _S_bin;
+ static _Bin_record* volatile _S_bin;
// Actual value calculated in _S_initialize().
static size_t _S_bin_size;
template<typename _Tp>
typename __mt_alloc<_Tp>::pointer
__mt_alloc<_Tp>::
- allocate(size_t __n, const void*)
+ allocate(size_type __n, const void*)
{
// Although the test in __gthread_once() would suffice, we wrap
// test of the once condition in our own unlocked check. This
void* __ret = ::operator new(__bytes);
return static_cast<_Tp*>(__ret);
}
-
+
// Round up to power of 2 and figure out which bin to use.
const size_t __which = _S_binmap[__bytes];
const size_t __thread_id = _S_get_thread_id();
// Find out if we have blocks on our freelist. If so, go ahead
// and use them directly without having to lock anything.
- const bin_record& __bin = _S_bin[__which];
- block_record* block = NULL;
- if (__bin.first[__thread_id] == NULL)
+ const _Bin_record& __bin = _S_bin[__which];
+ _Block_record* __block = NULL;
+ if (__bin._M_first[__thread_id] == NULL)
{
+ const size_t __bin_size = ((_S_options._M_min_bin << __which)
+ + sizeof(_Block_record));
+ size_t __block_count = _S_options._M_chunk_size / __bin_size;
+
// Are we using threads?
// - Yes, check if there are free blocks on the global
- // list. If so, grab up to block_count blocks in one
+ // list. If so, grab up to __block_count blocks in one
// lock and change ownership. If the global list is
// empty, we allocate a new chunk and add those blocks
// directly to our own freelist (with us as owner).
#ifdef __GTHREADS
if (__gthread_active_p())
{
- const size_t bin_size = ((_S_options._M_min_bin << __which)
- + sizeof(block_record));
- size_t block_count = _S_options._M_chunk_size / bin_size;
-
- __gthread_mutex_lock(__bin.mutex);
- if (__bin.first[0] == NULL)
+ __gthread_mutex_lock(__bin._M_mutex);
+ if (__bin._M_first[0] == NULL)
{
// No need to hold the lock when we are adding a
// whole chunk to our own list.
- __gthread_mutex_unlock(__bin.mutex);
-
- void* v = ::operator new(_S_options._M_chunk_size);
- __bin.first[__thread_id] = static_cast<block_record*>(v);
+ __gthread_mutex_unlock(__bin._M_mutex);
- __bin.free[__thread_id] = block_count;
- block_count--;
- block = __bin.first[__thread_id];
-
- while (block_count > 0)
+ void* __v = ::operator new(_S_options._M_chunk_size);
+ __bin._M_first[__thread_id] = static_cast<_Block_record*>(__v);
+ __bin._M_free[__thread_id] = __block_count;
+
+ --__block_count;
+ __block = __bin._M_first[__thread_id];
+ while (__block_count > 0)
{
- char* c = reinterpret_cast<char*>(block) + bin_size;
- block->next = reinterpret_cast<block_record*>(c);
- block = block->next;
- block_count--;
+ char* __c = reinterpret_cast<char*>(__block) + __bin_size;
+ __block->_M_next = reinterpret_cast<_Block_record*>(__c);
+ __block = __block->_M_next;
+ --__block_count;
}
- block->next = NULL;
+ __block->_M_next = NULL;
}
else
{
- size_t global_count = 0;
- block_record* tmp;
- while (__bin.first[0] != NULL && global_count < block_count)
+ while (__bin._M_first[0] != NULL && __block_count > 0)
{
- tmp = __bin.first[0]->next;
- block = __bin.first[0];
+ _Block_record* __tmp = __bin._M_first[0]->_M_next;
+ __block = __bin._M_first[0];
- block->next = __bin.first[__thread_id];
- __bin.first[__thread_id] = block;
+ __block->_M_next = __bin._M_first[__thread_id];
+ __bin._M_first[__thread_id] = __block;
- __bin.free[__thread_id]++;
- __bin.first[0] = tmp;
- global_count++;
+ ++__bin._M_free[__thread_id];
+ __bin._M_first[0] = __tmp;
+ --__block_count;
}
- __gthread_mutex_unlock(__bin.mutex);
+ __gthread_mutex_unlock(__bin._M_mutex);
}
// Return the first newly added block in our list and
// update the counters
- block = __bin.first[__thread_id];
- __bin.first[__thread_id] = __bin.first[__thread_id]->next;
- block->thread_id = __thread_id;
- __bin.free[__thread_id]--;
- __bin.used[__thread_id]++;
+ __block = __bin._M_first[__thread_id];
+ __bin._M_first[__thread_id] = __bin._M_first[__thread_id]->_M_next;
+ __block->_M_thread_id = __thread_id;
+ --__bin._M_free[__thread_id];
+ ++__bin._M_used[__thread_id];
}
else
#endif
{
void* __v = ::operator new(_S_options._M_chunk_size);
- __bin.first[0] = static_cast<block_record*>(__v);
-
- const size_t bin_size = ((_S_options._M_min_bin << __which)
- + sizeof(block_record));
- size_t block_count = _S_options._M_chunk_size / bin_size;
+ __bin._M_first[0] = static_cast<_Block_record*>(__v);
- block_count--;
- block = __bin.first[0];
- while (block_count > 0)
+ --__block_count;
+ __block = __bin._M_first[0];
+ while (__block_count > 0)
{
- char* __c = reinterpret_cast<char*>(block) + bin_size;
- block->next = reinterpret_cast<block_record*>(__c);
- block = block->next;
- block_count--;
+ char* __c = reinterpret_cast<char*>(__block) + __bin_size;
+ __block->_M_next = reinterpret_cast<_Block_record*>(__c);
+ __block = __block->_M_next;
+ --__block_count;
}
- block->next = NULL;
+ __block->_M_next = NULL;
// Remove from list.
- block = __bin.first[0];
- __bin.first[0] = __bin.first[0]->next;
+ __block = __bin._M_first[0];
+ __bin._M_first[0] = __bin._M_first[0]->_M_next;
}
}
else
{
// "Default" operation - we have blocks on our own freelist
// grab the first record and update the counters.
- block = __bin.first[__thread_id];
- __bin.first[__thread_id] = __bin.first[__thread_id]->next;
+ __block = __bin._M_first[__thread_id];
+ __bin._M_first[__thread_id] = __bin._M_first[__thread_id]->_M_next;
#ifdef __GTHREADS
- block->thread_id = __thread_id;
if (__gthread_active_p())
{
- __bin.free[__thread_id]--;
- __bin.used[__thread_id]++;
+ __block->_M_thread_id = __thread_id;
+ --__bin._M_free[__thread_id];
+ ++__bin._M_used[__thread_id];
}
#endif
}
- char* __c = reinterpret_cast<char*>(block) + sizeof(block_record);
+ char* __c = reinterpret_cast<char*>(__block) + sizeof(_Block_record);
return static_cast<_Tp*>(static_cast<void*>(__c));
}
-
template<typename _Tp>
void
__mt_alloc<_Tp>::
// Round up to power of 2 and figure out which bin to use.
const size_t __which = _S_binmap[__bytes];
- const bin_record& __bin = _S_bin[__which];
+ const _Bin_record& __bin = _S_bin[__which];
- char* __c = reinterpret_cast<char*>(__p) - sizeof(block_record);
- block_record* block = reinterpret_cast<block_record*>(__c);
+ char* __c = reinterpret_cast<char*>(__p) - sizeof(_Block_record);
+ _Block_record* __block = reinterpret_cast<_Block_record*>(__c);
#ifdef __GTHREADS
- const size_t thread_id = _S_get_thread_id();
if (__gthread_active_p())
{
// Calculate the number of records to remove from our freelist.
- int remove = __bin.free[thread_id] -
- (__bin.used[thread_id] / _S_options._M_freelist_headroom);
+ const size_t __thread_id = _S_get_thread_id();
+ int __remove = (__bin._M_free[__thread_id]
+ - (__bin._M_used[__thread_id]
+ / _S_options._M_freelist_headroom));
// The calculation above will almost always tell us to
// remove one or two records at a time, but this creates too
// much contention when locking and therefore we wait until
// the number of records is "high enough".
int __cond1 = static_cast<int>(100 * (_S_bin_size - __which));
- int __cond2 = static_cast<int>(__bin.free[thread_id]
+ int __cond2 = static_cast<int>(__bin._M_free[__thread_id]
/ _S_options._M_freelist_headroom);
- if (remove > __cond1 && remove > __cond2)
+ if (__remove > __cond1 && __remove > __cond2)
{
- __gthread_mutex_lock(__bin.mutex);
- block_record* tmp;
- while (remove > 0)
+ __gthread_mutex_lock(__bin._M_mutex);
+ _Block_record* __tmp = __bin._M_first[__thread_id];
+ _Block_record* __first = __tmp;
+ const int __removed = __remove;
+ while (__remove > 1)
{
- tmp = __bin.first[thread_id]->next;
- __bin.first[thread_id]->next = __bin.first[0];
- __bin.first[0] = __bin.first[thread_id];
-
- __bin.first[thread_id] = tmp;
- __bin.free[thread_id]--;
- remove--;
+ __tmp = __tmp->_M_next;
+ --__remove;
}
- __gthread_mutex_unlock(__bin.mutex);
+ __bin._M_first[__thread_id] = __tmp->_M_next;
+ __tmp->_M_next = __bin._M_first[0];
+ __bin._M_first[0] = __first;
+ __bin._M_free[__thread_id] -= __removed;
+ __gthread_mutex_unlock(__bin._M_mutex);
}
// Return this block to our list and update counters and
// owner id as needed.
- __bin.used[block->thread_id]--;
+ --__bin._M_used[__block->_M_thread_id];
- block->next = __bin.first[thread_id];
- __bin.first[thread_id] = block;
+ __block->_M_next = __bin._M_first[__thread_id];
+ __bin._M_first[__thread_id] = __block;
- __bin.free[thread_id]++;
+ ++__bin._M_free[__thread_id];
}
else
#endif
{
// Single threaded application - return to global pool.
- block->next = __bin.first[0];
- __bin.first[0] = block;
+ __block->_M_next = __bin._M_first[0];
+ __bin._M_first[0] = __block;
}
}
while (_S_options._M_max_bytes > __bin_size)
{
__bin_size <<= 1;
- _S_bin_size++;
+ ++_S_bin_size;
}
// Setup the bin map for quick lookup of the relevant bin.
- const size_t __j = (_S_options._M_max_bytes + 1) * sizeof(binmap_type);
- _S_binmap = static_cast<binmap_type*>(::operator new(__j));
+ const size_t __j = (_S_options._M_max_bytes + 1) * sizeof(_Binmap_type);
+ _S_binmap = static_cast<_Binmap_type*>(::operator new(__j));
- binmap_type* __bp = _S_binmap;
- binmap_type __bin_max = _S_options._M_min_bin;
- binmap_type __bint = 0;
- for (binmap_type __ct = 0; __ct <= _S_options._M_max_bytes; __ct++)
+ _Binmap_type* __bp = _S_binmap;
+ _Binmap_type __bin_max = _S_options._M_min_bin;
+ _Binmap_type __bint = 0;
+ for (_Binmap_type __ct = 0; __ct <= _S_options._M_max_bytes; ++__ct)
{
if (__ct > __bin_max)
{
__bin_max <<= 1;
- __bint++;
+ ++__bint;
}
*__bp++ = __bint;
}
#ifdef __GTHREADS
if (__gthread_active_p())
{
- const size_t __k = sizeof(thread_record) * _S_options._M_max_threads;
+ const size_t __k = sizeof(_Thread_record) * _S_options._M_max_threads;
__v = ::operator new(__k);
- _S_thread_freelist_first = static_cast<thread_record*>(__v);
+ _S_thread_freelist_first = static_cast<_Thread_record*>(__v);
// NOTE! The first assignable thread id is 1 since the
// global pool uses id 0
size_t __i;
- for (__i = 1; __i < _S_options._M_max_threads; __i++)
+ for (__i = 1; __i < _S_options._M_max_threads; ++__i)
{
- thread_record& __tr = _S_thread_freelist_first[__i - 1];
- __tr.next = &_S_thread_freelist_first[__i];
- __tr.id = __i;
+ _Thread_record& __tr = _S_thread_freelist_first[__i - 1];
+ __tr._M_next = &_S_thread_freelist_first[__i];
+ __tr._M_id = __i;
}
// Set last record.
- _S_thread_freelist_first[__i - 1].next = NULL;
- _S_thread_freelist_first[__i - 1].id = __i;
-
+ _S_thread_freelist_first[__i - 1]._M_next = NULL;
+ _S_thread_freelist_first[__i - 1]._M_id = __i;
// Make sure this is initialized.
#ifndef __GTHREAD_MUTEX_INIT
#endif
// Initialize _S_bin and its members.
- __v = ::operator new(sizeof(bin_record) * _S_bin_size);
- _S_bin = static_cast<bin_record*>(__v);
+ __v = ::operator new(sizeof(_Bin_record) * _S_bin_size);
+ _S_bin = static_cast<_Bin_record*>(__v);
// Maximum number of threads.
size_t __max_threads = 1;
__max_threads = _S_options._M_max_threads + 1;
#endif
- for (size_t __n = 0; __n < _S_bin_size; __n++)
+ for (size_t __n = 0; __n < _S_bin_size; ++__n)
{
- bin_record& __bin = _S_bin[__n];
- __v = ::operator new(sizeof(block_record*) * __max_threads);
- __bin.first = static_cast<block_record**>(__v);
+ _Bin_record& __bin = _S_bin[__n];
+ __v = ::operator new(sizeof(_Block_record*) * __max_threads);
+ __bin._M_first = static_cast<_Block_record**>(__v);
#ifdef __GTHREADS
if (__gthread_active_p())
{
__v = ::operator new(sizeof(size_t) * __max_threads);
- __bin.free = static_cast<size_t*>(__v);
+ __bin._M_free = static_cast<size_t*>(__v);
__v = ::operator new(sizeof(size_t) * __max_threads);
- __bin.used = static_cast<size_t*>(__v);
+ __bin._M_used = static_cast<size_t*>(__v);
__v = ::operator new(sizeof(__gthread_mutex_t));
- __bin.mutex = static_cast<__gthread_mutex_t*>(__v);
+ __bin._M_mutex = static_cast<__gthread_mutex_t*>(__v);
#ifdef __GTHREAD_MUTEX_INIT
{
// Do not copy a POSIX/gthr mutex once in use.
__gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
- *__bin.mutex = __tmp;
+ *__bin._M_mutex = __tmp;
}
#else
- { __GTHREAD_MUTEX_INIT_FUNCTION(__bin.mutex); }
+ { __GTHREAD_MUTEX_INIT_FUNCTION(__bin._M_mutex); }
#endif
}
#endif
- for (size_t __threadn = 0; __threadn < __max_threads; __threadn++)
+ for (size_t __threadn = 0; __threadn < __max_threads; ++__threadn)
{
- __bin.first[__threadn] = NULL;
+ __bin._M_first[__threadn] = NULL;
#ifdef __GTHREADS
if (__gthread_active_p())
{
- __bin.free[__threadn] = 0;
- __bin.used[__threadn] = 0;
+ __bin._M_free[__threadn] = 0;
+ __bin._M_used[__threadn] = 0;
}
#endif
}
{
#ifdef __GTHREADS
// If we have thread support and it's active we check the thread
- // key value and return it's id or if it's not set we take the
+ // key value and return its id or if it's not set we take the
// first record from _S_thread_freelist and sets the key and
// returns it's id.
if (__gthread_active_p())
{
- thread_record* __freelist_pos =
- static_cast<thread_record*>(__gthread_getspecific(_S_thread_key));
+ _Thread_record* __freelist_pos =
+ static_cast<_Thread_record*>(__gthread_getspecific(_S_thread_key));
if (__freelist_pos == NULL)
{
// Since _S_options._M_max_threads must be larger than
// list can never be empty.
__gthread_mutex_lock(&_S_thread_freelist_mutex);
__freelist_pos = _S_thread_freelist_first;
- _S_thread_freelist_first = _S_thread_freelist_first->next;
+ _S_thread_freelist_first = _S_thread_freelist_first->_M_next;
__gthread_mutex_unlock(&_S_thread_freelist_mutex);
__gthread_setspecific(_S_thread_key,
static_cast<void*>(__freelist_pos));
}
- return __freelist_pos->id;
+ return __freelist_pos->_M_id;
}
#endif
// Otherwise (no thread support or inactive) all requests are
{
// Return this thread id record to front of thread_freelist.
__gthread_mutex_lock(&_S_thread_freelist_mutex);
- thread_record* __tr = static_cast<thread_record*>(__freelist_pos);
- __tr->next = _S_thread_freelist_first;
+ _Thread_record* __tr = static_cast<_Thread_record*>(__freelist_pos);
+ __tr->_M_next = _S_thread_freelist_first;
_S_thread_freelist_first = __tr;
__gthread_mutex_unlock(&_S_thread_freelist_mutex);
}
bool __mt_alloc<_Tp>::_S_init = false;
template<typename _Tp>
- typename __mt_alloc<_Tp>::tune __mt_alloc<_Tp>::_S_options;
+ typename __mt_alloc<_Tp>::_Tune __mt_alloc<_Tp>::_S_options;
template<typename _Tp>
- typename __mt_alloc<_Tp>::binmap_type* __mt_alloc<_Tp>::_S_binmap;
+ typename __mt_alloc<_Tp>::_Binmap_type* __mt_alloc<_Tp>::_S_binmap;
template<typename _Tp>
- typename __mt_alloc<_Tp>::bin_record* volatile __mt_alloc<_Tp>::_S_bin;
+ typename __mt_alloc<_Tp>::_Bin_record* volatile __mt_alloc<_Tp>::_S_bin;
template<typename _Tp>
size_t __mt_alloc<_Tp>::_S_bin_size = 1;
__gthread_once_t __mt_alloc<_Tp>::_S_once = __GTHREAD_ONCE_INIT;
template<typename _Tp>
- typename __mt_alloc<_Tp>::thread_record*
+ typename __mt_alloc<_Tp>::_Thread_record*
volatile __mt_alloc<_Tp>::_S_thread_freelist_first = NULL;
template<typename _Tp>
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