open source configurator

guest, The Oom_malloc () and Oom_relloc () functions throw bad_alloc exceptions or terminate the program with exit (1); The configuration policy of the SGI second-level configurator: If the area is large enough, More than 128Bytes, it is transferred to the first Level configurator processing; When the region is less than 128Bytes, the memory pool management; memory pool management policy: Proactively raise

list.*// * We assume that n is properly aligned. *// * We hold the allocation lock. */Template BOOLThreadsintInst>void* __default_alloc_templateintNOBJS = -;Char* Chunk = Chunk_alloc (n, NOBJS);//default allocation of 20 N-byte spaceobj * __volatile * my_free_list; obj * result; obj * current_obj, * next_obj;intIif(1= = NOBJS)return(chunk); My_free_list = free_list + freelist_index (n);/ * Build free list in chunk * /result = (obj *) chunk; *my_free_list = Next_obj = (obj *) (chunk + N);//Th

I have read the source code of the STL space configurator and summarized it as follows:1. STL space configurator: It mainly consists of three file implementations. stl_construct.h defines the global functions construct () and destroy (), which are responsible for Object Construction and Analysis. The stl_alloc.h file defines level 1 and level 2 provisors. The pro

directly. The remaining space of the memory pool can not fully meet the demand of 20 blocks, but enough to supply one or more blocks, then take out the space of the number of blocks that can satisfy the condition. The memory pool space can not meet the size of a block, it is first to determine whether there are residual memory space in the memory pool, if there is a recovery, into the free list. Then apply space to the heap to replenish the memory pool. Heap space to meet, space allocation succ

Global constructs and destructors:Template inline void _destroy (char*, char*) {}inline void _destroy (int*, int*) {}inline void _destroy (long*, long*) {}inline void _ Destroy (float*, float*) {}inline void _destroy (double*, double*) {} #ifdef __stl_has_wchar_tinline void _destroy (wchar_t *, wchar_t*) {}To globally replicate and populate bulk data functions:Files: Stl_uninitialized.h Analyze one of the many functions: the Uninitialized_copy function. There are three versions of this function:

; pool_bucket ** free_list_index = free_list _ + freelist_index (n); char * Pool = alloc_memory (n, pool_node_num); if (1 = pool_node_num) {return pool ;} pool_bucket * result = (pool_bucket *) pool; pool_bucket * Current, * Next; pool + = N; * free_list_index = next = (pool_bucket *) pool; next = (pool_bucket *) pool; for (I = 1; ++ I) {current = next; next = (pool_bucket *) (char *) next + n ); if (pool_node_num-1 = I) {current-> next_node = NULL; break;} else {current-> next_node = next;} ret

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