/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Copyright by the Board of Trustees of the University of Illinois. * * All rights reserved. * * * * This file is part of HDF5. The full HDF5 copyright notice, including * * terms governing use, modification, and redistribution, is contained in * * the files COPYING and Copyright.html. COPYING can be found at the root * * of the source code distribution tree; Copyright.html can be found at the * * root level of an installed copy of the electronic HDF5 document set and * * is linked from the top-level documents page. It can also be found at * * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have * * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* Programmer: Quincey Koziol * Tuesday, March 7, 2006 * * Purpose: Fractal heap free space functions. * */ /****************/ /* Module Setup */ /****************/ #define H5HF_PACKAGE /*suppress error about including H5HFpkg */ /***********/ /* Headers */ /***********/ #include "H5private.h" /* Generic Functions */ #include "H5Eprivate.h" /* Error handling */ #include "H5HFpkg.h" /* Fractal heaps */ #include "H5Vprivate.h" /* Vectors and arrays */ /****************/ /* Local Macros */ /****************/ /* Max. height of the skip list holding free list nodes */ #define H5HF_FLIST_DEFAULT_SKIPLIST_HEIGHT 16 /******************/ /* Local Typedefs */ /******************/ /* Free list node for free list sections of the same size */ typedef struct H5HF_flist_node_t { size_t sec_size; /* Size of all sections on list */ H5SL_t *sec_list; /* Skip list to hold pointers to actual free list section node */ } H5HF_flist_node_t; /********************/ /* Package Typedefs */ /********************/ /* Main free list info */ struct H5HF_freelist_t { hsize_t tot_space; /* Total amount of space in free list */ unsigned nbins; /* Number of bins */ H5SL_operator_t node_free_op; /* Callback for freeing nodes when free list is destroyed */ H5SL_t **bins; /* Pointer to array of lists of free nodes */ }; /********************/ /* Local Prototypes */ /********************/ static herr_t H5HF_flist_node_free_cb(void *item, void *key, void *op_data); /*********************/ /* Package Variables */ /*********************/ /* Declare a free list to manage the H5HF_freelist_t struct */ H5FL_DEFINE_STATIC(H5HF_freelist_t); /* Declare a free list to manage the H5HF_flist_node_t struct */ H5FL_DEFINE_STATIC(H5HF_flist_node_t); /* Declare a free list to manage the 'H5SL_t *' sequence information */ typedef H5SL_t *H5SL_ptr_t; H5FL_SEQ_DEFINE_STATIC(H5SL_ptr_t); /*****************************/ /* Library Private Variables */ /*****************************/ /*******************/ /* Local Variables */ /*******************/ /*------------------------------------------------------------------------- * Function: H5HF_flist_create * * Purpose: Allocate & initialize free list for heap * * Return: Success: Pointer to free list structure * * Failure: NULL * * Programmer: Quincey Koziol * Tuesday, March 7, 2006 * *------------------------------------------------------------------------- */ H5HF_freelist_t * H5HF_flist_create(size_t max_block_size, H5SL_operator_t node_free_op) { H5HF_freelist_t *flist; /* New free list structure */ H5HF_freelist_t *ret_value; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5HF_flist_create) /* Check arguments. */ /* * Allocate top free list structure */ if(NULL == (flist = H5FL_MALLOC(H5HF_freelist_t))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for fractal heap free list") /* Set free list parameters */ flist->tot_space = 0; flist->nbins = H5V_log2_of2(max_block_size); flist->node_free_op = node_free_op; /* Allocate the bins for free space sizes */ if(NULL == (flist->bins = H5FL_SEQ_CALLOC(H5SL_ptr_t, flist->nbins))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for free list bins") /* Set return value */ ret_value = flist; done: FUNC_LEAVE_NOAPI(ret_value) } /* H5HF_flist_create() */ /*------------------------------------------------------------------------- * Function: H5HF_flist_add * * Purpose: Add a section of free space in a direct block to the free list * * Return: Success: non-negative * * Failure: negative * * Programmer: Quincey Koziol * Tuesday, March 7, 2006 * *------------------------------------------------------------------------- */ herr_t H5HF_flist_add(H5HF_freelist_t *flist, void *node, size_t *size_key, haddr_t *addr_key) { H5HF_flist_node_t *flist_node = NULL; /* Pointer to free list node of the correct size */ unsigned bin; /* Bin to put the free space section in */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5HF_flist_add) #ifdef QAK HDfprintf(stderr, "%s: *size_key = %Zu, *addr_key = %a\n", FUNC, *size_key, *addr_key); #endif /* QAK */ /* Check arguments. */ HDassert(flist); HDassert(node); HDassert(size_key); HDassert(addr_key); /* Determine correct bin which holds items of the section's size */ bin = H5V_log2_gen((hsize_t)*size_key); if(flist->bins[bin] == NULL) { if(NULL == (flist->bins[bin] = H5SL_create(H5SL_TYPE_SIZE, 0.5, H5HF_FLIST_DEFAULT_SKIPLIST_HEIGHT))) HGOTO_ERROR(H5E_HEAP, H5E_CANTCREATE, FAIL, "can't create skip list for free list nodes") } /* end if */ else { /* Check for node list of the correct size already */ flist_node = H5SL_search(flist->bins[bin], size_key); } /* end else */ /* Check if we need to create a new skip list for nodes of this size */ if(flist_node == NULL) { /* Allocate new free list size node */ if(NULL == (flist_node = H5FL_MALLOC(H5HF_flist_node_t))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for fractal heap free list") /* Initialize the free list size node */ flist_node->sec_size = *size_key; if(NULL == (flist_node->sec_list = H5SL_create(H5SL_TYPE_HADDR, 0.5, H5HF_FLIST_DEFAULT_SKIPLIST_HEIGHT))) HGOTO_ERROR(H5E_HEAP, H5E_CANTCREATE, FAIL, "can't create skip list for free list nodes") /* Insert new free list size node into bin's list */ if(H5SL_insert(flist->bins[bin], flist_node, &flist_node->sec_size) < 0) HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "can't insert free list node into skip list") } /* end if */ /* Insert free list node into correct skip list */ if(H5SL_insert(flist_node->sec_list, node, addr_key) < 0) HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "can't insert free list node into skip list") done: FUNC_LEAVE_NOAPI(ret_value) } /* H5HF_flist_add() */ /*------------------------------------------------------------------------- * Function: H5HF_flist_find * * Purpose: Locate a section of free space (in existing free list) that * is large enough to fulfill request. * * Return: Success: non-negative * * Failure: negative * * Programmer: Quincey Koziol * Tuesday, March 7, 2006 * *------------------------------------------------------------------------- */ htri_t H5HF_flist_find(H5HF_freelist_t *flist, size_t request, void **node) { H5HF_flist_node_t *flist_node; /* Free list size node */ unsigned bin; /* Bin to put the free space section in */ herr_t ret_value = FALSE; /* Return value */ FUNC_ENTER_NOAPI_NOINIT(H5HF_flist_find) /* Check arguments. */ HDassert(flist); HDassert(request > 0); HDassert(node); /* Determine correct bin which holds items of at least the section's size */ bin = H5V_log2_gen((hsize_t)request); while(bin < flist->nbins && flist->bins[bin] == NULL) bin++; /* Find the first free space section that is large enough to fulfill request */ /* (Since the bins use skip lists to track the sizes of the address-ordered * lists, this is actually a "best fit" algorithm) */ #ifdef QAK HDfprintf(stderr, "%s: flist->nbins = %u\n", FUNC, flist->nbins); HDfprintf(stderr, "%s: bin = %u\n", FUNC, bin); #endif /* QAK */ if(bin < flist->nbins) do { /* Look for large enough free list section in this bin */ if(flist->bins[bin]) /* Check for large enough list of sections on list */ if((flist_node = H5SL_greater(flist->bins[bin], &request))) { /* Take first node off of the list (ie. node w/lowest address) */ if(NULL == (*node = H5SL_remove_first(flist_node->sec_list))) HGOTO_ERROR(H5E_HEAP, H5E_CANTDELETE, FAIL, "can't remove free list node from skip list") /* Check for no more nodes on list of that size */ if(H5SL_count(flist_node->sec_list) == 0) { H5HF_flist_node_t *tmp_flist_node; /* Free list size node */ /* Remove size tracking list from bin */ tmp_flist_node = H5SL_remove(flist->bins[bin], &flist_node->sec_size); if(tmp_flist_node == NULL || tmp_flist_node != flist_node) HGOTO_ERROR(H5E_HEAP, H5E_CANTDELETE, FAIL, "can't remove free list node from skip list") /* Destroy skip list for size tracking node */ if(H5SL_close(flist_node->sec_list) < 0) HGOTO_ERROR(H5E_HEAP, H5E_CANTCLOSEOBJ, FAIL, "can't destroy size tracking node's skip list") /* Release free list node */ H5FL_FREE(H5HF_flist_node_t, flist_node); } /* end if */ HGOTO_DONE(TRUE) } /* end if */ /* Advance to next larger bin */ bin++; } while(bin < flist->nbins); done: FUNC_LEAVE_NOAPI(ret_value) } /* H5HF_flist_find() */ /*------------------------------------------------------------------------- * Function: H5HF_flist_node_free_cb * * Purpose: Free a size-tracking node for a bin * * Return: Success: non-negative * * Failure: negative * * Programmer: Quincey Koziol * Saturday, March 11, 2006 * *------------------------------------------------------------------------- */ static herr_t H5HF_flist_node_free_cb(void *item, void UNUSED *key, void *op_data) { H5HF_flist_node_t *flist_node = (H5HF_flist_node_t *)item; /* Temporary pointer to free list node */ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_flist_node_free_cb) HDassert(flist_node); /* Release the skip list for sections of this size */ H5SL_destroy(flist_node->sec_list, (H5SL_operator_t)op_data, NULL); /* Release free list node */ H5FL_FREE(H5HF_flist_node_t, flist_node); FUNC_LEAVE_NOAPI(0) } /* H5HF_flist_node_free_cb() */ /*------------------------------------------------------------------------- * Function: H5HF_flist_free * * Purpose: Destroy & deallocate free list structure * * Return: Success: non-negative * * Failure: negative * * Programmer: Quincey Koziol * Tuesday, March 7, 2006 * *------------------------------------------------------------------------- */ herr_t H5HF_flist_free(H5HF_freelist_t *flist) { unsigned u; /* Local index variable */ FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5HF_flist_free) /* Check arguments. */ HDassert(flist); /* Clear out lists of nodes */ for(u = 0; u < flist->nbins; u++) if(flist->bins[u]) { H5SL_destroy(flist->bins[u], H5HF_flist_node_free_cb, (void *)flist->node_free_op); flist->bins[u] = NULL; } /* end if */ /* Release bins for skip lists */ H5FL_SEQ_FREE(H5SL_ptr_t, flist->bins); /* Free fractal heap free list info */ H5FL_FREE(H5HF_freelist_t, flist); FUNC_LEAVE_NOAPI(SUCCEED) } /* H5HF_flist_free() */