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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5SH.c
* Mar 9 2005
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: Implement "segmented heaps". These heaps are
*
*-------------------------------------------------------------------------
*/
#define H5SH_PACKAGE /*suppress error about including H5SHpkg */
/* Private headers */
#include "H5private.h" /* Generic Functions */
#include "H5BTprivate.h" /* Block tracker */
#include "H5Eprivate.h" /* Error handling */
#include "H5MFprivate.h" /* File memory management */
#include "H5SHpkg.h" /* Segmented heap */
/* Local macros */
/* Local typedefs */
/* Information needed for extending a heap block during an allocation */
typedef struct {
H5F_t *f; /* File to search for space within */
hid_t dxpl_id; /* DXPL for allocation operation */
haddr_t bt_free_addr; /* Location of free space B-tree */
H5FD_mem_t file_mem_type; /* Type of file memory being used */
hsize_t max_extend_size; /* Maximum size of a block to consider for extention */
hsize_t space_needed; /* Amount of space to allocate */
haddr_t loc; /* Location of space allocated */
haddr_t extend_addr; /* Extended space address */
hsize_t extend_size; /* Extended space size */
} H5SH_extend_t;
/* Local prototypes */
/* Package variables */
/* Declare a free list to manage the H5SH_t struct */
H5FL_DEFINE(H5SH_t);
/* Static variables */
/*-------------------------------------------------------------------------
* Function: H5SH_create
*
* Purpose: Creates a new empty segmented heap in the file.
*
* Return: Non-negative on success (with address of new segmented heap
* filled in), negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 23 2005
*
* Changes: John Mainzer -- 6/7/05
* Removed code modifying the is_dirty field of the cache
* info. Management of this field is in the process of
* being moved to the H5C code.
*
*-------------------------------------------------------------------------
*/
herr_t
H5SH_create(H5F_t *f, hid_t dxpl_id, haddr_t *addr_p, H5SH_data_type_t heap_type,
hsize_t min_size, hsize_t max_extend_size)
{
H5SH_t *sh = NULL; /* Segmented heap info */
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5SH_create, FAIL)
/*
* Check arguments.
*/
HDassert(f);
HDassert(min_size > 0);
HDassert(max_extend_size >= min_size);
/*
* Allocate file and memory data structures.
*/
if (NULL == (sh = H5FL_CALLOC(H5SH_t)))
HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for segmented heap info")
/* Assign internal information */
sh->heap_type = heap_type;
if(sh->heap_type == H5SH_RAW)
sh->file_mem_type = H5FD_MEM_DRAW;
else
sh->file_mem_type = H5FD_MEM_SHEAP_BLOCK;
sh->min_size = min_size;
sh->max_extend_size = max_extend_size;
/* Allocate space for the header on disk */
if (HADDR_UNDEF == (*addr_p = H5MF_alloc(f, H5FD_MEM_SHEAP_HDR, dxpl_id, (hsize_t)H5SH_SIZE(f))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for segmented heap info")
/* Create a block tracker for storing heap block info */
if (H5BT_create(f, dxpl_id, &sh->bt_heap_addr/*out*/) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't create block tracker for storing heap block info")
/* Create a block tracker for storing free space info */
if (H5BT_create(f, dxpl_id, &sh->bt_free_addr/*out*/) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't create block tracker for storing free space info")
/* Cache the new segmented heap node */
if (H5AC_set(f, dxpl_id, H5AC_SGHP, *addr_p, sh, H5AC__NO_FLAGS_SET) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add segmented heap info to cache")
done:
if (ret_value<0) {
if (sh)
(void)H5SH_cache_dest(f, sh);
} /* end if */
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5SH_create() */
/*-------------------------------------------------------------------------
* Function: H5SH_alloc_extend_cb
*
* Purpose: Extend an existing heap block if possible
*
* Return: Non-negative on success (setting flag to indicate block
* was extended), negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 25 2005
*
*-------------------------------------------------------------------------
*/
static int
H5SH_alloc_extend_cb(const H5BT_blk_info_t *record, void *_op_data)
{
H5SH_extend_t *ex_info = (H5SH_extend_t *)_op_data;
htri_t extendable; /* Is block extendable */
int ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5SH_alloc_extend_cb)
/* Check if we are allowed to extend this heap block */
if(record->len < ex_info->max_extend_size) {
H5BT_blk_info_t free_block; /* Block info for free space */
hsize_t space_needed; /* Space needed to extend block */
hbool_t use_free_space = FALSE; /* Flag to indicate that free space should be used */
/* Set the amount of space needed */
space_needed = ex_info->space_needed;
/* Find first free space block before end of extendable block */
free_block.addr = HADDR_UNDEF;
if(H5BT_neighbor(ex_info->f, ex_info->dxpl_id, ex_info->bt_free_addr,
H5BT_COMPARE_LESS, (record->addr + record->len + 1),
&free_block) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_NOSPACE, H5BT_ITER_ERROR, "can't search for free space")
/* Check if we can use free space for part of block to allocate */
if(H5F_addr_defined(free_block.addr) &&
(free_block.addr + free_block.len) == (record->addr + record->len)) {
use_free_space = TRUE;
space_needed -= free_block.len;
} /* end if */
/* Check if this heap block can be extended */
if((extendable = H5MF_can_extend(ex_info->f, ex_info->file_mem_type,
record->addr, record->len, space_needed)) == TRUE) {
/* Extend heap block in the file */
if(H5MF_extend(ex_info->f, ex_info->file_mem_type,
record->addr, record->len, space_needed) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_NOSPACE, H5BT_ITER_ERROR, "can't extend extendable heap block?")
/* Set information to return from iterator */
if(use_free_space) {
/* Remove block from free space tracker */
if(H5BT_remove(ex_info->f, ex_info->dxpl_id, ex_info->bt_free_addr,
free_block.addr, free_block.len) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTDELETE, FAIL, "can't remove free space block")
ex_info->loc = free_block.addr;
} /* end if */
else
ex_info->loc = record->addr + record->len;
/* Set information about extension to block */
ex_info->extend_addr = record->addr + record->len;
ex_info->extend_size = space_needed;
ret_value = H5BT_ITER_STOP;
} /* end if */
else if(extendable == FALSE)
ret_value = H5BT_ITER_CONT;
else
HGOTO_ERROR(H5E_HEAP, H5E_CANTCOMPARE, H5BT_ITER_ERROR, "can't check if heap block is extendable")
} /* end if */
else
ret_value = H5BT_ITER_CONT;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5SH_alloc_extend_cb() */
/*-------------------------------------------------------------------------
* Function: H5SH_alloc
*
* Purpose: Allocate space for a new object in a segmented heap
*
* Return: Non-negative on success (with address of new object
* filled in), negative on failure
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Mar 25 2005
*
* Modifications:
*
* John Mainzer, 6/16/05
* Modified the function to use the new dirtied parameter of
* of H5AC_unprotect() instead of modifying the is_dirty
* field of the cache info.
*
*-------------------------------------------------------------------------
*/
herr_t
H5SH_alloc(H5F_t *f, hid_t dxpl_id, haddr_t addr, hsize_t size, haddr_t *obj_addr_p)
{
H5SH_t *sh = NULL; /* Segmented heap info */
haddr_t free_addr; /* Address of free block */
hsize_t free_len; /* Address of free block */
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5SH_alloc, FAIL)
/*
* Check arguments.
*/
HDassert(f);
/* Look up the segmented heap */
if (NULL == (sh = H5AC_protect(f, dxpl_id, H5AC_SGHP, addr, NULL, NULL, H5AC_WRITE)))
HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to load segmented heap info")
/* Check for block of at least 'size' bytes in free list */
free_addr = HADDR_UNDEF;
if (H5BT_locate(f, dxpl_id, sh->bt_free_addr, size, &free_addr, &free_len) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_NOTFOUND, FAIL, "error searching segmented heap free list")
/* Check for finding large enough free block */
if (H5F_addr_defined(free_addr)) {
/* Remove block from free list */
if (H5BT_remove(f, dxpl_id, sh->bt_free_addr, free_addr, size) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTDELETE, FAIL, "can't remove block")
/* Set address to return */
*obj_addr_p = free_addr;
} /* end if */
else {
H5SH_extend_t ex_info;
/* Iterate over the existing heap blocks, to check for extending one */
ex_info.f = f;
ex_info.dxpl_id = dxpl_id;
ex_info.file_mem_type = sh->file_mem_type;
ex_info.bt_free_addr = sh->bt_free_addr;
ex_info.max_extend_size = sh->max_extend_size;
ex_info.space_needed = size;
ex_info.loc = HADDR_UNDEF;
if(H5BT_iterate(f, dxpl_id, sh->bt_heap_addr, H5SH_alloc_extend_cb, &ex_info) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_NOTFOUND, FAIL, "can't iterate over heap blocks")
/* Check if we managed to extend a heap block */
if(H5F_addr_defined(ex_info.loc)) {
if(H5BT_insert(f, dxpl_id, sh->bt_heap_addr, ex_info.extend_addr, ex_info.extend_size) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "can't extend tracked block")
/* Set address to return */
*obj_addr_p = ex_info.loc;
} /* end if */
else {
haddr_t block_addr; /* Address of new heap block */
hsize_t block_size; /* Size of heap block */
/* Determine how large to make the heap block initially */
if(size <= sh->min_size)
block_size = sh->min_size;
else
block_size = size;
/* There's no internal or external space available, allocate a new heap block */
if(HADDR_UNDEF == (block_addr = H5MF_alloc(f, sh->file_mem_type, dxpl_id, sh->min_size)))
HGOTO_ERROR(H5E_HEAP, H5E_NOSPACE, FAIL, "failed to allocate space for new heap block")
/* Add heap block to tracker */
if(H5BT_insert(f, dxpl_id, sh->bt_heap_addr, block_addr, block_size) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "can't insert heap block")
/* Check if there is free space */
if(size < sh->min_size) {
/* Add free space to tracker */
if(H5BT_insert(f, dxpl_id, sh->bt_free_addr, block_addr + size, sh->min_size - size) < 0)
HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "can't insert free space")
} /* end if */
/* Set address to return */
*obj_addr_p = block_addr;
} /* end else */
} /* end else */
done:
/* Release the block tracker info */
if (sh && H5AC_unprotect(f, dxpl_id, H5AC_SGHP, addr, sh, H5AC__NO_FLAGS_SET) < 0)
HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release segmented heap info")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5SH_alloc() */
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