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/*-------------------------------------------------------------------------
* Copyright (C) 1997-2001 National Center for Supercomputing Applications
* All rights reserved.
*
*-------------------------------------------------------------------------
*
* Created: H5MF.c
* Jul 11 1997
* Robb Matzke <matzke@llnl.gov>
*
* Purpose: File memory management functions.
*
* Modifications:
* Robb Matzke, 5 Aug 1997
* Added calls to H5E.
*
* Robb Matzke, 8 Jun 1998
* Implemented a very simple free list which is not persistent and which
* is lossy.
*
*-------------------------------------------------------------------------
*/
#define H5F_PACKAGE /*suppress error about including H5Fpkg */
#include "H5private.h"
#include "H5Eprivate.h"
#include "H5Fpkg.h"
#include "H5FDprivate.h"
#include "H5MFprivate.h"
#define PABLO_MASK H5MF_mask
/* Is the interface initialized? */
static int interface_initialize_g = 0;
#define INTERFACE_INIT NULL
/*-------------------------------------------------------------------------
* Function: H5MF_alloc
*
* Purpose: Allocate SIZE bytes of file memory and return the relative
* address where that contiguous chunk of file memory exists.
* The TYPE argument describes the purpose for which the storage
* is being requested.
*
* Return: Success: The file address of new chunk.
*
* Failure: HADDR_UNDEF
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jul 11 1997
*
* Modifications:
* Robb Matzke, 1999-08-04
* Modified to work with the virtual file layer.
*-------------------------------------------------------------------------
*/
haddr_t
H5MF_alloc(H5F_t *f, H5FD_mem_t type, hsize_t size)
{
haddr_t ret_value=HADDR_UNDEF;
FUNC_ENTER_NOAPI(H5MF_alloc, HADDR_UNDEF);
/* check arguments */
assert(f);
assert(size > 0);
/* Fail if we don't have write access */
if (0==(f->intent & H5F_ACC_RDWR)) {
HRETURN_ERROR(H5E_RESOURCE, H5E_CANTINIT, HADDR_UNDEF, "file is read-only");
}
/* Allocate space from the virtual file layer */
if (HADDR_UNDEF==(ret_value=H5FD_alloc(f->shared->lf, type, size))) {
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, HADDR_UNDEF,
"file allocation failed");
}
/* Convert absolute file address to relative file address */
assert(ret_value>=f->shared->base_addr);
ret_value -= f->shared->base_addr;
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5MF_xfree
*
* Purpose: Frees part of a file, making that part of the file
* available for reuse.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Jul 17 1997
*
* Modifications:
* Robb Matzke, 1999-07-28
* The ADDR argument is passed by value
*
* Robb Matzke, 1999-08-03
* Modified to use the virtual file layer.
*-------------------------------------------------------------------------
*/
herr_t
H5MF_xfree(H5F_t *f, H5FD_mem_t type, haddr_t addr, hsize_t size)
{
FUNC_ENTER_NOAPI(H5MF_xfree, FAIL);
/* check arguments */
assert(f);
if (!H5F_addr_defined(addr) || 0 == size) {
HRETURN(SUCCEED);
}
assert(addr!=0);
/* Convert relative address to absolute address */
addr += f->shared->base_addr;
/* Allow virtual file layer to free block */
if (H5FD_free(f->shared->lf, type, addr, size)<0) {
#ifdef H5MF_DEBUG
if (H5DEBUG(MF)) {
fprintf(H5DEBUG(MF),
"H5MF_free: lost %lu bytes of file storage\n",
(unsigned long)size);
}
#endif
}
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5MF_realloc
*
* Purpose: Changes the size of an allocated chunk, possibly moving it to
* a new address. The chunk to change is at address OLD_ADDR
* and is exactly OLD_SIZE bytes (if these are H5F_ADDR_UNDEF
* and zero then this function acts like H5MF_alloc). The new
* size will be NEW_SIZE and its address is the return value (if
* NEW_SIZE is zero then this function acts like H5MF_free and
* an undefined address is returned).
*
* If the new size is less than the old size then the new
* address will be the same as the old address (except for the
* special case where the new size is zero).
*
* If the new size is more than the old size then most likely a
* new address will be returned. However, under certain
* circumstances the library may return the same address.
*
* Return: Success: The relative file address of the new block.
*
* Failure: HADDR_UNDEF
*
* Programmer: Robb Matzke
* Thursday, April 16, 1998
*
* Modifications:
* Robb Matzke, 1999-07-28
* The ORIG_ADDR is passed by value. The name of NEW_ADDR has
* been changed to NEW_ADDR_P
*
* Robb Matzke, 1999-08-04
* Modified to work with the virtual file layer.
*-------------------------------------------------------------------------
*/
haddr_t
H5MF_realloc(H5F_t *f, H5FD_mem_t type, haddr_t old_addr, hsize_t old_size,
hsize_t new_size)
{
haddr_t ret_value=HADDR_UNDEF;
FUNC_ENTER_NOAPI(H5MF_realloc, HADDR_UNDEF);
/* Convert old relative address to absolute address */
old_addr += f->shared->base_addr;
/* Reallocate memory from the virtual file layer */
ret_value = H5FD_realloc(f->shared->lf, type, old_addr, old_size,
new_size);
if (HADDR_UNDEF==ret_value) {
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, HADDR_UNDEF,
"unable to allocate new file memory");
}
/* Convert return value to relative address */
assert(ret_value>=f->shared->base_addr);
ret_value -= f->shared->base_addr;
FUNC_LEAVE(ret_value);
}
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