/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Copyright by The HDF Group.                                               *

 * 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 LICENSE file, which can be found at the root of the source code       *

 * distribution tree, or in https://www.hdfgroup.org/licenses.               *

 * If you do not have access to either file, you may request a copy from     *

 * help@hdfgroup.org.                                                        *

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*

 * Open object info algorithms.

 *

 * These are used to track the objects currently open in a file, for various

 * internal mechanisms which need to be aware of such things.

 *

 */

#define H5F_FRIEND /*suppress error about including H5Fpkg    */

#include "H5private.h"   /* Generic Functions                     */

#include "H5Eprivate.h"  /* Error handling          */

#include "H5Fpkg.h"      /* File access                           */

#include "H5FLprivate.h" /* Free lists                            */

#include "H5FOprivate.h" /* File objects                          */

#include "H5Oprivate.h"  /* Object headers          */

#include "H5SLprivate.h" /* Skip Lists                            */

/* Private typedefs */

/* Information about open objects in a file */

typedef struct H5FO_open_obj_t {

    haddr_t addr;    /* Address of object header for object */

    void   *obj;     /* Pointer to the object            */

    bool    deleted; /* Flag to indicate that the object was deleted from the file */

} H5FO_open_obj_t;

/* Information about counted objects in a file */

typedef struct H5FO_obj_count_t {

    haddr_t addr;  /* Address of object header for object */

    hsize_t count; /* Number of times object is opened */

} H5FO_obj_count_t;

/* Declare a free list to manage the H5FO_open_obj_t struct */

H5FL_DEFINE_STATIC(H5FO_open_obj_t);

/* Declare a free list to manage the H5FO_obj_count_t struct */

H5FL_DEFINE_STATIC(H5FO_obj_count_t);

/*--------------------------------------------------------------------------

 NAME

    H5FO_create

 PURPOSE

    Create an open object info set

 USAGE

    herr_t H5FO_create(f)

        H5F_t *f;       IN/OUT: File to create opened object info set for

 RETURNS

    Returns non-negative on success, negative on failure

 DESCRIPTION

    Create a new open object info set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_create(const H5F_t *f)

{

    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->shared);

    /* Create container used to store open object info */

    if ((f->shared->open_objs = H5SL_create(H5SL_TYPE_HADDR, NULL)) == NULL)

        HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to create open object container");

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_create() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_opened

 PURPOSE

    Checks if an object at an address is already open in the file.

 USAGE

    void * H5FO_opened(f,addr)

        const H5F_t *f;         IN: File to check opened object info set

        haddr_t addr;           IN: Address of object to check

 RETURNS

    Returns a pointer to the object on success, NULL on failure

 DESCRIPTION

    Check is an object at an address (the address of the object's object header)

    is already open in the file and return the ID for that object if it is open.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

void *

H5FO_opened(const H5F_t *f, haddr_t addr)

{

    H5FO_open_obj_t *open_obj;  /* Information about open object */

    void            *ret_value; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (open_obj = (H5FO_open_obj_t *)H5SL_search(f->shared->open_objs, &addr))) {

        ret_value = open_obj->obj;

        assert(ret_value != NULL);

    } /* end if */

    else

        ret_value = NULL;

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_opened() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_insert

 PURPOSE

    Insert a newly opened object/pointer pair into the opened object info set

 USAGE

    herr_t H5FO_insert(f,addr,obj,delete_flag)

        H5F_t *f;               IN/OUT: File's opened object info set

        haddr_t addr;           IN: Address of object to insert

        void *obj;              IN: Pointer to object to insert

        bool delete_flag;    IN: Whether to 'mark' this object for deletion

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Insert an object/ID pair into the opened object info set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_insert(const H5F_t *f, haddr_t addr, void *obj, bool delete_flag)

{

    H5FO_open_obj_t *open_obj;            /* Information about open object */

    herr_t           ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    assert(H5_addr_defined(addr));

    assert(obj);

    /* Allocate new opened object information structure */

    if ((open_obj = H5FL_MALLOC(H5FO_open_obj_t)) == NULL)

        HGOTO_ERROR(H5E_CACHE, H5E_NOSPACE, FAIL, "memory allocation failed");

    /* Assign information */

    open_obj->addr    = addr;

    open_obj->obj     = obj;

    open_obj->deleted = delete_flag;

    /* Insert into container */

    if (H5SL_insert(f->shared->open_objs, &open_obj->addr, open_obj) < 0)

        HGOTO_ERROR(H5E_CACHE, H5E_CANTINSERT, FAIL, "can't insert object into container");

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_insert() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_delete

 PURPOSE

    Remove an opened object/ID pair from the opened object info set

 USAGE

    herr_t H5FO_delete(f,addr)

        H5F_t *f;               IN/OUT: File's opened object info set

        haddr_t addr;           IN: Address of object to remove

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Remove an object/ID pair from the opened object info.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_delete(H5F_t *f, haddr_t addr)

{

    H5FO_open_obj_t *open_obj;            /* Information about open object */

    herr_t           ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    assert(H5_addr_defined(addr));

    /* Remove from container */

    if (NULL == (open_obj = (H5FO_open_obj_t *)H5SL_remove(f->shared->open_objs, &addr)))

        HGOTO_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "can't remove object from container");

    /* Check if the object was deleted from the file */

    if (open_obj->deleted) {

        if (H5O_delete(f, addr) < 0)

            HGOTO_ERROR(H5E_OHDR, H5E_CANTDELETE, FAIL, "can't delete object from file");

    } /* end if */

    /* Release the object information */

    open_obj = H5FL_FREE(H5FO_open_obj_t, open_obj);

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_delete() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_mark

 PURPOSE

    Mark an object to be deleted when it is closed

 USAGE

    herr_t H5FO_mark(f,addr,deleted)

        const H5F_t *f;         IN: File opened object is in

        haddr_t addr;           IN: Address of object to delete

        bool deleted;           IN: true for to be deleted

 RETURNS

    Returns a non-negative ID for the object on success, negative on failure

 DESCRIPTION

    Mark an opened object for deletion from the file when it is closed.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_mark(const H5F_t *f, haddr_t addr, bool deleted)

{

    H5FO_open_obj_t *open_obj;            /* Information about open object */

    herr_t           ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (open_obj = (H5FO_open_obj_t *)H5SL_search(f->shared->open_objs, &addr)))

        open_obj->deleted = deleted;

    else

        ret_value = FAIL;

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_mark() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_marked

 PURPOSE

    Check if an object is marked to be deleted when it is closed

 USAGE

    bool H5FO_marked(f,addr)

        const H5F_t *f;         IN: File opened object is in

        haddr_t addr;           IN: Address of object to delete

 RETURNS

    Returns a true/false on success

 DESCRIPTION

    Checks if the object is currently in the "opened objects" tree and

    whether its marks for deletion from the file when it is closed.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

bool

H5FO_marked(const H5F_t *f, haddr_t addr)

{

    H5FO_open_obj_t *open_obj;          /* Information about open object */

    bool             ret_value = false; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (open_obj = (H5FO_open_obj_t *)H5SL_search(f->shared->open_objs, &addr)))

        ret_value = open_obj->deleted;

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_marked() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_dest

 PURPOSE

    Destroy an open object info set

 USAGE

    herr_t H5FO_dest(f)

        H5F_t *f;               IN/OUT: File's opened object info set

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Destroy an existing open object info set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_dest(const H5F_t *f)

{

    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->shared);

    assert(f->shared->open_objs);

    /* Check if the object info set is empty */

    if (H5SL_count(f->shared->open_objs) != 0)

        HGOTO_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "objects still in open object info set");

    /* Release the open object info set container */

    if (H5SL_close(f->shared->open_objs) < 0)

        HGOTO_ERROR(H5E_CACHE, H5E_CANTCLOSEOBJ, FAIL, "can't close open object info set");

    f->shared->open_objs = NULL;

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_dest() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_top_create

 PURPOSE

    Create the "top" open object count set

 USAGE

    herr_t H5FO_top_create(f)

        H5F_t *f;       IN/OUT: File to create opened object count set for

 RETURNS

    Returns non-negative on success, negative on failure

 DESCRIPTION

    Create a new open object count set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_top_create(H5F_t *f)

{

    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    /* Create container used to store open object info */

    if ((f->obj_count = H5SL_create(H5SL_TYPE_HADDR, NULL)) == NULL)

        HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to create open object container");

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_top_create() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_top_incr

 PURPOSE

    Increment the "top" reference count for an object in a file

 USAGE

    herr_t H5FO_top_incr(f, addr)

        H5F_t *f;               IN/OUT: File's opened object info set

        haddr_t addr;           IN: Address of object to increment

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Increment the reference count for an object in the opened object count set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_top_incr(const H5F_t *f, haddr_t addr)

{

    H5FO_obj_count_t *obj_count;           /* Ref. count for object */

    herr_t            ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->obj_count);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (obj_count = (H5FO_obj_count_t *)H5SL_search(f->obj_count, &addr))) {

        (obj_count->count)++;

    } /* end if */

    else {

        /* Allocate new opened object information structure */

        if (NULL == (obj_count = H5FL_MALLOC(H5FO_obj_count_t)))

            HGOTO_ERROR(H5E_CACHE, H5E_NOSPACE, FAIL, "memory allocation failed");

        /* Assign information */

        obj_count->addr  = addr;

        obj_count->count = 1;

        /* Insert into container */

        if (H5SL_insert(f->obj_count, &obj_count->addr, obj_count) < 0)

            HGOTO_ERROR(H5E_CACHE, H5E_CANTINSERT, FAIL, "can't insert object into container");

    } /* end if */

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_top_incr() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_top_decr

 PURPOSE

    Decrement the "top" reference count for an object in a file

 USAGE

    herr_t H5FO_top_decr(f, addr)

        H5F_t *f;               IN/OUT: File's opened object info set

        haddr_t addr;           IN: Address of object to decrement

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Decrement the reference count for an object in the opened object count set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_top_decr(const H5F_t *f, haddr_t addr)

{

    H5FO_obj_count_t *obj_count;           /* Ref. count for object */

    herr_t            ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->obj_count);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (obj_count = (H5FO_obj_count_t *)H5SL_search(f->obj_count, &addr))) {

        /* Decrement the reference count for the object */

        (obj_count->count)--;

        if (obj_count->count == 0) {

            /* Remove from container */

            if (NULL == (obj_count = (H5FO_obj_count_t *)H5SL_remove(f->obj_count, &addr)))

                HGOTO_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "can't remove object from container");

            /* Release the object information */

            obj_count = H5FL_FREE(H5FO_obj_count_t, obj_count);

        } /* end if */

    }     /* end if */

    else

        HGOTO_ERROR(H5E_CACHE, H5E_NOTFOUND, FAIL, "can't decrement ref. count");

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_top_decr() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_top_count

 PURPOSE

    Return the "top" reference count for an object in a file

 USAGE

    hsize_t H5FO_top_count(f, addr)

        H5F_t *f;               IN/OUT: File's opened object info set

        haddr_t addr;           IN: Address of object to increment

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Retrieves the reference count for an object in the opened object count set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

hsize_t

H5FO_top_count(const H5F_t *f, haddr_t addr)

{

    H5FO_obj_count_t *obj_count; /* Ref. count for object */

    hsize_t           ret_value; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */

    assert(f);

    assert(f->obj_count);

    assert(H5_addr_defined(addr));

    /* Get the object node from the container */

    if (NULL != (obj_count = (H5FO_obj_count_t *)H5SL_search(f->obj_count, &addr)))

        ret_value = obj_count->count;

    else

        ret_value = 0;

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_top_count() */

/*--------------------------------------------------------------------------

 NAME

    H5FO_top_dest

 PURPOSE

    Destroy an open object info set

 USAGE

    herr_t H5FO_top_dest(f)

        H5F_t *f;               IN/OUT: File's opened object info set

 RETURNS

    Returns a non-negative on success, negative on failure

 DESCRIPTION

    Destroy an existing open object info set.

 GLOBAL VARIABLES

 COMMENTS, BUGS, ASSUMPTIONS

 EXAMPLES

 REVISION LOG

--------------------------------------------------------------------------*/

herr_t

H5FO_top_dest(H5F_t *f)

{

    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */

    assert(f);

    assert(f->obj_count);

    /* Check if the object count set is empty */

    if (H5SL_count(f->obj_count) != 0)

        HGOTO_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "objects still in open object info set");

    /* Release the open object count set container */

    if (H5SL_close(f->obj_count) < 0)

        HGOTO_ERROR(H5E_CACHE, H5E_CANTCLOSEOBJ, FAIL, "can't close open object info set");

    f->obj_count = NULL;

done:

    FUNC_LEAVE_NOAPI(ret_value)

} /* end H5FO_top_dest() */